Two experiments were performed to examine musicians' and nonmusicians' electroencephalographic (EEG) responses to changes in major dimensions (tempo, melody, and key) of classical music. In Exp. 1, 12 nonmusicians' and 12 musicians' EEGs during melody and tempo changes in classical music showed more alpha desynchronization in the left hemisphere (F3) for changes in tempo than in the right. For melody, the nonmusicians were more right-sided (F4) than left in activation, and musicians showed no left-right differences. In Exp. 2, 18 musicians' and 18 nonmusicians' EEG after a key change in classical music showed that distant key changes elicited more right frontal (F4) alpha desynchronization than left. Musicians showed more reaction to key changes than nonmusicians and instructions to attend to key changes had no significant effect. Classical music, given its well-defined structure, offers a unique set of stimuli to study the brain. Results support the concept of hierarchical modularity in music processing that may be automatic.
9 men scoring as Type A and Angry and 9 men scoring as Type B and Nonangry on the Jenkins Activity Survey and Spielberger's Trait Anger Expression completed a 1-min. mental arithmetic task and slept through 1 period of rapid eye movement. The Angry Type A scorers showed greater heart-rate increases from baseline to that during mental arithmetic and from nonrapid eye movements to periods of REM than the Nonangry Type B scorers. While the former showed equivalent reactivity to stressors while awake and asleep, the latter group showed less heart-rate reactivity during the period of REM than during mental arithmetic. Neither group yielded clear descriptions of their dreams, and no differences between groups were noted for ratings on aggressivity in dreams. It appears that Angry Type A scorers show cardiovascular hyperreactivity even when asleep in the lab.
Characteristics of the attack‐target in laboratory tests appear to greatly influence the tendency for aggression to be initiated, maintained, and stopped. To address this question, accessibility, target movement, and vocalization among pigeon conspecifics were investigated in two different aggression tests: 1) paired aggression (PA); and 2) schedule‐induced aggression (SI). In the PA test, dominant and subordinate roles formed quickly, and soon aggression episodes started to decline. In part, the subordinate's yielding behavior appeared to discourage attack. The significance of the target bird's behavior on attack frequency was borne out by the finding in the SI test that pigeons attacked a shielded, live, active target more often than a passive one. Furthermore, using a specially constructed stuffed pigeon in the SI test, results indicated that programmed, combined aggressive vocalization and body movement evoked most attacks with the VT schedule, vocalization alone evoked the next highest number of attacks, body movement alone the third most, and combined silence and immobility the least attacks. These findings provide a basis for explaining some past reported results associated with target features and a means for selecting other target features for future study.
Following surgical preparation, male hooded rats were trained to descend from a platform and cross a grid floor for food. Upon reaching a performance criterion, a single treatment trial was administered. Upon descent from the platform on the treatment trial, the subjects received footshock, which was followed immediately by the delivery of a single .5-msec, lOO-,u\ pulse of intracranial stimulation delivered unilaterally to either the amygdala or dorsal hippocampus. Performance on recall tests administered 24 and 48 h after the treatment trial revealed memory alteration in amygdala-stimulated subjects but not in hippocampus-stimulated or control subjects. These results suggest that the amygdala and hippocampus may have different roles in memory processing. The contribution of amygdala in memory processing may involve affective quality and quantity of specific events. A new interpretation of the nature of memory modification by electrical brain stimulation is discussed.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.