Risk‐taking and the adolescent brain: who is at risk?

Relative to other ages, adolescence is described as a period of increased impulsive and risk-taking behavior that can lead to fatal outcomes (suicide, substance abuse, HIV, accidents, etc.). This study was designed to examine neural correlates of risk-taking behavior in adolescents, relative to children and adults, in order to predict who may be at greatest risk. Activity in reward-related neural circuitry in anticipation of a large monetary reward was measured with functional magnetic resonance imaging, and anonymous self-report ratings of risky behavior, anticipation of risk and impulsivity were acquired in individuals between the ages of 7 and 29 years. There was a positive association between accumbens activity and the likelihood of engaging in risky behavior across development. This activity also varied as a function of individuals' ratings of anticipated positive or negative consequences of such behavior. Impulsivity ratings were not associated with accumbens activity, but rather with age. These findings suggest that during adolescence, some individuals may be especially prone to engage in risky behaviors due to developmental changes in concert with variability in a given individual's predisposition to engage in risky behavior, rather than to simple changes in impulsivity.     

Process components of the Implicit Association Test: a diffusion-model analysis

The authors present a diffusion-model analysis of the Implicit Association Test (IAT). In Study 1, the IAT effect was decomposed into 3 dissociable components: Relative to the compatible phase, (a) ease and speed of information accumulation are lowered in the incompatible phase, (b) more cautious speed-accuracy settings are adopted, and (c) nondecision components of processing require more time. Studies 2 and 3 assessed the nature of interindividual differences in these components. Construct-specific variance in the IAT relating to the construct to be measured (such as implicit attitudes) was concentrated in the compatibility effect on information accumulation (Studies 2 and 3), whereas systematic method variance in the IAT was mapped on differential speed-accuracy settings (Study 3). Implications of these dissociations for process theories of the IAT and for applications are discussed.     

Delayed matching-to-sample performance: Effects of relative reinforcer frequency and of signaled versus unsignaled reinforcer magnitudes

Six pigeons were trained on a delayed red-green matching-to-sample task that arranged four delays within sessions. Matching responses intermittently produced either 1.5-s access to food or 4.5-s access to food, and nonmatching responses produced either 1.5-s or 4.5-s blackout. Two phases were conducted: a signaled phase in which the reinforcer magnitudes (small and large) were signaled by houselights (positioned either on the left or right of the chamber), and an unsignaled phase in which there was no correlation between reinforcer magnitude and houselight position. In both phases, the relative frequency with which red and green matching responses produced food was varied across five values. Both matching accuracy and the sensitivity of performance to the distribution of reinforcers for matching responses decreased with increasing delays in both phases. In addition, accuracy and reinforcer sensitivity were significantly lower on signaled small-reinforcer trials compared with accuracy and sensitivity values on signaled large-reinforcer trials and on both types of unsignaled trials. These results are discussed in the context of research on both nonhuman animal and human memory.     

Cross-cultural pastoral counseling: Method or hermeneutic?

This article explores some of the meta-questions that emerge when talking about “cross-cultural pastoral counseling.” Is it a distinct counseling method or a practical hermeneutic that prompts the counselor to examine his or her therapeutic approach? The author argues that “cross-cultural pastoral counseling” is really a hermeneutic that challenges the pastoral counselor to an ongoing evaluation of how and to what extent his or her approach to pastoral counseling may be guided by dominant social convention versus the gospel mandate of Matthew 25: 31–46 [RSV]. The article reviews relevant literature, discusses three fundamental changes (“conversions”) that are necessary for the pastoral counselor in order to do cross-cultural pastoral counseling, and presents a case illustration involving a multi-cultural pastoral counseling intervention.     

Is parenthood a desirable adult role? An assessment of attitudes held by contemporary women

The purpose of this study was to explore contemporary women's perception of parenthood. The attitudes toward parenthood of 213 undergraduate females enrolled in family or women's studies courses were measured by an 11-item Likert-type scale. Major findings include (a) the expectation that parenthood will be among the subjects' adult roles, but will be delayed; (2) a rejection of the idea that motherhood is a prerequisite to women's happiness and fullfillment; (3) a confused perception of the effect of parenthood on the male; and (4) a suggestion that although these young women intend to parent, they assess their preparation to do so as limited.     

A new probe technique for the identification of serial learning processes

We describe a new serial learning probe technique which permits identification of functional stimuli for each individual item immediately following the trial on which it has been learned. Some empirical evidence indicating the validity of the serial probe technique is also presented. The potential superiority of the probe technique over alternative experimental methods for determining the basic processes involved in serial learning is noted.     

The relative efficacy of thought-stopping and covert assertion

The relative efficacy of Rimm's (1973) thought-stopping and covert assertion, thought-stopping alone, covert assertion alone and a placebo control was tested. All three experimental treatments were predicted to be superior to the control and differences among the experimental treatments were expected. Thirty-six volunteers with a strong fear of harmless snakes were given one of the four treatments. Results demonstrated the efficacy of the combined treatment, as had been shown in previous research, but also demonstrated the efficacy of the individual components alone. Scheffée Planned Comparisons at the post test and four week follow-up indicated that the three experimental groups were superior to the control on the three self-report and behavioral tests of fear of snakes (p < 0.01 for each) but not on a test of fears in general. Scheffée Post Hoc Comparisons showed no significant differences between the experimental groups. The possible overlapping functions of the components are discussed.     

Stimulus control and response bias in an analogue prey-detection procedure

The present study compared the performance of 6 pigeons trained to detect luminance differences in two different signal-detection procedures. Exposed to a three-key array, the pigeons were trained to peck the left key when the brighter of two light intensities had been presented on the center key and to peck the right key when the dimmer of two light intensities had been presented on the center key. Procedure A was a standard signal-detection procedure in which left/bright and right/dim responses produced food reinforcement and left/dim and right/bright responses produced periods of timeout. Procedure B was designed to simulate some of the contingencies operating in a prey-detection situation. Left-key responses produced reinforcement following the brighter center-key stimulus and a period of timeout following the dimmer center-key stimulus. Right-key responses always produced a short period of timeout irrespective of the stimulus. Within each procedure, the duration of timeout arranged for false alarms (left/dim responses) was varied between 3 s and 120 s. Measures of accuracy and response bias were compared between the two procedures. The timeout manipulation produced systematic, but relatively small, changes in these measures when right/dim responses (i.e., correct rejections) produced reinforcement (Procedure A). Arranging timeout for right/dim responses in Procedure B produced greater variability in accuracy and response bias than did arranging reinforcement, but this variability was not related to timeout duration. Overall, discrimination accuracy was considerably higher when right/dim responses produced timeout than when they resulted in reinforcement, and accuracy was accompanied by a large bias toward the response associated with reinforcement. These results are consistent with a recently proposed model of signal detection.