2.1. Cases

To better motivate the epistemic significance of mind-changing, let’s consider a minimal pair involving disagreement. Return to the pragmatist dispute we started with, and compare two ways it could have developed:

More schematically, compare the following pair of cases:Footnote ¹

These cases are structurally similar – both involve ongoing disagreement – but differ critically in their belief trajectory. In Case 2, unlike Case 1, one party has changed their mind.

This difference in history matters epistemically. Ceteris paribus, Brisa should feel more pressure to reconsider her belief upon discovering she’s in Case 2 rather than Case 1. At the very least, I can report that I would – and many others share this intuition. Whether this judgment should ultimately be endorsed depends on further details, including the interlocutor, the strength of one’s independent evidence, and the nature of the shift. But all else equal, learning that someone has changed their mind seems to exert both psychological and epistemic force. Even if she maintains her belief, Brisa has a legitimate reason to worry that she’s missed something important.

The relevance of mind-changes extends to practical disagreements as well. Consider a value-based case:

Intuitively, Alicia’s change of mind will have more persuasive force than her steady-state conviction. If I were Bella, I would be more inclined to take Alicia more seriously in the second case than in the first. But why? The question becomes more urgent when we recognize that, in both cases, Alicia currently holds the same view. The difference lies solely in the history of her belief.

The idea that others’ intellectual biographies matter to us is familiar from everyday life. When someone offers advice you’re reluctant to follow, discovering that they once shared your doubts can make their counsel more compelling. A woman hesitant to try strength training may be reassured to learn that others shared her concerns about “bulking up” but revised their views in light of experience and research. A student wary of taking on extracurricular commitments, fearing disrupting their studies, might be more receptive to a mentor’s advice upon finding out the mentor overcame similar skepticism. A scholar unsure whether reading beyond their area is worthwhile may be influenced by learning that others once shared that skepticism, but later came to appreciate the value of broader engagement. In each case, what lends the advice additional force is not just its substance, but the biographical arc behind it.

But why does this pressure arise? What exactly do we learn when we learn that others changed their minds?

2.2. Understanding changes of mind

To understand why others’ changes of mind can be epistemically significant, we must first clarify what constitutes a genuine change of mind in the first place. Just as losing knowledge is not necessarily forgetting, not all changes in belief count as changes of mind. As Daniel Dennett puts it, “Losing is not discarding, and forgetting is not changing one’s mind, but it is a way of divesting oneself of an opinion” (Dennett Reference Dennett2017, 308). Clarifying what it means to change your mind is important, for my central claim is that changes of mind – not just any belief-change – can be epistemically significant.

Following Annette Baier, Dennett emphasizes that a change of mind is a particular kind of cognitive transition, involving reflective self-correction. Bumping your head may alter your beliefs, but it doesn’t amount to changing your mind. Genuine mind-changes require the exercise of agency in revising one’s judgment. Following Baier, we can say that a “change of mind $ \ldots $ is a matter of having second thoughts which are revised judgments, revised to correct faults of judgment” (Baier Reference Baier1979, 168). The central idea is that a change of mind is a kind of double-check on our beliefs, designed to fix previous faults and failures: “what we judge two times is sound” (Baier Reference Baier1979, 168).

This account partly explains the significance of learning about changes of mind. When we change our minds, we typically bring to bear all the initial considerations and then some. We fix errors in our previous reasoning and adjust in light of new information. In other words, there is a close connection between changes of mind and epistemic improvement. This point is not merely conceptual; it also enjoys empirical support, with studies revealing that “changes of mind often improve task performance by correcting initial errors” (Stone et al. Reference Stone, Mattingley and Rangelov2022, 419). Thus, if you hold a particular belief while someone else arrives at a different conclusion after revising their own stance, you have reason to take their view more seriously. A genuine change of mind indicates that the agent devoted more time or attention to the issue, potentially incorporated new evidence, or improved their response to existing evidence.

