Analyzed were serum levels of IgA, IgG, ad IgM in groups of institutionalized and noninstitutionalized Down's syndrome subjects and in institutionalized retarded children with other etiologies. (KW)

A comparison of plasma (pseudo) cholinesterase and erythrocyte (true) cholinesterase activity in 16 male childhood schizophrenic patients and 16 male nonpsychotic hospitalized controls revealed no significant differences between the two groups. (Author)

Examines reactions to menarche and the subsequent effects of this experience as a function of preparation for and timing of menarche. A questionnaire including measures of responses about first menstruation, current symptoms, and self-image was completed by 639 girls in fifth through twelfth grades. (Author/MP)

Haroutunian defends points made in a paper (Educational Theory v30 n3) relating Jean Piaget's conception of knowledge to his biological view of equilibrium in response to criticism by William E. Doll, Jr. (Educational Theory, v31 n2). Haroutunian asserts that Piaget's theories permit evolutionary change only by chance mutation. (PP)

Considers evidence on the criteria and characteristics of critical period phenomena with respect to endogenous and exogenous influences. Describes and evaluates methodology of critical period research and discusses past attempts at subclassification of the field and "recovery of function" as a refutation of the critical period…

Discusses the origin and intended meaning of the phrase "survival of the fittest." Traces the concept of "fitness" in a neo-Darwinian sense and outlines the use of the term in other contexts. (Author/MA)

Critiques an environmentalist view of the effects of nature and nurture on behavior. Argues for an interactionist position in which nature and nurture are totally and inextricably involved in each and every organismic response. (MP)

An epidemiological survey was designed to investigate the possible causal influence of biological and psychological factors on hyperactivity and conduct disturbance among 226 primary school boys. (Author/DB)

The deportment of each student in a third-grade classroom was rated by the teacher before and after the fall change from daylight savings time, to see if this disruption in circadian rhythms alters behavior. The deportment of boys improved significantly while the deportment of girls was significantly disrupted. (Author/SJL)

Overviews research studies dealing with the biological, psychological, and sociological aspects of menstruation and its relationship to mood, task performance, and sexual performance. Includes a discussion of research dealing with women suffering from mental health problems. (MK)

Reviews the established effects of light on the human organism and concludes that sunlight simulating environmental lighting in schools will result in greater student and teacher comfort, health, and increased performance and/or working capacity. (Author/MLF)