Our received theories of self-deception are problematic. The traditional view, according to which self-deceivers intend to deceive themselves, generates paradoxes: you cannot deceive yourself intentionally because you know your own plans and intentions. Non-traditional views argue that self-deceivers act (sub-)intentionally but deceive themselves unintentionally and unknowingly. Some non-traditionalists even say that self-deception involves a mere error (of self-knowledge). The non-traditional approach does not generate paradoxes, but it entails that people can deceive themselves by accident or by mistake, which is rather controversial. I argue that a functional analysis of human interpersonal deception and self-deception solves both problems and a few more. According to this analysis, my behavior is deceptive iff its function is to mislead; I may but need not intend to mislead. In self-deception, then, the self engages in some deceptive behavior and this behavior misleads the self. Thus, while it may but need not be intended, self-deception is never an accident or a mistake.

A satisfactory analysis of human deception must rule out cases where it is a mistake or an accident that person B was misled by person A's behavior. Therefore, most scholars think that deceivers must intend to deceive. This article argues that there is a better solution: rather than appealing to the deceiver's intentions, we should appeal to the function of their behavior. After all, animals and plants engage in deception, and most of them are not capable of forming intentions. Accordingly, certain human behavior is deceptive if and only if its function is to mislead. This solves our problem because if the function of A's behavior was to mislead, B's ending up misled was not an accident or a mere mistake even if A did not intend to deceive B.

In his article, Grossmann argues that, in the context of human cooperative caregiving, heightened fearfulness in children and human sensitivity to fear in others are adaptive traits. I offer and briefly defend a rival hypothesis: Heightened fearfulness among infants and young children is a maladaptive trait that did not get deselected in the process of evolution because human sensitivity to fear in others mitigates its disadvantageous effects to a sufficient extent.

Intrapericardial teratomas are extremely rare and most often benign tumours. In this paper, we have described a case of intrapericardial teratoma diagnosed prenatally and successfully operated. The presented case is noteworthy as an example of potentially catastrophic cardiorespiratory distress caused by the space-occupying nature of the tumour. A multi-disciplinary approach is mandatory because the tumour most often arises from the ascending aorta and in some cases may require the use of cardiopulmonary bypass.