An introductory statistics class and examination using SPSS/PC

SPSS/PC was integrated into lecture and an examination in introductory statistics. Students were given an anonymous questionnaire after a traditional examination and again after an examination with SPSS/PC. They wanted more theory and derivation and were ambivalent about SPSS/PC in lecture. The computer test decreased computational error fears. Students preferred the more realistic questions which the computer permitted. Test performance was not significantly different. The results suggest that statistical packages should be used in later courses rather than in introductory statistics.     

Error patterns in judgment and production of horizontal and vertical scale positions

Cyclic error curves are often found when people judge or set the position of a marker on a linear scale, but various different forms of cyclic pattern have been reported. Twelve subjects each made judgments and also made settings, both on a horizontal linear scale and on a vertical one. Analysis of their error patterns showed a strong tendency to generate the opposite pattern when the response mode changed from judgment to production of scale positions. This is interpreted as evidence that the errors arise from perceptual misjudgments rather than from response biases. Error patterns tended to remain constant for changes in scale orientation alone. Thus, the varying scale orientations do not seem to account for the reported discrepancies in pattern. However, it was found that different subjects could have opposite patterns in the same experimental condition. These were real individual differences because subjects’ patterns tended to persist across changes in orientation and to reverse with changes in response mode. It seems likely that the reported differences in pooled error trends reflect different assortments of subjects who differ fundamentally in their perception of linear scale positions.     

The effects of tempo and familiarity on children's affective interpretation of music

When and how does one learn to associate emotion with music? This study attempted to address this issue by examining whether preschool children use tempo as a cue in determining whether a song is happy or sad. Instrumental versions of children's songs were played at different tempos to adults and children ages 3 to 5 years. Familiar and unfamiliar songs were used to examine whether familiarity affected children's identification of emotion in music. The results indicated that adults, 4 year olds and 5 year olds rated fast songs as significantly happier than slow songs. However, 3 year olds failed to rate fast songs differently than slow songs at above-chance levels. Familiarity did not significantly affect children's identification of happiness and sadness in music.     

The Structure and Nature of the Broader Autism Phenotype in a Non-clinical Sample

The broader autism phenotype (BAP) is a subclinical behavioral phenotype that is qualitatively similar to autism spectrum disorders (ASDs). Research on the BAP has used different conceptualizations of this construct. To more closely approximate the nature of the BAP, the current study utilized traditional construct validation methods to identify the BAP structure and characterize its nomological net in undergraduates. A conjoint exploratory factor analysis of the scales from three self-report measures of the construct was used to derive three robust BAP dimensions reflecting pragmatic language difficulties, aloofness, and rigidity. These dimensions were then correlated with theoretically-relevant personality, psychopathology, and interest variables in order to evaluate the criterion validity of the BAP. Correlations were generally consistent with our predictions and showed strongest relations between BAP dimensions and poor communication skills, impaired social functioning, and behavioral and cognitive rigidity. This research represents a first step in the identification and utilization of a common conceptualization of the BAP.     

Counseling and Guided Self‐Help Outcomes for Clients With Bulimia Nervosa: A Meta‐Analysis of Clinical Trials From 1980 to 2010

This meta‐analysis included 111 clinical trials exploring the effectiveness of counseling/psychotherapy and guided self‐help approaches in the treatment of bulimia nervosa. In general, single‐group studies supported higher efficacy of counseling/psychotherapy, whereas wait‐list, treatment‐as‐usual, and placebo studies indicated both approaches were equally effective at termination (posttest) and follow‐up in altering binging, purging, laxative use, and self‐reported bulimia or body dissatisfaction perceptions in nearly all comparisons.