This article focuses on mirror self-recognition, the ability to recognize one's own image in a mirror. It presents the result of the first experiment on mirror self-recognition which showed that chimpanzees are able to learn that the chimps they see in the mirror are not other chimps, but themselves, as evidenced by self-directed behaviour. It reviews evidence for neural network for self-recognition and self-other differentiation and cites evidence that frontal cortex and cortical midline structures are implicated in self-recognition tasks. It (...) also suggests that the mirror self-recognition ability correlates to large brain size relative to the animal's body size. (shrink)

One of the major adaptations during the evolution of Homo sapiens was an increase in brain size. Here we present evidence that a significant and substantial proportion of variation in brain size may be related to changes in temperature. Based on a sample of 109 fossilized hominid skulls, we found that cranial capacities were highly correlated with paleoclimatic changes in temperature, as indexed by oxygen isotope data and sea-surface temperature. Indeed, as much as 52% of the variance in the cranial (...) capacity of these skulls could be accounted for by temperature variation at 100 ka intervals. As an index of more short-term seasonal fluctuations in temperature, we examined the latitude of the sites from which the crania originated. More than 22% of the variance in cranial capacity of these skulls could be accounted for by variation in equatorial distance. (shrink)

We argue that cognitive empathy and other instances of mental state attribution are a byproduct of self-awareness. Evidence is brought to bear on this proposition from comparative psychology, early child development, neuropsychology, and abnormal behavior.

Numerous searches have failed to identify a single co-occurrence of total blindness and schizophrenia. Evidence that blindness causes loss of certain NMDA-receptor functions is balanced by reports of compensatory gains. Connections between visual and anterior cingulate NMDA-receptor systems may help to explain how blindness could protect against schizophrenia.

Using a sample of 652 college students, we examined several implications of the hypothesis that the shape of the human penis evolved to enable males to substitute their semen for those of their rivals. The incidence of double mating by females appears sufficient to make semen displacement adaptive (e.g., one in four females acknowledge infidelity, one in eight admit having sex with two or more males in a 24-hour period, and one in 12 report involvement in one or more sexual (...) threesomes with two males). We also document several changes in post-ejaculatory behavior (e.g., reduced thrusting, penis withdrawal, loss of an erection) which may have evolved to minimize displacement of the male’s own semen. Consistent with predictions derived from a theoretical model (Gallup and Burch 2006), we discovered that most females report waiting at least 48 hours following an instance of infidelity before resuming sex with their in-pair partners. (shrink)

Aspects of Northoff's argument lend themselves to the ongoing investigation of localizing the self in the brain. Recent data from the fields of neuropsychology and cognitive neuroscience provide evidence that the right hemisphere is a candidate for localization of self. The data on catatonia further that proposition and add insight into the continuing investigation of self in the brain across sensory and motor domains.

Heyes's attempt to reinterpret research on primate cognition from the standpoint of radical behaviorism is strong on dialogue and debate but weak on evidence. Recent evidence concerning self-recognition, for example, shows that her arguments about differential recovery from anesthetization and species differences in face touching as alternative accounts of the behavior of primates in the presence of mirrors) are invalid.

Questions of animal welfare and animal rights have captured a growing amount of public and political attention. Antivivisectionists have become increasingly critical of all animal research and behavioral research has been targeted as an issue of particular concern. Indeed, McArdle, who until recently was a ranking official of the Humane Society of the United States, advocates the 'complete elimination" of all psychological experimentation on animals. Are animal welfare and animal rights activists conscientiously concerned with the genuine well being of animals? (...) Are they focusing their efforts where they can do the most good? Have they developed an internally consistent and logical stand on these issues? Are they innocent of selective perception and compartmentalization when it comes to questions of pain and suffering in animals? In this paper we critically examine some of the arguments against the use of animals in psychological research and show that many of the positions held by antivivisectionists are untenable. 2012 APA, all rights reserved). (shrink)

Responds to the comments by A. N. Rowan on the current author's original discussion regarding animal rights. In his original paper, Gallup maintains that there are no inherent rights; they are inventions of the human mind. Thus, animals only have rights if we say the do. Rowan, however, asserts there is more universal agreement as to why some beings have certain rights than Gallup credits. Here, Gallup suggests that Rowan has sidestepped the issue. If rights are something other than an (...) invention of the human mind, then what are they, what form do they take, from whence do they come, and how are we to identify them? Contrary to what Rowan implies, Gallup says his intention was not to take a stand on whether or not animals have rights. To reiterate, says Gallup, animals only have rights to the extent that we say they do. 2012 APA, all rights reserved). (shrink)