Estimation of psychometric functions from adaptive tracking procedures.

Because adaptive tracking procedures are designed to avoid stimulus levels far from a target threshold value, the psychometric function constructed from the trial-by-trial data in the track may be accurate near the target level but a poor reflection of performance at levels far removed from the target. A series of computer simulations was undertaken to assess the reliability and accuracy of psychometric functions generated from data collected in up-down adaptive tracking procedures. Estimates of psychometric function slopes were obtained from trial-by-trial data in simulated adaptive tracks and compared with the true characteristics of the functions used to generate the tracks. Simulations were carried out for three psychophysical procedures and two target performance levels, with tracks generated by psychometric functions with three different slopes. The functions reconstructed from the tracking data were, for the most part, accurate reflections of the true generating functions when at least 200 trials were included in the tracks. However, for 50- and 100-trial tracks, slope estimates were biased high for all simulated experimental conditions. Correction factors for slope estimates from these tracks are presented. There was no difference in the accuracy and reliability of slope estimation due to target level for the adaptive track, and only minor differences due to psychophysical procedure. It is recommended that, if both threshold and slope of psychometric functions are to be estimated from the trial-by-trial tracking data, at least 100 trials should be included in the tracks, and a three- or four-alternative forced-choice procedure should be used. However, good estimates can also be obtained using the two-alternative forced-choice procedure or less than 100 trials if appropriate corrections for bias are applied.     

Parental Attachment and gender-role identity

The Inventory of Parent and Peer Attachment (IPPA) and the Bem Sex-Role Inventory were given to 218 primarily middle class college students of whom 90% were Caucasian. A 2 × 4 × 2 univariate factorial analysis of variance was used to examine the association of attachment level with gender, gender-role identity, and the within subjects factor of attachment figure. Feminine and androgynous individuals reported significantly higher levels of parental attachment than those classified as masculine and undifferentiated. There were also similar multivariate differences among the gender-role categories on the IPPA subscales of Communication, Trust, and Alienation. Across all participants, attachment to mother was higher than to father. Although there were no overall gender differences in parental attachment, females reported higher peer attachment.This paper is based on a master's thesis submitted in May of 1993 to the Graduate School of Texas Woman's University. This research appeared as a poster presentation at the 1994 annual convention of the American Psychological Association.     

The effectiveness of the erratum in avoiding error propagation in physics

The propagation of errors in physics research is studied, with particular attention being paid to the effectiveness of the erratum in avoiding error propagation. We study the citation history of 17 physics papers which have significant errata associated with them. It would appear that the existence of an erratum does not significantly decrease the frequency with which a paper is cited and in most cases the erratum isnot cited along with the original paper. The authors comment on implications for the responsibilities of authors.     

Gender role perceptions of women in abusive relationships

A community sample of psychologically abused women (N = 93; 83 Anglo, 4 Hispanic, 4 African-American, 1 Native American, 1 “Other”) in 3 groups (psychological abuse only, with moderate violence, with severe violence) received payment for completing lengthy questionnaires and interviews. This study concerns women’s perceptions of their own and their partners’ gender roles and gender role attitudes. Women in all 3 groups rated themselves feminine and egalitarian, as hypothesized. Ratings of their partners were near the midpoint of the scales on masculinity and traditionalism, contrary to hypotheses. Women experiencing psychological abuse with severe violence had more negative perceptions of their partners and believed their partners had more negative views of them than did women who shared the common experience of psychological abuse but sustained less or no violence. This research was funded by Grant Number 1R29MH44217 from the National Institute of Mental Health awarded to the second author. Portions of this study were reported at the Fourth International Family Violence Research Conference, Durham, NH, July 1995. Thanks to Dr. Sue Rosenberg Zalk and two anonymous reviewers for helpful comments and suggestions.     

Structural Family Therapy

Research studies show that Chinese communities in the United States are in need of mental health services. Structural family therapy offers an effective model for treating families in need of therapy. This article describes why and how the model can be applied.     

Structure of intelligence in intellectually precocious children and in their parents

Students representing the top 0.03% of their age group in intellectual ability, who were identified by the Study of Mathematically Precocious Youth (Benbow & Stanley, 1980), were tested along with their parents using a battery of specifically designed cognitive tests. These highly intelligent children had less intelligent, but yet quite bright parents. Vernon's (1961) model of intelligence best fits our results. His following two factors explained most of the variance in the performance of the students and parents: verbal-educational and practical-spatial-mechanical. Moreover, there was potential evidence for a general factor. Among the children, who were mostly past puberty, age related to development of verbal abilities, but not spatial or mechanical abilities. Sex differences favoring the males were found on the spatial ability and mechanical comprehension tests.