This connection between mind-changing and epistemic improvement helps explain why dynamic disagreements seem more epistemically compelling than static ones. When Brisa learns that Alex used to share her misgivings about pragmatism but now advocates for it, she can reasonably assume that Alex experienced a genuine change of mind in two senses. First, he truly underwent a change of mind, not just a change in belief: he initially formed one judgment, then self-consciously revised it. Second, unless she is unusually cynical, she can assume he isn’t just pretending to have changed his mind to manipulate her trust – he actually experienced the shift. (Indeed, part of what I’m trying to explain is why such misreporting would be rhetorically effective in the first place!) My central claim is this: once Brisa learns that Alex has genuinely changed his mind, she learns that he has earned a kind of epistemic credential. A change of mind signals epistemic improvement along some dimensions.

Changes of mind not only indicate good epistemic hygiene but also reflect epistemic virtue, even if they’re not definitive proof of it. The willingness to revise one’s beliefs signals open-mindedness and rejection of dogmatism. Mind-changers sidestep criticisms of status quo bias or genealogical inertia: they clearly don’t hold their views simply because they were raised to endorse them. They also avoid one source of epistemic criticism that many of us are guilty of: namely, that they failed to properly consider or entertain an alternative view.

Of course, not all changes of mind signify epistemic improvement or virtue. Changes can be unreflective, the result of indoctrination, or even lead to the adoption of a more close-minded and intolerant position (DiPaolo Reference DiPaolo2020). My claim is that changes of mind can serve as a valuable proxy for good belief-forming practices. However, we need to investigate further to be certain.

Beyond epistemic virtue, Matthew Shields has recently argued that changing one’s mind – especially when it involves personal cost – is among the strongest indicators of a genuine commitment to epistemic goods like truth, knowledge, and understanding. As he explains, “This is because changing one’s mind in this way goes as far as we can in eliminating the possibility that the agent has an ulterior motivation for their epistemic practices” (Shields Reference Shields2025, 1). Belief revision can be psychologically distressing, often inducing cognitive dissonance: admitting we were wrong is painful.Footnote ² It can also carry reputational and social costs, even in domains that reputedly prize truth over consistency. Consider, for instance, Hilary Putnam’s frequent shifts in perspective, which earned him the playful but somewhat dismissive label of a flip-flopper. As one memoriam reported, “His changes of opinion were so notorious that the satirical Philosophical Lexicon coined a unit of intellectual time in his honor, the ‘hilary’. (As in: ‘Oh, that’s what I thought three or four hilaries ago’.)” (Pershan Reference Pershan2016). Yet for Putnam, this willingness to revise reflected a deeper ideal. Praising his role model Carnap, he wrote that such a stance exemplified a commitment to placing “the search for truth higher than personal vanity” (Putnam Reference Putnam1988, xii). The epistemic role of cost – both psychological and social – takes center stage in ${\rm{\S}}$ 4.3.

To summarize, once we know what a change of mind is – and its intimate connection to epistemic improvement, virtue, and commitment – we can begin to appreciate why learning that others changed their minds holds epistemic promise for us. These relationships help explain why dynamic cases are more significant than static ones and hence why Brisa and Bella should be especially inclined to defer to Alex and Alicia upon learning that the latter changed their minds.

2.3. Epistemic standing and superiority

In effect, I’m claiming that when you learn that someone changed their mind, you acquire defeasible evidence that they are plausibly an epistemic superior along some dimensions. This matters because the philosophical literature on disagreement focuses primarily on static disagreement between epistemic peers: those who are “roughly equal in intelligence, reasoning ability, and background knowledge” (Feldman Reference Feldman and Antony2010, 201). While it’s debated whether peer disagreement should prompt belief revision, it’s relatively uncontroversial that recognized epistemic superiors warrant deference.

Yet determining whether someone counts as an epistemic superior – or even a peer – is often difficult. The literature highlights a range of factors relevant to assessing comparative epistemic standing (Frances & Matheson Reference Frances, Matheson, Zalta and Nodelman2024). These include:

1. (a) evidence brought to bear;

2. (b) pertinent background knowledge;

3. (c) relevant cognitive abilities;

4. (d) time and attention;

5. (e) intellectual virtues and biases.

