Cognitive propositions

Soames's new theory of "cognitive propositions" is presented and several prima facie objections are presented to it.     

Psychiatrischer Beitrag

Ohne Zusammenfassung     

Social class background and the school-to-work transition

Whereas in years past, young people typically made a discrete transition from school to work, two ideal typical routes now characterize the sharing of school and work roles during adolescence and the transition to adulthood. Longitudinal data from the Youth Development Study show that one route involves less intensive employment during high school, followed by continued part-time employment and postsecondary educational investment. This pathway, more common for youth of higher-class origins, is especially beneficial for young people from lower socioeconomic backgrounds. A second route is early intensive work experience during high school that is less conducive to longer-term educational and wage attainments.     

Double dissociation of pharmacologically induced deficits in visual recognition and visual discrimination learning

Monkeys trained in either one-trial recognition at 8- to 10-min delays or multi-trial discrimination habits with 24-h intertrial intervals received systemic cholinergic and dopaminergic antagonists, scopolamine and haloperidol, respectively, in separate sessions. Recognition memory was impaired markedly by scopolamine but not at all by haloperidol, whereas habit formation was impaired markedly by haloperidol but only minimally by scopolamine. These differential drug effects point to differences in synaptic modification induced by the two neuromodulators that parallel the contrasting properties of the two types of learning, namely, fast acquisition but weak retention of memories versus slow acquisition but durable retention of habits.     

Presentation of Mexican Americans to a Memory Disorder Clinic

Despite the rapidly growing nature of the Mexican American population in the United States, relatively little is known regarding cognitive aging among this minority group compared to non-Hispanic, white individuals. The current study was conducted to describe the nature of cognitive and affective characteristics of Mexican American patients with dementia or other cognitive disorders on initial presentation to a Memory Disorder Clinic. Archival data were reviewed from this specialty clinic for 219 patients who were evaluated for the first time over a 2-year period. Twenty-two Mexican American patients were identified, and a sample of 22 matched non-Hispanic white patients was derived for comparison. When compared to non-Hispanic white patients, Mexican Americans were found in fewer numbers, reported higher levels of anxiety and depression, and produced lower scores on neurocognitive assessments. Results support the notion that Mexican American patients present for cognitive assessment and treatment at a greater stage of impairment severity as compared to non-Hispanic whites.