Controlling Stroop effects by manipulating expectations for color words

An important characteristic of automatic processing is its uncontrollability. The Stroop phenomenon is regarded as a prototypical example of this characteristic of automatic processing, hence, the Stroop effect should not change when the percentages of color words versus neutral stimuli are manipulated to induce controlled processing. We found that Stroop interference decreased as the percentage of color words increased. Furthermore, the magnitude of the inhibitory component of the Stroop effect was negatively correlated with the percentage of color words; the facilitatory component was insensitive to the manipulation. These results suggest that the Stroop effect is controllable (see Logan, 1980) and that the locus of control is postlexical. The results also suggest that facilitation and inhibition are produced by different mechanisms and challenge those models of the Stroop phenomenon (e.g., Cohen, Dunbar, & McClelland, 1990; Phaf, Van der Heijden, & Hudson, 1990) that assume that a single processing mechanism causes facilitation and inhibition and that control affects facilitation and inhibition alike (Logan, 1980).     

Wise: Web Interface for Statistics Education

The Web Interface for Statistics Education (WISE) project includes a World-Wide Web site to support the teaching of introductory social-science statistics courses. The site provides easy access to data bases, archived discussion lists, electronic journals, links to other sites focused on relevant statistics topics, and it includes a prototype of an on-line tutorial. The tutorial, which is the focus of the current paper, is designed to capitalize on special capabilities offered by the Web. The easy linkage between Web pages provides support for a highly interactive tutorial, which uses “failure-based” learning and immediate feedback. Students rated the tutorial as easy to use and indicated that it would have improved their initial statistics course.     

EVALUATING MEASURES OF CONTEMPORARY SEXISM

Two recently published measures of contemporary sexist attitudes were examined and compared with a sample of 106 Canadian college students. Swim, Aikin, Hall, and Hunter's (1995) Modern Sexism scale was found to be an acceptable measure of sexist attitudes in terms of its internal reliability and its ability to predict other gender-related political attitudes. Although the Modern Sexism scale and the Neosexism scale (Tougas, Brown, Beaton, & Joly, 1995) were equally good at predicting support for the feminist movement and attitudes toward lesbians and gay men, the Neosexism scale had better internal reliability and exhibited stronger gender differences. Moreover, the Neosexism scale was superior at predicting value orientations relevant to modern prejudices.     

COLLEGE WOMEN'S FEARS AND PRECAUTIONARY BEHAVIORS RELATING TO ACQUAINTANCE RAPE AND STRANGER RAPE

Past research on women's fear of rape has focused on women's fears relating to stranger rape, even though most rapes are acquaintance rapes. In this study, 139 undergraduate women completed a questionnaire concerning their fears, precautionary behaviors, and beliefs relating to acquaintance and stranger rape. Women reported being more fearful of rape by strangers than by acquaintances, and they reported engaging in more precautionary behaviors because of fear of stranger rape than of acquaintance rape. When asked to self-generate situations in which they feared rape, they generated more situations in which they feared stranger rape than acquaintance rape. Paradoxically, they estimated that acquaintance rape was more common. Precautionary behaviors were best predicted by level of fear. A history of acquaintance rape had no effect on women's responses. Theoretical and educational implications are discussed.     

Rapid acquisition of discrete-trial lever-press avoidance: effects of signal-shock interval

Acquisition of discrete-trial lever-press avoidance learning was studied in three experiments. Experiment I compared a new training procedure, which produces rates of lever-press avoidance learning comparable to those obtained in shuttle boxes, with a “conventional”, less efficient training procedure. A factorial design was used to compare continuous versus intermittent shock and a long-variable versus a short-fixed signal-shock interval. Learning was best in the groups trained with the long and variable interval and poorest in those trained with the short and fixed interval. Type of shock had no effect. Experiment II separated the effects of duration from those of variability of the signal-shock interval. Fixed and variable intervals of 10 and 60 sec were tested and duration was the only significant factor. Experiment III addressed the effect of the differential opportunity to avoid provided by long signal-shock intervals by varying this interval from 10 to 60 sec in 10-sec steps. Only the 10-sec group showed slow acquisition relative to the others. Analysis of avoidance response latencies showed that the distributions for all groups were positively skewed and that skewness increased with increasing duration of the signal-shock interval. At intervals longer than 20 sec, the animals made progressively less use of their increased opportunity to respond. The data do not support the opportunity-to-respond interpretation of the effects of duration of signal-shock interval and suggest that some type of inhibitory process may block lever-press avoidance learning at intervals as short as 10 sec. The significance of these findings for species-specific defense reaction and preparedness theories was emphasized.