Assessing our standing on any of these metrics – let alone how they combine – is often practically challenging. However, changes of mind can offer a clue. Specifically, they can function as meta-level indicators of potential epistemic superiority along several dimensions. Genuine changes of mind signal that the agent may have:

1. 1. Epistemically improved – having incorporated more evidence, corrected errors, or refined their reasoning (dimensions a, c)

2. 2. Exhibited greater epistemic engagement – having devoted greater time and sustained attention to the issue (dimension d)

3. 3. Demonstrated epistemic virtue – displaying open-mindedness, intellectual humility, and responsiveness to reasons (dimension e)

4. 4. Avoided biases – such as genealogical inertia or dogmatism (dimension e)

This is not to say that mind-changers are automatically epistemic superiors. A change of mind provides defeasible evidence of superiority along specific dimensions, such as attentiveness, open-mindedness, or responsiveness to evidence. However, this evidence can be outweighed or rebutted by other considerations. For example, you might score higher on any of these metrics, for instance by possessing greater background knowledge, stronger reasoning skills, or more extensive evidence. All things considered, you may be epistemically equal or even superior to your interlocutor. While a mind-change can contribute to someone’s overall epistemic standing, it does not single-handedly determine it. Alternatively, you may have reason to dismiss your interlocutor’s change as epistemically irrelevant – an option I explore in §4. Still, absent defeaters, learning that someone has genuinely changed their mind should carry epistemic weight.

2.4. Empathy and shared starting points

The connection between mind-changing and epistemic superiority suggests that whenever you learn someone has genuinely changed their mind, you have a defeasible reason to take their new position especially seriously. A genuine change of mind signals engagement, reflection, and responsiveness to reasons – qualities that tend to enhance epistemic standing regardless of respective starting points. Still, learning that someone who now disagrees with you once shared your original view often feels especially significant. As the phenomenon dubbed the “narcissism of small differences” illustrates, it’s often the shift of a former ally – not the steadfast opposition of a critic – that triggers the sharpest discomfort and self-doubt.Footnote ³ This reaction isn’t merely psychological. Cases of disagreement involving shared starting points often carry unique epistemic significance for several reasons.

First, learning that someone used to share our view can shift how we assess their epistemic standing. Often, when we disagree with someone, we suspect – justifiably or not – that they haven’t fully appreciated the reasons we find persuasive, or that they’re operating from incompatible background commitments. (Think of a relativist student who has not yet appreciated the arguments against it, or a disagreement over abortion shaped by deep value differences.) But when we discover that someone once held our belief and then gave it up, we can rule out at least some of these explanations. Their trajectory eliminates certain defeaters: it shows they understand the reasons we find convincing and rejected them anyway. That can prompt us to reclassify them as someone who began as an epistemic peer and is now plausibly a superior. Their change of mind doesn’t just suggest that further evidence may exist – it suggests that such evidence is likely to be accessible and weighty for someone like us.Footnote ⁴

Second, this observation complicates permissivist responses to disagreement.Footnote ⁵ If permissivism is true, then disagreement needn’t pressure us to revise our beliefs, as there may be multiple rational responses to the same body of evidence. We can explain away epistemic divergence by saying, “We’re both rational – we just weigh the evidence differently.” But when someone moves away from our view after sharing it, this explanation becomes harder to sustain. Their divergence isn’t merely due to different priors or evaluative standards; it reflects a revision within our own framework. That trajectory raises the possibility that, if we extended our own reasoning further, we might arrive at the same conclusion.

Third, this shared history of agreement suggests that the mind-changer can empathize with our perspective. They can understand our reasons, share our evaluative framework, recognize our values, and appreciate our perspective from the inside. Their disagreement is thus more powerful than disagreement from someone who never occupied our position.Footnote ⁶ They may even be willing to help guide you through the same process of reconsideration.

These factors make psychological deflection more difficult. When disagreement arises from someone who never shared our view, we can more easily attribute the disagreement to fundamentally different starting points, values, or background beliefs. But when someone shifts from agreement to disagreement, that reassurance becomes harder to maintain. We’re forced to confront the possibility that the source of divergence lies not in their unfamiliarity with our reasons, but in the inadequacy of those reasons themselves.

