On the Unity of Compound Things: Living and Non-Living

There appear to be at least two kinds of compound physical substances: compound pieces of matter, which have their parts essentially, and living organisms, which do not. Examples of the former are carbon atoms, salt molecules, and pieces of gold; and examples of the latter are protozoa, trees, and cats. Given that there are compound entities of these two kinds, and given that they can be created or destroyed by assembly or disassembly, questions naturally arise about the nature of the causal relations which unite their parts. In answer to these questions, we first argue that the parts of a compound piece of matter are connected via a relation of dynamic equilibrium of attractive and repulsive forces. We then argue that the parts of an organic living thing are united in a different way: they are functionally connected in a broadly Aristotelian sense which is compatible with an ultimately non-teleological, naturalistic biology.     

Lead and hyperactivity: Lead levels among hyperactive children

Previous work has demonstrated an association between hyperactivity and increased body lead burdens in school-age children. In the present study it is shown that within a group of hyperactive children those for whom an organic etiology is present have lead burdens lower than in those for whom no apparent cause could be found. These data lead us to reject the notion that hyperactivity per se is responsible for the acquisition of elevated lead levels, and further strengthen the suspicion that for some children lower lead level absorption may be implicated in the development of the hyperkinetic disorder.This work was supported in part by the Office of Child Development, Grant #OCD-CB482. We thank Dr. Bernard Davidow for blood and urine determinations done by the Bureau of Laboratories, Lead Poison Division, Public Health Service, New York City. We also wish to thank Merck, Sharpe and Dohme for supplying the penicillamine for this study.     

A two-stage model of visual search

A two-stage visual search model is described. Four experiments show that in a VM paradigm sequential presentation of the display leads to increases in accuracy and decreases in latency. Slower presentation rates allow for faster transfer of the target from iconic to short-term memory. When target and background items are dissimilar, transfer to short-term memory need not take place and decisions can be made on the basis of the Stage 1 analysis. These results are taken as confirming evidence for the proposed model.     

An opponent-process theory of motivation: III. Some affective dynamics in imprinting

The theory suggests that for immature precocial birds, the stimulation from an appropriate imprinting object innately arouses a primary effective process that is hedonically pleasant. The occurrence of this process automatically generates (via an opponent loop system) an opponent-process which is hedonically unpleasant. When the imprinting object is withdrawn, the primary process rapidly terminates, but the opponent-process persists, unopposed, for some time. By assuming that the opponent-process becomes stronger with its repeated (or prolonged) arousal, it is possible to account for many of the motivational factors in imprinting. These include: (1) the pattern of distress vocalization that occurs when an imprinting object is first presented to and then withdrawn from newly hatched ducklings, (2) the reinforcement and punishment effects that characterize imprinting, and (3) the priming effects that occur in the context of imprinting.     

Psychoanalysts in the Public Eye: Internal Resistances

An attitude against public presentations has been part of the inward looking stance of organized psychoanalysis and has contributed to the often-heard comment that psychoanalysis is a dying profession. Because of the very private nature of clinical psychoanalytic work, this ambivalence to public appearances continues to exist in all psychoanalysts. We have to realize that it is crucial for psychoanalysts to educate the public about psychoanalytic ideas while being aware of possible unintended negative consequences, such as interference in transference issues with patients, ethical and privacy violations, distortion in the press coverage, unfairly biased antipsychoanalytic coverage, and concern about disapproval from prominent and influential members of psychoanalytic organizations about the nature of the press coverage (or even of press coverage at all) leading to criticism of an individual psychoanalyst and interference with his or her progression. Our public information efforts have to include using misfired efforts as teaching tools and insure that presentation of clinical material is limited and sufficiently disguised.     

Would you be happier if you moved more? Physical activity focusing illusion

Current Psychology - Research shows that individuals who are more physically active also report greater happiness. However, subjective well-being is prone to cognitive biases. For instance, people...