Preschoolers trust particular informants when learning new names and new morphological forms

Across three studies, we investigated whether 4‐year‐olds would trust a previously reliable informant when learning novel morphological forms. In Experiment 1, children (N= 16) were presented with two informants: one who correctly named familiar objects and another who named them incorrectly. Children were invited to turn to these informants when learning novel labels and morphological forms. The majority of children chose the previously correct labeller when learning novel label and morphology. In Experiment 2, children (N= 16) were presented with an informant who used familiar plurals correctly and one who used them incorrectly. Children chose the previously correct morphologist when learning novel labels and past tense forms. Thus, children track both semantic and morphological accuracy. In Experiment 3, some children (N= 16) were presented with two informants who differed in naming accuracy, whereas others (N= 16) were presented with two informants who differed in morphological accuracy. To forestall any risk of experimenter cuing, one experimenter blind to the training children had received, tested children with novel labels and morphology. The results replicated those of Experiments 1 and 2. Implications for how children's trust in an informant might play a role in their acquisition of morphological forms are discussed.     

Is EBM an Appropriate Model for Research into the Effectiveness of Psychotherapy?

Topoi - EBM, and the hierarchy of evidence it prescribes, is a controversial model when it comes to research into the effectiveness of psychotherapeutic treatments. This is due in part to the...     

Long-term follow-up of physical activity behavior in older adults.

OBJECTIVE: To examine the contribution of social-cognitive factors (self-efficacy and affect) in predicting long-term physical activity in a sample of older adults (N=174). DESIGN: A prospective design assessed physical activity and psychosocial variables at 2 and 5 years following a 6-month randomized, controlled exercise trial. MAIN OUTCOME MEASURES: The primary outcome variable was self-reported physical activity, with previous behavior, self-efficacy, and affect assessed as determinants of physical activity. RESULTS: Covariance modeling analyses indicated that physical activity at Year 2 was the strongest predictor of physical activity at 5-year follow-up. Both self-efficacy and affect at Year 2 were also associated with physical activity at Year 5, as was original treatment condition. Variables accounted for 35% of the variance in Year 5 activity. CONCLUSION: Older adults with higher levels of physical activity, more positive affect, and higher self-efficacy at Year 2 were more likely to continue to be active at Year 5. This study is one of the longest follow-ups of exercise behavior in older adults and has implications for structuring environments to maximize the maintenance of physical activity.     

Prototypical similarity,self-categorization,and depersonalized attraction: A perspective on group cohesiveness

In contrast to traditional approaches that widely equate group cohesiveness with interpersonal attraction, self-categorization theoryargues that self-categorization depersonalizes perception in terms of the group prototype, and transforms the basis of interindividual attitude (liking) from idiosyncracy into prototypicality. An implication is that while attraction in interpersonal relationships relates to overall similarity, attraction among group members is based on prototypical similarity. To test this idea, subjects (N = 219) participated in an experiment in which they reported their attitude towards an individual who would be their partner, or a fellow group member (of either group ‘Visual’ or group ‘Tactile’) for a subsequent task. Subject-target similarity varied on each of two dimensions: dimension ‘A’ was more prototypical of group ‘Visual’, and dimension ‘F’ of group ‘Tactile’. The independent variables of social orientation (interpersonal, group ‘Visual’, group ‘Tactile’), similarity on dimension A (A ±), and dimension F(F±) were manipulated in a 3 × 2 × 2 design. The three hypotheses tested in this experiment were generally supported. Subjects preferred prototypically similar group members to interpersonal partners, and downgraded prototypically dissisimilar group members (HI). Identification was positively related to target evaluation (H2), more strongly for prototypically similar than dissimilar targets (H3), and the identification-attraction relationship was mediated by perceived prototypical similarity. Group-based effects were independent of perceptions of overall similarity.     

Development and validation of adolescent-perceived microsystem scales: Social support,daily hassles,and involvement

Developed and validated instruments for urban and culturally diverse adolescents to assess their self-reported transactions with family, peer, school, and neighborhood microsystems for the constructs of social support, daily hassles, and involvement. The sample of 998 youth were from schools in three Eastern cities with high percentages of economically disadvantaged youth. Data were collected before and after the transition to junior high school or to senior high school. Blacks constituted 26%, whites 26%, and Latinos 37% of the sample. Factor analyses confirmed and enhanced the hypothesized four-factor microsystem factor structure for support, hassles, and involvement; internal consistency and stability coefficients were consistent with these structures. In general, the microsystem factors were common across gender, ethnicity, and age. However, when group differences did occur on these demographic variables, they tended to validate the salience of microsystem specificity. In contrast to the total scores, the microsystem-specific factors yielded more meaningful and differential information with regard to demographic differences and the mediating processes across a school transition.