While the epistemic significance of mind-changes is especially strong when they begin from shared starting points, they can exert epistemic pressure in other cases, too. Suppose Brisa initially suspended judgment about pragmatism while Alex affirmed it. Learning that Alex later changed his mind after deeper reflection still gives Brisa a defeasible reason to take his revised view more seriously. Conversely, when someone who once disagreed with you comes to share your belief, their shift can lend epistemic support by suggesting that your view has withstood critical scrutiny. A mind-change in your direction implies that careful reflection favors your position, reinforcing your confidence and corroborating your belief. (For instance, if an internalist reflects and ultimately adopts your externalist view, their trajectory may increase your confidence.) That said, such support may carry less weight if the reasons that moved them were already reflected in your own belief formation.Footnote ⁷

2.5. Explaining the epistemic impact

We’ve now seen why mind-changes often feel epistemically significant, especially when they come from someone who once shared our view. We’re now in a position to answer the puzzle we started with: why do such changes seem epistemically significant, even when they don’t supply new first-order evidence? I propose that learning about someone’s change of mind can provide three interrelated epistemic resources: (1) higher-order evidence about the reliability of one’s reasoning, (2) reasons to reopen inquiry, and (3) evidence that further first-order evidence may be available. Together, these explain how mind-changes can exert rational pressure even when no new arguments are offered.

First, changes of mind provide higher-order evidence: evidence concerning the reliability of reasoning or belief-forming processes, rather than direct evidence about the proposition in question. Higher-order evidence concerns facts about one’s epistemic performance or rational capacities, sometimes undermining confidence even when first-order evidence remains unchanged (Horowitz Reference Horowitz, Zalta and Nodelman2025). When you learn that someone changed their mind while yours remained static, you gain reason to think they’re epistemically superior along some dimensions. As we’ve seen, this higher-order evidence can be especially compelling when the mind-changer previously occupied your current epistemic position.

Second, learning about changes of mind supplies zetetic reasons: reasons to reopen or continue inquiry, reassess evidence, and reconsider one’s beliefs with renewed open-mindedness. Higher-order evidence often gives us reason to investigate further (Palmira Reference Palmira2023; Staffel Reference Staffel2023; Yarandi Reference Yarandi2023), though the connection may not be automatic (Falbo Reference Falbo, Creller and Mathesonforthcoming). Learning about a mind-change typically creates a rational incentive to re-examine the issue at hand, especially when the agent cares about it and thinks she can improve her thinking, too. Moreover, the agent has reason to inquire not only into the first-order question at issue but also into the credibility of the higher-order evidence itself – for example, by examining whether the change of mind was genuine and driven by epistemic considerations, a diagnostic process I explore more fully in §4.

Finally, learning that someone has changed their mind often provides evidence that further evidence exists – evidence we may not yet have encountered or properly assessed.Footnote ⁸ Even without knowing precisely what motivated the shift, the mere fact of reflection and revision gives us a defeasible reason to suspect that additional support for their new belief may be available. Importantly, this evidence has a proleptic character: it does not directly support the proposition in question, but rather signals that such support might be found. That makes mind-change cases different from standard appeals to expert testimony, where the superior’s endorsement can itself justify belief revision. Here, the appropriate response is more tentative and investigatory. A change of mind suggests the person may have epistemic advantages: it marks them as a possible superior, not a recognized one. However, this evidence is quite defeasible, and further inquiry is needed to determine whether that status is warranted.

To see how these components interact, return to the dynamic dispute over pragmatism. Learning that Alex changed his mind gives Brisa no new first-order evidence for pragmatism. Nonetheless, she acquires two forms of second-order evidence: evidence bearing on her epistemic position without bearing on the content of the belief itself. First, she gains higher-order evidence: reason to question the reliability of her original reasoning, at least relative to Alex’s. If Alex has revisited the issue, corrected earlier mistakes, and refined his judgment, it is reasonable for Brisa to suspect that his belief is better formed. Second, she may receive evidence of evidence: reason to think there may be further relevant considerations she has not yet encountered or properly assessed. Second-order evidence affords her zetetic reason to inquire further – not only to re-examine her evidence and reasoning but also to evaluate whether Alex truly qualifies as an epistemic superior. And should she come to grasp the reasons behind Alex’s shift, these reasons may provide first-order evidence for pragmatism and furnish direct grounds for changing her mind, too.

