Memes are not best understood as semantic information stored in brains, but rather, as whatever is imitated or copied in culture. Whereas other theories treat culture as an adaptation, for memetics it is a parasite turned symbiont that evolves for its own sake. Memetics is essential for understanding today's information explosion and the future evolution of culture.

We argue that van der Velde's & de Kamps's model does not solve the binding problem but merely shifts the burden of constructing appropriate neural representations of sentence structure to unexplained preprocessing of the linguistic input. As a consequence, their model is not able to explain how various neural representations can be assigned to sentences that are structurally ambiguous.

There are few commonalities between intraspecific aggression and predation and few convincing arguments for the conceptualisation of blood and pain as rewards for predation. Not cruelty, but ritualised intraspecific aggression is the predominant mechanism of accretion of social power and this, not cruelty, is what bestows reproductive advantages. Enjoyment of media cruelty is not reinforced by emotional circuits adapted to predation, but represents transient relief from culturally determined inhibition of aggression.

The ocean of academic knowledge is now so wide and so deep that university administrators must rely on the incumbents in their departments to identify and train new hires. This is in direct contrast to a sports team, where management can readily identify new talent. It follows that aging academics get to enjoy tenure, whereas older athletes do not.

The tension between focusing on species similarities versus species differences (phylogenetic versus adaptationist approaches) recurs in discussions about the nature of neural connectivity and organization following brain expansion. Whereas Striedter suggests a primary role for response inhibition, other possibilities include dense recurrent connectivity loops. Computer simulations and brain imaging technologies are crucial in better understanding actual neuronal connectivity patterns.

Nell restricts cruelty to hominids, although good evidence suggests that secondary aggression in rodents and particularly primates may be considered cruel. A considerable literature shows that glucocorticoid secretion stimulated by stress facilitates learning, memory, arousal, and aggressive behavior. Either secondary aggression (to a conspecific) or increased affiliative behavior reduces stressor-induced activity, suggesting the reward system can be satisfied by other behaviors than cruelty.

The analogy between biological and cultural evolution is not perfect. Yet, as Mesoudi et al. show, many of the vaunted differences between cultural and genetic evolution (for example, an absence of discrete particles of cultural inheritance, and the blurred distinction between cultural replicators and cultural phenotypes) are, on closer inspection, either illusory or peripheral to the validity of the analogy. But what about horizontal transmission? We strongly agree with the authors that the potential for horizontal transmission of cultural traits does not invalidate an evolutionary approach to culture. We suggest, however, that it does require a different evolutionary treatment.

This commentary criticises Bering on two counts. First, because we do not know what he attributes to natural selection and what he sees as derived representations. Second, Bering's ethnography of religion is inadequate. People who practise ancestor worship are not concerned with their own survival but with that of others. Many supernatural beings are not thought of as morally motivated.

Ceci et al. draw conclusions that are inaccurate, analyze and report results inappropriately, fail to translate their scale into policy-relevant terms, and draw overly strong conclusions from their single study. They also attribute all the ills of academic appointments to tenure, and ignore problems with other aspects of the system. Their conclusion that tenure is not supported is at best premature.

Blair proposes that fluid intelligence, working memory, and executive function form a unitary construct: fluid cognition. Recently, our group has utilized a combined correlational–experimental cognitive neuroscience approach, which we argue is beneficial for investigating relationships among these individual differences in terms of neural mechanisms underlying them. Our data do not completely support Blair's strong position.

An effective restructuring of the social sciences around the evolutionary model requires that evolutionary theory has explanatory power with respect to the spread of cultural traits: The causal mechanisms involved should be structurally analogous to those of biological evolution. I argue that this is implausible because phenotypical consequences of cultural traits are not causally relevant to their chances of “survival.”

Bering argues that belief in posthumous intentional agency may confer added fitness via the inhibition of opportunistic behavior. This is true only if these agents are interested parties in our moral choices, a feature which does not result from Bering's imaginative constraint hypothesis and extends to supernatural agents other than dead people's souls. A by-product model might handle this better.

Increases of absolute brain size during evolution reinforced stronger structuring of brain connectivity. One consequence is the hierarchical cluster structure of neural systems that combines predominantly short, but not strictly minimal, wiring with short processing pathways. Principles of “large equals well-connected” and “minimal wiring” do not completely account for observed patterns of brain connectivity. A structural model promises better predictions.

Aggression, violence, and cruelty are symptoms of psychiatric illness. They reflect abnormalities in the regulation of the stress and emotion circuitries. The functioning of these circuitries depends upon the interaction between genetics and environment. Abuse and neglect during infancy, as well as maternal stress and poor quality of maternal care, are some of the causes that produce these types of abnormal behavior. Research on the neurobiological bases of emotion regulation will allow the detection of the population at risk.

Tenure is designed to protect the academic freedom of faculty members by insulating them from arbitrary dismissal by administrative authorities external to their community of scholars. Therefore, the target article's focus on constraints that derive from peer pressures and academic politics is misplaced, rendering the results of the survey irrelevant to the issue of the value of tenure.

Blair describes fluid cognition as highly related to working memory and executive processes, and dependent on the integrity of frontal-lobe functioning. However, the literature review appears to neglect potential contributions to fluid cognition of the focus of attention as an important information-storage device, and the role of posterior brain regions in that kind of storage. Relevant cognitive and imaging studies are discussed.

The impulse toward violence and cruelty is endemic to the human species. But so, likewise, is the impulse toward compassionate behavior. Victor Nell acknowledges this, but he does not explore the matter any further. I supplement his account by discussing how compassion, specifically in the moral education of children, can help remedy the problem of violence and cruelty in society.

Academic opinions are irrelevant to the value of tenure. Facts are relevant, and the facts are that tenure protects some academics from losing their jobs because they communicate unpopular information, and that some untenured academics do lose their jobs because they communicate unpopular information.

Two studies substantiating Blair's main postulates are summarized. The first study showed that fluid cognition, reasoning, and perceived competence about reasoning are separate and equipotent partners in g. The second study showed that reasoning, understanding of emotions, and perceived competence about reasoning and emotions partake in the formation of g, substantiating Blair's claim that cognition and emotion are linked in the brain.

Mathematical models are potentially as useful for culture as for evolution, but cultural models must have different designs from genetic models. Social sciences must borrow from biology the idea of modeling, rather than the structure of models, because copying the product is fundamentally different from copying the design. Transfer of most cultural information from brains to artificial media increases the differences between cultural and biological information.