Discusses the use of the human health risk assessment model as a basis for developing ecological risk assessment (ERA). For ERA, risk to individuals is less important than the survival of the population, with the exception of endangered species. Suggests that ERA take into account the relative reproductive value of the potentially impacted…

The evidence for the cerebral organization of and hemispheric specialization for man's two principal psychological domains, language and visuospatial function, are selectively reviewed. Three theoretical models of cerebral organization are outlined. Some neuro-psychological and educational implications of sex differences in hemispheric…