This dynamic helps resolve the puzzle initially introduced. Learning that someone has changed their mind does more than inform us of their current belief: it provides defeasible evidence that their cognitive trajectory involved epistemic improvement. That evidence may be overridden; for example, Alex might have changed his mind hastily or for poor reasons. But absent strong defeaters, the rational response is not necessarily to defer automatically but to reflect anew. Even if we don’t yet know why they changed their mind, the fact that they did gives us reason to take a second look, too.

So far, I’ve focused on changes of mind encountered through direct interpersonal exchanges. But what happens when we learn about such changes from a distance, such as through reports and trends? While many of the same epistemic dynamics persist, these cases also introduce distinctive challenges of interpretation, requiring greater care in assessing when a belief shift is epistemically significant – and when it is not. I turn to these cases next.

3.1. Individual reports at a distance

Public figures often offer narrative accounts of their intellectual transformations. To see how these accounts might inform our epistemic outlook, consider the intellectual trajectories of two prominent philosophers: Hilary Putnam and Philip Kitcher. Both initially dismissed pragmatism as philosophically inadequate, only to later champion it as among the most significant contributions to philosophy. Putnam, once a staunch realist and critic of pragmatism, famously reinvented himself as one of its most enthusiastic advocates. Kitcher, who once described pragmatists as “well-intentioned but benighted, laboring with crude tools,” later ranked pragmatism alongside Kant’s work in terms of its philosophical significance (Kitcher Reference Kitcher2012, xi).

Even without direct engagement, such changes of mind can exert epistemic pressure. When a thinker with a long track record of serious engagement revises their position, we may reasonably treat that shift as epistemically meaningful, especially provided certain conditions are met. Several factors contribute to the strength of the epistemic signal. First, there is no apparent incentive for fabrication: neither Putnam nor Kitcher stood to benefit professionally or socially from falsely reporting a change of view. Second, both offered detailed, reflective accounts of their reasons, helping us assess whether the shift was epistemically motivated. Third, their reputations as careful, responsible philosophers lend additional weight to their revisions. Finally, the context matters: if pragmatism was marginalized when they embraced it, their change carries more evidential weight, since it is less likely to reflect conformity or opportunism.

Consider how these factors apply specifically to Putnam’s case. Suppose you share his early criticisms of pragmatism. Learning that he later revised his stance after decades of philosophical work furnishes you with higher-order evidence, suggesting your own view might merit reconsideration. It also supplies a zetetic reason to reopen inquiry: to ask what considerations might have led a serious thinker to change his mind. Even before learning about his reasons, you gain evidence that there are more arguments available supporting pragmatism. The fact that Putnam offered detailed explanations, situated his change within a broader intellectual trajectory, maintained a strong reputation for epistemic responsibility, and made the shift despite potential professional costs all enhance the epistemic significance of his revision.

3.2. Patterns of migration

While individual reports of mind-change are often epistemically significant, they can also reveal broader patterns. Sometimes, belief revisions are not isolated events but part of a larger migration from one position to another. Asymmetric epistemic migration occurs when movement flows predominantly in one direction, with significantly more individuals shifting from view A to view B. Such patterns naturally prompt the question, famously posed to Arcesilaus: Why is the migration so one-sided? Although these trends may seem more epistemically compelling by virtue of their scale, they also intensify the interpretive challenge. When do such shifts reflect genuine epistemic progress, and when are they better explained by non-epistemic pressures that encourage convergence irrespective of truth?

To illustrate the phenomenon, consider again pragmatism. Suppose you discover that Putnam and Kitcher were not unique: many philosophers who initially dismissed pragmatism eventually came to embrace it, while few moved in the opposite direction. This asymmetric migration could offer defeasible evidence that pragmatism withstands critical scrutiny over time. Deeper engagement with philosophical problems may push thinkers toward the pragmatist camp. A similar thought animated Berkeley and Butler’s defense of Christianity and even surfaced in worries about the disproportionate appeal of Epicureanism in antiquity.

Nonetheless, not all trends are epistemically meaningful. Migration patterns may be shaped by factors unrelated to truth-tracking: institutional incentives, professional conformity, reputational pressures, or broader cultural fashions. Belief shifts can reflect convenience as much as conviction.

