Olfaction as a model system for the neurobiology of mammalian short-term habituation

Olfaction represents an ideal model system for the study of mammalian habituation given that it is an anatomically relatively simple system with strong reciprocal connections to the limbic system, driving both reflexive and non-reflexive (motivated) behaviors that are easily quantifiable. Data are reviewed here demonstrating short-term habituation of the odor-evoked heart-rate orienting reflex described according to the criteria for habituation outlined by Thompson and Spencer [Thompson, R. F., & Spencer, W. A. (1966). Habituation: A model phenomenon for the study of neuronal substrates of behavior. Psychological Reviews, 73(1), 16–43]. A necessary and sufficient mechanism of short-term habituation is then described, which involves a metabotropic glutamate receptor mediated depression of afferent input to the piriform (primary olfactory) cortex. Finally, evidence for, and a mechanisms of, dishabituation of the orienting reflex and cortical adaptation are described.     

早期音乐暴露增强大鼠分辨声音时程的作业能力

用声一电防御性条件反射的方法。对42只具有不同早期听觉经验的大鼠的声音时程分辨行为进行了观察和比较研究。实验结果表明：大鼠具有一定的分辨声音时程的作业能力,出生后早期的音乐暴露,能够明显增强大鼠分辨声音时程的作业能力。     

Parental perception and interpretation of infant emotions: psychological and physiological processes

To study parental experience and perception of infant emotional expressions parents' responses to infant pictures depicting positive, neutral and negative emotions were assessed on the level of affective judgments (perceived and experienced valence and arousal), of mimic responses (facial muscle activity) and of the eyelid reflex (using the startle paradigm). In general, while parents were able to appropriately perceive infant emotions and were clearly affected by them, they exhibited a bias for positive interpretation. This was obvious from their subjective evaluations which, e.g. were more positive for experienced than for perceived valence, as well as from their mimic responses indicating positive responses in general. In addition, infant pictures including the negative ones lead to an inhibition of the startle reflex, indicating a positive evaluation of infant emotions on the sub‐cortical level. These effects were most prominent when parents were faced with pictures of their own infants as compared to unfamiliar ones. The way parents process information about infant emotions may facilitate appropriate responsiveness to infants' needs. Copyright © 2005 John Wiley & Sons, Ltd.     

The intelligent reflex

ABSTRACT

The seeming distinction between motor and cognitive skills has hinged on the fact that the former are automatic and non-propositional (knowing-how), whereas the latter are slow and deliberative (knowing-that). Here, the physiological and behavioral phenomenon of long-latency stretch reflexes is used to show that “knowing-that” can be incorporated into “knowing-how,” either immediately or through learning. The experimental demonstration that slow computations can, with practice, be cached for fast retrieval, without the need for re-computation, dissolves the intellectualist/anti-intellectualist distinction: All complex human tasks, at any level of expertise, are a combination of intelligent reflexes and deliberative decisions.