In Sagvolden et al.’s conceptualization of how a poor behavioral, social, and academic repertoire arises from an impaired interaction with the environment of an individual with a neurological disorder, we see a convergence between the medical diagnosis and the functional assessment on which the behavioral educational approach is based. If children with such a disorder do show delay-of-reinforcement steepened gradients, it is possible to predict their behavior under given circumstances. This could bring us to more precise diagnostic criteria and better intervention techniques.

The target article authors' study has highlighted the relationship between market integration and an increased willingness to enter into cooperative exchanges. Less developed, albeit implied, in their analysis are the theoretical implications of their findings for the theory of altruism first developed by Adam Smith and later expanded in the works of the American historian, Thomas Haskell.

We agree that human culture is unique. However, we also believe that an understanding of the evolution of culture requires a comparative approach. We offer examples of collaborative behaviors from dolphin play, and argue that consideration should be given to whether various forms of culture are best viewed as falling along a continuum or as discrete categories.

We address the notion of integration of new memory representations and the potential dependence of this phenomenon on sleep, in light of recent findings on the lexicalization of spoken words. A distinction is introduced between measures tapping directly into the strength of the newly acquired knowledge and indirect measures assessing the influence of this knowledge on spoken word identification.

Conceptual space is proposed as an intermediate representation level between the psychological and the neurobiological levels of descriptions of appraisal and emotions. The main advantage of the proposed intermediate representation is that the appraisal and emotions dynamics are described by using the terms of geometry.

Diverse cultural norms governing economic behavior might emerge from a dynamic interaction of universal but flexible predispositions that get calibrated to biologically meaningful features of the local social and physical ecology. This impressive cross-cultural effort could better elucidate such gene-culture interactions by incorporating theory-driven experimental manipulations (e.g., comparing kin and non-kin exchanges), as well as analyses of mediating cognitive processes.

Learning procedural skills involves improvement in speed and accuracy. Walker proposes two stages of memory consolidation: enhancement, which requires sleep, and stabilization, which does not require sleep. Speed improvement for a motor learning task but not accuracy occurs after sleep-dependent enhancement. We discuss this finding in the context of computational models and underlying sleep mechanisms.

the claim of consistent hemispheric specialisations across classes of chordates is undermined by the absence of population-based directional asymmetry of paw/hand use in rodents and primates. no homologue of the cerebral torque from right frontal to left occipital has been established in a nonhuman species. the null hypothesis that the torque is the sapiens-specific neural basis of language has not been disproved.

This commentary makes three points: (1) There may be no clear-cut distinction between emotion and appraisal “constituents” at neural and psychological levels. (2) The microdevelopment of an emotional interpretation contains a complex microdevelopment of affect. (3) Neurophenomenology is a promising research program for testing Lewis's hypotheses about the neurodynamics of emotion-appraisal amalgams.

Tomasello et al. have not characterized the motivation underlying shared intentionality, and we hope to encourage research on this topic by offering comparative paradigms and specific empirical questions. Although we agree that nonhuman primates differ greatly from us in terms of shared intentionality, we caution against concluding that they lack all aspects of it before other empirical tools have been exhausted. In addition, identifying the conditions in which humans spontaneously engage in shared intentionality, and the conditions in which we fail, will more fully characterize this ability.

sunstein represents moral heuristics as rigid rules that lead us to jump to moral conclusions, and contrasts them with reflective moral deliberation, which he represents as independent of heuristics and capable of supplanting them. following john dewey's psychology of moral judgment, i argue that successful moral deliberation does not supplant moral heuristics but uses them flexibly as inputs to deliberation. many of the flaws in moral judgment that sunstein attributes to heuristics reflect instead the limitations of the deliberative context in which people are asked to render judgments.

Henrich et al.'s nice cross-cultural experiments would benefit from models that specify the decision rules that humans use and the specific developmental pathways that allow cooperative norms to be internalized. Such models could help researchers to design further experiments to examine human social adaptations. We must also test whether the “same” experiments measure similar constructs in each culture, using additional methods and measures.

Lewis argues convincingly that a DS approach to emotion theory will be fruitful. He also appears to hold that there are DS principles that constitute a theory or are substantial empirical claims. I argue that this latter move is a mistake.

Shared knowledge of intentionality as well as shared knowledge of anything depends on the organism's understanding of itself, others, and the possible relations between self and other. This understanding involves mental representations of me, which emerges in the second half of the second year in the human infant, and it is this ability that gives rise to humanlike social understanding and complex self-conscious emotions.

In this target article, Walker seeks to clarify the current state of knowledge regarding sleep and memory. Walker's review represents an impressively heuristic attempt to synthesize the relevant literature. In this commentary, we question the focus on procedural memory and the use of the term “consolidation,” and we consider the extent to which empirically testable predictions can be derived from Walker's model.

in considering a domain of knowledge – language, music, mathematics, or morality – it is necessary to derive principles that can describe the mature state and explain how an individual reaches this state. although sunstein's heuristics go some way toward a description of our moral sense, it is not clear that they are at the right level of description, and as stated, they provide no guidelines for looking at the acquisition process – the problem of explanatory adequacy.

Sleep disturbances are common for children with attentiondeficit/ hyperactivity disorder (ADHD) and are of great clinical significance. Brain dopamine plays an important role for both ADHD symptoms and sleep-wake regulation. We therefore suggest that one basic aspect of integrative brain-behavior relationship such as the sleep-wake cycle may certainly be addressed in a dynamic developmental theory of ADHD.

Henrich et al. propose that humans are genetically equipped with learning mechanisms that enable them to acquire the preferences and beliefs related to economic prosocial behaviors. In addition to their cross-cultural data, they cite developmental evidence in support of this theory. We challenge Henrich et al.'s interpretation of the developmental data in a discussion of recent work which suggests that preferences for altruism and fairness may have an innate basis.

Tomasello et al. provide a new account of cultural uniqueness, one that hinges on a uniquely human motivation to share intentionality with others. We favor an alternative to this motivational account – one that relies on a modular explanation of the primate intention-reading system. We discuss this view in light of recent comparative experiments using competitive intention-reading tasks.

I discuss how the work in Walker's article adds to the considerable body of research on dreaming, sleep, and memory that appeared in the early days of modern sleep research. I also consider the issue of REM-independent and REM-dependent kinds of learning. This requires including emotional issues in our discussion, and therefore emphasizes the importance of studying and understanding dreams.