Contemporary examples from the popular imagination illustrate this point:

1. (i) Religious belief appears to have decreased over time, though some individuals may convert on their deathbed.

2. (ii) A common refrain holds that individuals tend to become more conservative as they age.

3. (iii) Academic Marxism appears to have declined, perhaps with many former adherents transitioning to Rawlsian liberalism.Footnote ⁹

4. (iv) In the United States, a growing backlash against DEI initiatives has recently emerged across political and educational institutions.

These examples depict what asymmetric epistemic migration might look like, but not all are even prima facie epistemically significant. To determine whether these patterns reflect genuine epistemic progress, we need to ask critical questions regarding the genuineness of the change and the motivations undergirding it. I turn to this task next.

4.1. Assessing genuineness

The first diagnostic task is to determine whether a reported shift reflects a genuine change of mind. This task is relatively tractable in direct interpersonal exchanges, but grows more difficult in impersonal cases and group trends.

When groups appear to shift en masse, proponents of the new position may have become more vocal, while dissenters have grown silent or less influential. What looks like a shift may be better explained as a change in reporting norms. For instance, the recent surge of public opposition to DEI may partly reflect a preference cascade: individuals who already harbored skeptical views feel newly empowered to express them once the social costs decline. In such cases, public opinion hasn’t really changed; instead, what people feel entitled to express has.Footnote ¹⁰ That said, preference cascades can themselves prompt genuine reconsideration among some agents, shifting the Overton window and opening space for genuine belief revision. For example, questioning DEI policies, previously unthinkable among liberals, may become a topic open for reflection and potentially changing one’s mind.Footnote ¹¹ Moreover, some migratory trends arguably do reflect genuine changes in belief, not merely changes in expression; consider, for instance, shifts in public support for same-sex marriage.

At the individual level, there are also risks of strategic misreporting. For example, during the 2025 U.S. confirmation hearings, several controversial nominees – including Tulsi Gabbard, Robert F. Kennedy Jr., and Pete Hegseth – abruptly reversed prior positions in ways that seemed tailored to secure Senate votes (Axios 2025). Gabbard, long suspicious of Section 702 surveillance authorities, suddenly endorsed the program; Kennedy, a longtime critic of vaccines, proclaimed his support for the polio vaccine; and Hegseth, once opposed to women in combat roles, affirmed his support for their service (Axios 2025). These cases vividly illustrate how reported belief changes can reflect reputational or strategic pressures rather than epistemic reevaluation.

Even sincere reports may call for careful interpretation. Psychological research suggests that individuals often confabulate rational narratives to explain what were actually emotionally or socially driven shifts (Stammers & Bortolotti Reference Stammers and Bortolotti2020). As Julian Barnes observes in his reflective essay series, Changing My Mind, memory is not like a left-luggage office that returns neatly preserved experiences when we present the right claim ticket. Instead, remembering is a process of continual reinvention: “We constantly reinvent our lives, retelling them – usually – to our own advantage” (Barnes Reference Barnes2025, 11). Each time we recall a past event, we subtly reshape it. So too, when individuals recount the story of a mind-changing event, they may unconsciously reshape what they believed, or whether they ever truly held the prior view at all. As Barnes wryly notes, “We always believe that changing our mind is an improvement… It seems to make us stronger and more mature; we have put away yet another childish thing. Well, we would think that, wouldn’t we?” (Barnes Reference Barnes2025, 4). We reconstruct a narrative of progress, potentially obscuring the real motives and reasons behind our belief shift.

In some cases, what appears to be a change of mind is better understood as a mischaracterization of one’s earlier attitude. As Ian Leslie reflects, people often mistake emotional reactions for considered positions:

Leslie’s example illustrates an important point emphasized by Baier: to change your mind, you must first have made up your mind (Baier Reference Baier1979, 161). A genuine change of mind requires an initial commitment: an act of judgment that can later be revisited or revised. Where no clear belief was held, there is no real mind-change to report.

Together, these examples illustrate the fragility of mind-change reports. Without critical scrutiny, we risk mistaking changes in expression, framing, or social allegiance for genuine reconsideration of belief. While these risks are lower in cases of sincere reports, they are not eliminated.

