Enhanced retention in the passive-avoidance task by 5-HT(1A) receptor blockade is not associated with increased activity of the central nucleus of the amygdala

The effect of blockade of 5-HT1A receptors was investigated on (1). retention in a mildly aversive passive-avoidance task, and (2). spontaneous single-unit activity of central nucleus of the amygdala (CeA) neurons, a brain site implicated in modulation of retention. Systemic administration of the selective 5-HT1A antagonist NAN-190 immediately after training markedly-and dose-dependently-facilitated retention in the passive-avoidance task; enhanced retention was time-dependent and was not attributable to variations in wattages of shock received by animals. Systemic administration of NAN-190 had mixed effects on spontaneous single-unit activity of CeA neurons recorded extracellularly in vivo; microiontophoretic application of 5-HT, in contrast, consistently and potently suppressed CeA activity. The present findings-that 5-HT1A receptor blockade by NAN-190 (1). enhances retention in the passive-avoidance task, and (2). does not consistently increase spontaneous neuronal activity of the CeA-provide evidence that a serotonergic system tonically inhibits modulation of retention in the passive-avoidance task through activation of the 5-HT1A receptor subtype at brain sites located outside the CeA.     

The Effects of Same-Sex and Other-Sex Contexts on Masculinity and Femininity

The study addressed whether or not masculinity and femininity as indexed by state measures of gender-typed behaviors changed when participants worked with asame-sex or other-sex peer. In a within-subjects design, 80 college students (40 women and 40 men, M age = 19.5 years, SD = 2.10) worked with a man and a woman confederate on a collaborative task. State masculinity and femininity measures were created from existing trait measures (Bem, 1974; Boldizar, 1991). Men and women reported greater state femininity when working with an other-sex partner than when working with a same-sex partner. State masculinity did not vary as a function of same-sex and other-sex contexts. Implications of these findings for understanding how social interactions contribute to the construction of masculinity and femininity are discussed.     

How Do Consumers Transfer Existing Knowledge? A Comparison of Analogy and Categorization Effects

The trend in recent consumer research has been to emphasize the similarities between analogy and categorization. In this investigation, we merge the literature on analogy, categorization, and structure mapping theory to reach a better understanding of their differences. In 3 experiments, we compare consumers’ responses to analogy and categorization cues and find that analogy places much greater constraints on knowledge transfer than categorization by focusing consumers on relational similarities. Illustrating this, the analogy group in Study 1 was just as likely as the categorization group to generate relational inferences, but much less likely to generate attribute inferences. Likewise, the results of Study 2 indicate that the analogy group restricted their processing of features lying outside the common relational system, leading to inferior recall relative to the categorization group. Building on these findings, Study 3 demonstrates that, under certain circumstances, analogy and categorization work together syn‐ergistically to enhance consumer memory.     

The impact of multiculturalism versus color-blindness on racial bias

The present study examined the influence of different interethnic ideologies on automatic and explicit forms of racial prejudice. White American college students were exposed to a message advocating either a color-blind or a multicultural ideological approach to reducing interethnic tension and then completed explicit racial attitude measures, as well as a reaction time measure of automatic evaluations of racial groups. Results suggested that, relative to the multicultural perspective, the color-blind perspective generated greater racial attitude bias measured both explicitly and on the more unobtrusive reaction time measure. The findings of the present study add to previous research advocating a multicultural or dual-identity model of intergroup relations as the more promising route to interracial harmony.     

Different effects of dual task demands on the speech of young and older adults

Young and older adults provided language samples in response to elicitation questions while concurrently performing 3 different tasks. The language samples were scored on three dimensions: fluency, grammatical complexity, and content. Previous research had suggested the hypothesis that the restricted speech register of older adults is buffered from the costs of dual task demands. This hypothesis was tested by comparing language samples collected during a baseline condition with those produced while the participants were performing the concurrent tasks. The results indicate that young and older adults adopt different strategies when confronted with dual task demands. Young adults shift to a restricted speech register when confronted with dual task demands. Older adults, who were already using a restricted speech register, became less fluent although the grammatical complexity and informational content of their speech was preserved. Hence, some but not all aspects of older adults' speech are buffered from dual task demands.     

Factor structure and validity of the MacArthur Competence Assessment Tool-Criminal Adjudication

Examination of the available literature regarding the development of the MacArthur Competence Assessment Tool-Criminal Adjudication (MacCAT-CA) reveals 2 theoretical factor structures on which the MacCAT-CA was based: one in which 3 lower-order constructs are proposed (understanding, reasoning, appreciation) and one in which 2 higher-order constructs are proposed (competence to assist counsel and decisional competence). Confirmatory factor analyses were conducted with the MacCAT-CA's original normative sample (N = 729) to test both the relative fit of these 2 theoretical factor structures and models that combine the 2 factor structures. Analyses were also completed to examine the convergent and discriminant validity of the MacCAT-CA. Results are discussed in terms of the strengths and weaknesses of the nomothetic nature of the MacCAT-CA.     

A laboratory school comparison of mixed amphetamine salts extended release (Adderall XR) and atomoxetine (Strattera) in school-aged children with attention deficit/hyperactivity disorder

Mixed amphetamine salts extended release (MAS XR; Adderall XR) and atomoxetine (Strattera) were compared in children 6 to 12 years old with attention deficit/hyperactivity disorder (ADHD) combined or hyperactive/impulsive type in a randomized, double-blind, multicenter, parallel-group, forced-dose-escalation laboratory school study. Primary efficacy measure was the SKAMP (Swanson, Kotkin, Agler, M-Flynn, and Pelham) behavioral rating scale. Changes in mean SKAMP deportment scores from baseline were significantly greater for MAS XR (n = 102) than for atomoxetine (n = 101) overall (-0.56 and -0.13, respectively; p < .0001) and at each week (p < .001). Adverse events were similar for both treatment groups. The extended time course of action and greater therapeutic efficacy of MAS XR suggests that it is more effective than atomoxetine in children with ADHD.