Protection and vulnerability processes relevant for early onset of substance use: a test among African American children.

This research tested predictions from a self-regulation model of factors relevant for early onset of tobacco and alcohol use with a community sample of 889 African American children (mean age = 10.5 years). Criterion variables were peer substance use, willingness to use substances, and resistance efficacy (intention to refuse substance offers). Structural modeling indicated effects of temperament dimensions were mediated through self-control and risk-taking constructs, which were related to school involvement, life events, and perceived vulnerability to harmful effects of substances. Peer use was predicted by life events, poor self-control, and parent-child conflict; willingness was predicted by life events, risk taking, and (inversely) parental support; and resistance efficacy was predicted by perceived vulnerability and (inversely) poor self-control. Findings are discussed with reference to theoretical models of early protection and vulnerability processes.     

Spontaneous and learned turning behaviour in food- or water-restricted hooded rats

Some laboratory studies have suggested that whereas food restriction in animals leads to response alternation (behavioural flexibility), water restriction induces perseverative, stereotyped responding. Hooded rats, restricted to 1 hour per day access to either food or water, were tested on a radial-arm maze (using a procedure that eliminates algorithmic response strategies), for alternation in a 3-arm maze (both when the maze was familar and unfamilar, and with or without differential reward) and a 2-choice maze in which some animals were taught to alternate direction of turn, and others to perseverate. Both groups performed the radial-arm maze task competently and spontaneously alternated at a high rate. In the learned task, food-restricted rats were slower than water-restricted to reverse a consistent direction of turn; in the alternation condition, water-restricted rats developed a temporary, but strong, directional bias when making their first choice each day. Water-restricted subjects took water more readily than food-restricted took food when initially introduced to the apparatuses, but there was no consistent difference in motivation in the two conditions. The results provide little support for the notion that distinct cognitive-motivational states or behavioural strategies are induced by food- and water-restriction.     

Suicide in the Subway: Psychodynamic Aspects*

ABSTRACT: Fifty-one cases of suicide attempts in the subway have been investigated to examine the question of whether the method used has psychodynamic significance or is merely adventitious. We found that no single characteristic distinguished subway suicide from all other suicide modalities, although as a group the subway cases had a higher proportion of psychotic and previously suicidal patients than other series quoted in the literature. However, there were important differences between subway suicide cases seeking a “traumatic” death (jumping in front of a train; lying across the track awaiting destruction) and those seeking a “nontraumatic” death (electrocution on the live “third rail”). The traumatic group had histories of exposure to violence, other traumatic suicide attempts, hostile or destructive delusions, and many “destroy” words on psychological test protocols. The smaller nontraumatic group had no such history of exposure to violence; their previous suicide attempts were nontraumatic; delusions, when present, were not menacing; and the psychological tests showed more “escape” words than “destroy” words.