4.2. Epistemic versus non-epistemic reasons

Even when a genuine change of mind occurs, we must ask whether it was epistemically motivated. As Simone Weil cautions, “Ideas are changeable; they are influenced by the passions, by fancy, by fatigue” (Weil Reference Weil2003, 62). The Dadaist Francis Picabia put it more playfully: “Our heads are round so that our thoughts can change direction.”Footnote ¹² These remarks suggest a more temperamental or instinctive explanation for belief revision than the well-known line: “When the facts change, I change my mind.”Footnote ¹³ Not all mind-changes reflect careful reconsideration in light of new evidence; some are driven by mood, social pressure, or convenience.

Consider again the idea that people tend to grow more conservative with age. This could reflect accumulated wisdom; but it could equally reflect changing material interests, decreased appetite for change, or comfort with stability. As Barnes catalogues:

Of these explanations, only the third might plausibly reflect epistemic reconsideration; the others reflect convenience or complacency.

Changing one’s mind can also be socially, not just personally, incentivized. When a group collectively shifts its views on issues like DEI or Marxism, individuals often face social pressure to conform. Some may only appear to change their minds for social or professional gain; others may genuinely undergo a transformation. Some may even “fake it until they make it,” initially performing acceptance before internalizing the new view.

In other cases, people shift their views alongside changes in their personal or social incentives and later reconstruct reasons to justify the change. Here, the risk of confabulation re-emerges: individuals may retrospectively invent epistemic reasons for a shift that was in fact driven by non-epistemic factors. Even when someone’s mind has changed for practical reasons, they may cite epistemic considerations instead. This makes it especially difficult to assess whether a reported change of mind is genuinely epistemically motivated, since we cannot fully trust people’s stated explanations.

Finally, emotional experiences can transform a person’s perspective without altering their evaluation of reasons. As Barnes observes, “We change our minds about many things… Love, parenthood, the death of those close to us: such matters reorient our lives, and often make us change our minds” (Barnes Reference Barnes2025, 5). In such cases, it is not that the facts have changed, but that new aspects of the world – emotional, experiential, and existential – come into view. Evaluating the epistemic significance of these cases is a delicate matter. On the one hand, learning that a change was motivated by practical or affective considerations is often a reason to discount the change. On the other hand, practical changes and emotional experiences can justifiably shift which considerations one finds salient and intelligible, enabling one to respond to genuine reasons they had previously overlooked. Assessing how epistemic and practical considerations interact in prompting a change of mind is ultimately crucial for evaluating its significance; it remains a task for further inquiry.

4.3. Costs and benefits

Given these challenges, how can we assess whether someone genuinely changed their minds for epistemic reasons? One important diagnostic tool is to examine the costs and benefits associated with retaining or changing one’s beliefs versus merely appearing to do so. The basic idea is this: mind-changes that come with costs are more likely to reflect genuine epistemic engagement; those that yield benefits are more suspect.

Hence, we should ask: did the agent have incentives to misreport a change, or to switch sides for non-epistemic reasons? For instance, mass conversions to a religion are less epistemically significant if they occurred under coercion or threat of death. Similarly, when adopting a new view brings professional advancement, social approval, or other extrinsic rewards, we should be cautious about treating the migration as epistemically meaningful. Suspiciously convenient shifts invite special scrutiny. The costs of re-entry apply too: if it’s costly to switch back, then the fact that someone stayed in their new position is less probative.

Broadly, we can distinguish between two types of cases:

We’ve already seen cases of the former: for instance, the tendency for individuals to become more conservative as they age may reflect growing material interests. To illustrate the latter, recall Berkeley and Butler’s contention that conversion to Christianity was especially evidentially weighty when it involved great personal sacrifice. Similarly, if pragmatism was unfashionable or marginalized in mid-twentieth-century philosophy, then Kitcher’s and Putnam’s later embrace of it carries greater epistemic force. Furthermore, if changing one’s mind is often costly – as Shields suggests – then it’s an even stronger signal. Interestingly, this may complicate any revisionary proposals for our intellectual practices. On the one hand, the epistemic value of mind-changing might suggest that we should reduce the social costs of changing one’s mind, so that more people feel comfortable doing so. On the other hand, part of what makes mind-changes so epistemically powerful is precisely that they are often costly.

