Failure to delay gratification following septal lesions in rats: Implications for an animal model of disinhibitory psychopathology

It has been proposed that dysfunction within a neural system composed of the medial septum, the posterior hippocampus and the orbito-frontal cortex (SHF system) may constitute the physiological basis of several disinhibitory syndromes in humans—psychopathy, hyperkinesis, alcoholism and extraversion. Consequently, the syndrome produced by lesions of the SHF system in animals is offered as a tentative behavioral model that may elucidate basic psychological components of human disinhibitory psychopathology. As predicted from this model, rats with septal lesions, like disinhibited humans, were less likely to delay gratification than controls when given a choice between waiting 10 sec for an assured reinforcement and an immediately available, though infrequently delivered, reinforcement. Inquiry into the nature of this deficit suggested that these rats are subject to an interference effect, such that the influence of future rewards on behavior could be disrupted or ‘eclipsed’ by the presence of more immediate, prominent, motivationally significant cues. The possibility that various disinhibitory syndromes in humans may also be due to a similar rigid focus of attention upon the most immediate or prominent motivationally significant event was briefly discussed.     

Self-control of smoking—I. effects of experience with imposed,increasing, decreasing and random delays

A test of a passive self-control training procedure suggested by Skinner was performed. After smoker's tolerance for delay of smoking was assessed, they were exposed to either an increasing, decreasing or random sequence of imposed delay of smoking and were then tested for tolerance to delay. Increasing delay significantly improved subjects' smoking inhibition while decreasing and random sequences had no significant effect. The results are attributed to either frustration extinction or rehearsal of coping responses to the aversiveness of delay.     

Allocation of study time and recall by learning disabled and nondisabled children of different ages

Study time and recall by learning-disabled and nondisabled children of five different ages were examined in a task requiring recall of digits that were presented at the child's own rate. Recall increased with age and was significantly higher by nondisabled than disabled children, particularly at older ages. As additional digits of each sequence were presented, study time by 8-year-old disabled and nondisabled groups were relatively constant, increased in older disabled and nondisabled children, but increased more in older nondisabled children than older learning disabled children. Instructions in hierarchical grouping of digits increased recall by all groups to a similar degree, but the increase by younger children and learning disabled children was associated with longer study times. The results suggest that allocation of study time and recall are developmentally delayed in learning disabled children.     

Psychological effects on college students of raising the drinking age

The current policy of raising the drinking age seems likely to have psychological costs for adolescents, including deterioration of their relationship with adult society. Colleges are likely to be the sites of heightened adolescent discontent because so many undergraduates are affected by the change in law. College administrators have the opportunity to reduce some of the psychological effects and ensure that adolescent discontent is channeled into developmentally enhancing activities.     

Children's use of multiple-counting skills: adaptation to task factors

The purpose of the study was to determine conditions under which young children enumerate by counting in multiples. Thirty-eight kindergartners and first-graders enumerated dot displays and gave verbal reports of their strategies; additionally, they were given an independent assessment of multiple-counting skill. Dot displays varied according to overall numerosity, perceptual arrangement (random, clustered, rectangular), and numerosity of subgroupings. Children were relatively accurate at enumerating small-numerosity and nonrandom displays. They were relatively likely to report counting by multiples, rather than by ones, on small-numerosity and clustered displays. Contingent upon their skill level, children counted by multiple units (twos, threes, and fours) that corresponded to the numerosity of subgroupings (2, 3, and 4). Contrasting effects of different numerosities and perceptual arrangements are discussed in terms of contextual support for the use, and development, of numerical skills among young children.     

Reaction to punishment in extraverts and psychopaths: Implications for the impulsive behavior of disinhibited individuals

To explore the factors mediating impulsivity in the syndromes of disinhibition, we investigated the ability of extraverts and psychopaths to use signals for punishment to withhold maladaptive approach behavior under various incentive conditions. The results provide evidence that (a) in comparison to controls, extraverts and psychopaths fail to use cues for punishment to inhibit incorrect approach responses; (b) the deficient response inhibition of disinhibited subjects is specific to approach-avoidance situations; (c) under conditions involving monetary rewards and punishments, disinhibited subjects are less likely to slow down, and may even respond more quickly, following punishment; and (d) the tendency to speed up rather than slow down following punishment is associated with failure to learn from punishment. The results suggest that once focused on obtaining reward, extraverts and psychopaths display an active (disinhibited) as opposed to a passive (reflective) reaction to punishment and frustrative nonreward. This reaction to punishment appears to interfere with learning cues for punishment and may underlie the poor passive avoidance learning and impulsive behavior that characterize the syndromes of disinhibition.