Bilingual speakers have been found to outperform monolingual speakers in tasks which involve taking others’ perspectives. This research examined whether bilingualism improves young adults’ performance on visuospatial perspective-taking (VPT) tasks, independently of culture and executive function (EF). Sixty-three East Asian and 61 European bilingual adults, as well as 60 English monolingual adults took part in level-1 VPT tasks (judging what others can see), level-2 VPT tasks (judging how others can see something) and EF tasks. They also filled in questionnaires about their social and language background, cultural orientation and acculturation. Groups did not differ in terms of VPT, suggesting that adult VPT is not affected by bilingualism or cultural orientation. Hierarchical regression revealed that VPT performance was predicted by EF skills, but not by individual differences in bilingualism or culture.

The Social Brain Hypothesis (SBH) connects primate brain size to social complexity but faces empirical limitations. We propose expanding the SBH by incorporating hippocampal functions across species, demonstrating how cognition emerges from both social and ecological pressures. This extended framework moves beyond cortical-centric models, providing a comprehensive understanding of brain evolution and the origins of human cognitive abilities, including language.

Life history strategies adaptively calibrated to levels of environmental harshness and unpredictability shape not only the fundamental issue of fertility but also whether and to what extent people engage in the structural, behavioral, and cognitive solutions proposed by Dunbar. Considering behavioral ecology can, therefore, add nuance to Dunbar’s novel and important theory.

Grooming and cognition support primate group cohesion but are insufficient for maintaining stability in large groups. We propose tolerance, the capacity to accommodate social stress, as an additional mechanism. Tolerance fosters flexible social skills and cooperation beyond small cliques. Shaped by hormonal adaptation and development, tolerance plays a foundational role in overcoming group size limits by sustaining complex social networks.

Dunbar suggests that social stressors set “glass ceilings” on the evolution of mammalian group size and cohesion. We argue that this glass ceiling narrative conceals three contentious anthropocentric assumptions. First, large stable groups would always be beneficial. Second, grooming is an indicator for maintaining group cohesion. Third, group size is primarily limited by cognitive or behavioral incapacity. We challenge all three assumptions.

Dunbar’s emphasis on dyadic relationships in group formation overlooks the roles of interdependence and joint commitment in social cohesion. We challenge his premise by highlighting the importance of group-level processes, particularly where top-down group pressures like cooperative breeding and out-group threat can induce joint commitment as an alternate means to sustain group cohesion.

I first summarise the argument in the target article so as to make the main points clear. I then address a number of major misunderstandings (mainly in relation to the social brain hypothesis), consider some specific issues that require clarification, and finally identify points that would merit more detailed consideration. I conclude with a list of possible future projects.

As the third solution to group dispersion, Dunbar proposes primates use several higher order cognitive skills to especially manage ‘weak ties’ in a nuanced and fast-tracked way, therewith avoiding unnecessary conflicts. We here argue that subconscious, automatic processes including attention allocation and behavioral or neurophysiological state matching can serve a similar function in maintaining group cohesion.

Dunbar proposes strategies to solve the fragmentation problem experienced by group-living animals. We highlight that bondedness not only mitigates stress but also provides structural scaffolding for group stability. Furthermore, we posit tolerance as a complementary mechanism smoothing social interactions and argue that variation in cohesion-promoting traits reflects context-dependent socio-ecological pressures, challenging static models linking sociality to cognition. Finally, we propose two further mechanisms—cultural transmission and dominance dynamics—that can enhance social cohesion by aligning behaviour and reducing uncertainty.

Ectotherms, particularly fish, challenge traditional brain evolution theories by exhibiting advanced cognitive abilities despite their smaller brains. While the social brain hypothesis may apply within clades, sensory-motor systems likely explain the brain size differences between average-brained ectotherms and endotherms. Evolved complex sensory-motor systems suggest that brain evolution models should expand to include sensory and motor systems, beyond cognitive processes alone.

Rosenholtz proposes to replace the concept of attention with peripheral vision models, such as the Texture Tiling Model (TTM). Here, we show that the TTM fails in many psychophysical studies due to its local, single-stage, feedforward, and low-level processing. Given that both attention and peripheral vision are unsettled fields, we argue that replacing one with the other is unwarranted.

The review argues that researchers can and should disregard the examination of eye movement behavior when seeking to understand the role that peripheral vision plays in various tasks. We present specific examples to argue that eye movement behavior has and will continue to aid in confirming and disconfirming hypotheses regarding visual-cognitive information processing in a variety of tasks.

The clinical presentation and course of illness of older-age bipolar disorder (OABD) are highly variable. In addition, the presentation and course of bipolar disorder (BD) differ between females and males. This study aims to carry out a network analysis of older people with symptoms compatible with BD. Using a sample from the MentDis_ICF65+ study, a symptom network analysis was conducted according to gender and age in 555 people over 65 in the Community of Madrid (Spain). The network was estimated using the InsingFit package that implements a procedure called eLasso. These results reveal differences in the strength, closeness, and betweenness of the networks according to gender and for the age groups 65–74 and 75–84. Females present a network that is much more sparse, with a lower density, and consisting of two sub-networks: one composed of TALK (more talkative than usual) and RACIN (a flight of ideas, racing thoughts) and the other of PAINF (activities with painful consequences), SLEEP (the decreased need for sleep), GRAND (inflated self-esteem), and AGIT (psychomotor agitation). In the case of men, a denser network is obtained, with greater connections between all the symptoms, being the edge with greater weight than the one integrated by RACIN and GRAND. In relation to age, it is possible to observe changes in the model between the two age groups. These network differences support viewing OABD dimensionally and emphasize considering gender and age to improve understanding and personalize treatments for older adults with bipolar disorder symptoms.

Attention has been used to explain performance deficits in many visual tasks, even though it lacks a clear definition or distinction from visual perception. We agree with Dr. Rosenholtz that perceptual processes may account for many phenomena previously attributed to spatial attention. We further suggest that perceptual processes may underlie the study of temporal attention, namely the “attentional blink.”

We examine “allocentric” neglect from Rosenholtz’s perspective, focusing on visual limitations in the periphery rather than attention. Studies of allocentric neglect report no or limited data on visual field defects and extinction. We propose that if visual input is degraded, patients may fail to detect the left part of the stimulus and complete it perceptually (preattentively) rather than attentionally.

While agreeing with Rosenholtz that the broad concept of visual attention conflates phenomena with explanatory mechanisms, leading to a crisis that demands a paradigm shift, we argue that this issue partially arises from viewing attention within a predominantly perception-focused framework. We propose reframing visual attention as part of an integrated sensorimotor system, emphasizing its role in linking vision and action.

The groundbreaking, anti-homuncular view presented by the author complements conclusions from diverse areas of research, including (a) research on phenomena not concerning attention (e.g., involving anosognosia, scotomata, dreams, and consciousness) and (b) the hypothesis that attention should be construed as an effect (e.g., from the activation of priority signals and task sets) rather than as a cause.

We suggest that the crisis in visual attention is caused by problems prevalent in many other areas of psychology: low-power experiments and questionable research practices. We demonstrate that many attention experiments use sample sizes that are several orders of magnitude too small and argue that it is unreasonable to expect theoretical clarity based on such unreliable empirical data.

Rosenholtz describes “attention theory” as a scientific paradigm in crisis, in the Kuhnian sense. But is attention a theory? Here, I question this premise. Although there can be theories of attentional phenomena, attention is not a theory. Rather, like memory and emotion, attention is a psychological concept that captures a broad class of phenomena, requiring multiple mechanistic explanations.