Of course, not all costly belief changes are epistemically sound, just as not all convenient beliefs are misguided. Consider cases where someone joins a cult or adopts a fringe ideology: the shift may involve genuine and striking social and material costs, yet still be epistemically suspect. In such cases, the apparent costs may be outweighed by subjective or affective benefits that render the change attractive from the agent’s perspective.Footnote ¹⁴ These examples underscore two points. First, cost alone is an unreliable indicator of epistemic improvement. Second, evaluating costs and benefits requires attending to how the agent themselves encodes and experiences those trade-offs, not just how they appear from the outside.

These cost-benefit considerations apply across both interpersonal and impersonal contexts. However, they are especially crucial in evaluating broad migratory patterns, where direct access to individuals’ reasons is minimal. To fully assess the epistemic import of changes of mind, we must engage in psychological and sociological inquiry, paying close attention to the possibility of non-epistemic contamination.

4.4. Further tools

Our assessment of authenticity, motivation, and costs connects to the dimensions of epistemic standing introduced in ${\rm{\S}}$ 2.3. By examining these connections, we can identify several additional factors that help determine when changes of mind should exert epistemic pressure.

One factor is evidential independence. When multiple individuals independently revise similar beliefs – especially those from different backgrounds or methodological approaches – this convergence provides more substantial evidence for the revised position than do causally connected changes. Independent convergence suggests that the destination position better accommodates the total body of evidence, while changes spreading through social networks are more likely to reflect preference cascades than epistemic improvement.

Second, the domain-specific expertise of the mind-changer matters. Changes of mind carry more weight when they occur in domains where the agent possesses relevant background knowledge and where methodologies for evaluating evidence are robust. Putnam changing his mind about pragmatism after decades of philosophical engagement carries more epistemic significance than if he had revised views in areas where he lacked specialized knowledge. By contrast, when novice philosophy students move from untutored moral realism to moral relativism, the shift carries little weight; indeed, with further training, they are likely to revise their views again to a more sophisticated position.

Third, when available, we should consider the mind-changer’s track record. Suppose someone has a history of moving from true beliefs to false ones, or of shifting views erratically without discernible improvement. In that case, their changes warrant significantly less epistemic weight.Footnote ¹⁵ Frequent reversals might reflect fickleness, not intellectual virtue (DiPaolo Reference DiPaolo2018; Woodard Reference Woodard2020). At the same time, part of what makes mind-changing so attractive as a heuristic is that we often lack independent access to the truth of the target belief. In such cases, changes of mind function as valuable meta-indicators, especially in the absence of more direct means of assessing reliability.

Lastly, to assess the epistemic significance of someone else’s mind-change, we must also reflect on our own position. We may possess epistemic advantages they lack, such as broader evidence, more reliable methods, or sharper reasoning skills. We may even have engaged in our own reconsideration process only to reaffirm our initial beliefs – much like A. J. Ayer, who reportedly said, “My second thoughts on existentialism are the same as my first.”Footnote ¹⁶ Genuine reconsideration, not merely changing one’s mind, matters. Moreover, changes that persist through continued engagement often deserve more epistemic weight than transient shifts, insofar as this suggests they are resistant to counter-evidence and withstand critical engagement. At the same time, reaffirming a belief is not the same as adequately scrutinizing it. Without serious reflection, reaffirmation risks entrenching dogmatism under the guise of intellectual stability. Even if we stand by our original view, we should often remain alert to the possibility that we’ve overlooked something.

These additional dimensions complement earlier considerations of authenticity, motivation, and costs versus benefits. Though they may not exhaust the epistemic landscape, together they help us navigate the complex terrain of mind-changing evidence, distinguishing epistemically valuable signals from misleading noise. While learning that someone changed their mind doesn’t automatically provide direct first-order evidence, it can supply valuable epistemic resources: higher-order evidence about the reliability of belief-forming processes, zetetic reasons to investigate further, and evidence that more evidence exists. When carefully assessed using the framework developed in this paper, changes of mind can serve not merely as psychological curiosities but as valuable guides for improving our beliefs and navigating complex issues.