Stepping through the drug use sequence: longitudinal scalogram analysis of initiation and regular use.

Using a new technique for tracing the sequence of use over time, this study examined the pattern of drug involvement among 4,145 West Coast adolescents over the 4-year span from Grades 7-10. During the period covered, the mid- to late 1980s, we found no evidence that cocaine has become a gateway drug. However, the data provided some support for treating cocaine initiation as a separate stage that precedes the onset of hard drugs other than pills. The analysis also showed that increased involvement with legal drugs constitutes an important step in the transition to hard drug use for most adolescents. Weekly alcohol use followed marijuana use and preceded use of all other illicit drugs for Hispanic, White, and Black youth. However, it followed use of hard drugs for Asians. Weekly smoking formed a distinct stage between initial use of pills and other hard drugs for non-Hispanic Whites. The results underscore the importance of prevention efforts aimed at curbing the transition to regular use of alcohol and cigarettes, as well as their initial use.     

The effects of strategy—Monitoring training on children's selection of effective memory strategies

Second grade children were given training in general principles of strategy monitoring prior to being exposed to differentially effective acquisition strategies in a memory task. The results showed that even though both experimental and placebo control groups could assess when they remembered better, more experimental than control children attributed performance differences to their strategic behavior and then selected the more effective strategy on a forced-choice trial. These findings indicate that instruction in general memory-monitoring principles is sufficient to effect a change in strategy usage. The study therefore provides direct experimental support for the presumed relationship between metacognitive knowledge and subsequent strategy use.     

Facilitating sexual arousal via anger,aggression, or dominance

The hypothesis that either an angry emotional state or the expression of aggressive behavior facilitates sexual arousal has been the subject of considerable speculation but relatively little research. In a series of studies, Barclay found that anger increased sexual arousal as measured by the amount of sexual imagery produced in response to TAT-like stimuli that depicted males and females in dominant and submissive roles. In the present research, a series of experiments was conducted to determine whether such facilitation can be generalized beyond the specific procedures used by Barclay. Subjects (151 males and 136 females) in three experiments were angered by being negatively evaluated by a confederate identified as a fellow subject. Some subjects were subsequently given an opportunity to aggress; additionally, some subjects were exposed to male- and female-dominant pictorial stimuli. Results indicated that neither anger instigation nor the opportunity to engage in aggressive acts influenced self-reported sexual arousal. There was consistent evidence, however, that portrayals of dominance influenced perceptions of the stimulus person's sexuality. Though anger and aggression do not seem to facilitate sexual arousal, dominance cues (which can be confounded with anger manipulation) clearly elicit perceptions of sexuality.     

Pavlovian contingencies and resistance to change in a multiple schedule

According to theoretical accounts of behavioral momentum, the Pavlovian stimulus—reinforcer contingency determines resistance to change. To assess this prediction, 8 pigeons were exposed to an unsignaled delay-of-reinforcement schedule (a tandem variable-interval fixed-time schedule), a signaled delay-of-reinforcement schedule (a chain variable-interval fixed-time schedule), and an immediate, zero-delay schedule of reinforcement in a three-component multiple schedule. The unsignaled delay and signaled delay schedules employed equal fixed-time delays, with the only difference being a stimulus change in the signaled delay schedule. Overall rates of reinforcement were equated for the three schedules. The Pavlovian contingency was identical for the unsignaled and immediate schedules, and response—reinforcer contiguity was degraded for the unsignaled schedule. Results from two disruption procedures (prefeeding subjects prior to experimental sessions and adding a variable-time schedule to timeout periods separating baseline components) demonstrated that response—reinforcer contiguity does play a role in determining resistance to change. The results from the extinction manipulation were not as clear. Responding in the unsignaled delay component was consistently less resistant to change than was responding in both the immediate and presignaled segments of the signaled delay components, contrary to the view that Pavlovian contingencies determine resistance to change. Probe tests further supported the resistance-to-change results, indicating consistency between resistance to change and preference, both of which are putative measures of response strength.     

Effects of Environmental Odor and Coping Style on Negative Affect,Anger, Arousal,and Escape1

Trait coping, state anger, perceived arousal, blood pressure, negative affect, and escape behavior were measured in a sample of 240 undergraduate males and females exposed to 1 of 4 foul-odor conditions or to a no-odor condition. Consistent with Baron and Bell's (1976) negative-affect-escape model, it was hypothesized that people exposed to noxious odors would experience increased negative affect and heightened motivation to escape the situation. Results showed that negative affect and motivation to escape, but not anger or arousal, increased significantly as odor became more noxious. In addition, anger and motivation to escape significantly predicted negative affect. Variances in anger and perceived arousal, but not discomfort and escape, were accounted for mainly by trait coping styles and gender differences. Variances in discomfort and escape were accounted for mainly by odor alone.     

Reward, Punishment, Privatization, and Moral Suasion in a Commons Dilemma

Strategies such as privatization, counterreinforcers, and moral suasion have been suggested and tested as means of preserving shared, slowly regenerating resources such as whales, clean air, and forests. We hypothesized that reinforcers would preserve a shared simulated resource best when it was shared in a commons dilemma format, and would be relatively ineffective when the resource was divided into private territories. Subjects in groups of three played a game in which they had to harvest resources from a slowly regenerating pool without depleting the resource. Three levels of reinforcement (reward, punishment, or no reinforcement) were crossed with three game structures (territoriality. Golden Rule moral suasion, and basic structure). Results showed that neither reward nor punishment helped the management of the commons when the resource was broken down into private segments, but both reward and punishment helped in the Golden Rule and basic structure conditions. Subjects perceived the territorial condition to be more competitive and more under their control compared to the moral suasion or basic structure conditions. In the moral suasion condition. subjects enjoyed either reinforcement condition (reward or punishment) more than no reinforcement.     

On the relation between time and space in the visual discrimination of velocity.

Is the perception of velocity determined by the prior discrimination of spatial and temporal distances? Two experiments sought to answer this question by comparing the discriminabilities of moving stimuli varied in spatial extent, temporal duration, or in redundant combinations of both variables. The subject's task was to identify which of two alternative stimuli was presented on each trial. A set of four stimuli was constructed from two values of spatial extent and two values of temporal duration. Separate conditions required discrimination of each of the six possible pairs of these stimuli. Experiment 1 examined continuous motion and Experiment 2 examined apparent motion for stimuli with short (50 versus 65 msec) and with long (500 versus 650 msec) interstimulus intervals. With continuous motion and with good apparent motion (short intervals), the discrimination between the different-velocity bivariate pairs was too accurate to be attributed only to discriminations of the spatial and temporal extents of the motion. This did not occur with poor apparent motion. Evidently, time and space are perceptually related.