Response times to Ehrenstein illusions of varying subjective magnitude: complementarity of psychophysical measures

The following experiments investigate the effects of contrast polarity, inducer spacing, and inducer type on three dependent variables measuring the perception of an illusory surface in Ehrenstein figures: subjective magnitude, response time, and frequency of perception. It was found that response time generally decreased when the other two behavioral indicators increased. However, it was also shown that subjective magnitude provided more discriminating measures of relatively strong illusory percepts, whereas frequency of perception and response time provided more discriminating measures of relatively weak illusory percepts. The findings generally confirm earlier work on the effect of inducer spacing and contrast polarity on the perceived strength of brightness illusions, and in particular reveal the complementarity of subjective magnitude, response time, and frequency of perception as critical measures of configurational effects in the perceptual processing of these phenomena. Thanks are due to J. E. Hoffman, T. Parks, and an anonymous referee for their insightful comments and suggestions on an earlier version of this paper.     

Expectancies for social contingency in 2-month-olds

In a classic report, Murray and Trevarthen (Emotional regulation of interaction between two-month-olds and their mothers. In T. Field & N. Fox (Eds), Social perception in infants (pp. 101–125). Norwood, NJ: Ablex, 1985) suggested that 6- to 12-week-olds were sensitive to contingency in maternal stimulation because they became upset during the replay of their mothers’ behavior during an initial period of live interaction over closed circuit TV. However, a number of concerns were raised about the procedure and it was argued that infants may simply have become increasingly fussy over time. To clarify this very important issue, we adopted a three-condition design (live–replay–live) and modified Murray and Trevarthen’s procedure by inserting a seamless shift from the initially live interaction period to a replay period of good maternal behavior. This was followed by a seamless shift back to a subsequent live interaction. Two-month-old smiling and gaze decreased while frowning and mouth closures increased during the replay period relative to the initial live interaction period, replicating Murray and Trevarthen’s results. Fussiness over time did not account for these results because seven of the ten babies increased their positive behaviors and decreased negative behaviors during the second live interaction period, and there was a significant increase in their visual attention to their mothers, thus suggesting a renewed interest in the previously noncontingent partner.     

Global Change: New Challenges for Psychology

Perception of environmental degradation and awareness of environmental hazards came gradually, and was followed by collective action. Global change is different because of its specific features, which raise new issues for action-oriented psychological research. The lack of consensus among scientists, the global nature of the change, and the type of risk are analysed in order to develop an agenda for research. Priority should be given to acquiring a better knowledge of the cognitive process in the face of serious danger with a high margin of uncertainty.     

An improved respiratory system for curarized rats

A respiratory system is described in which peak expired CO₂ is continuously monitored from curarized rats. Another alteration from previous systems is that an endotracheal tube is used to minimize dead air space. The adequacy of the system was tested by maintaining curarized rats at one level of peak expired CO₂ for varying periods of time and by keeping rats at different peak expired CO₂ levels for a fixed period of time. Results of blood gas analyses indicated that values obtained with this system are similar to values in noncurarized rats, and that manipulation of expired CO₂ is an effective means of altering blood gas values.     

Interactions between spatial and kinetic dimensions in movement aftereffect

In some conditions, the surface of the test figure on which one sees an aftereffect of movement does not fit with that part of the visual field previously adapted to a movement. Such an effect, called kinetic-figural effect, may be conceived of as resulting from an interaction between two perceptual systems, each one giving specific information: one for the kinetic aspects which are spatially defined, the other for the spatial relationship inside the visual field. Experiments are presented which indicated the validity of a “law of location” for a movement aftereffect, together with some effects of the spatial relationships between adapting and test fields upon the movement aftereffect.     

Marriage preparation and marriage enrichment: The preventive approach

Premarital counseling and marriage enrichment are viewed as two areas of a life continuum prevention program. Premarital counseling is seen as the first step in preparation for marriage, to be followed six months to a year after marriage by a neomarital counseling experience. Content and process for the counseling are elaborated. Marriage enrichment groups are recommended at various points during the life of a marriage. Three models for enrichment are presented. Prevention programs are viewed as vital experiences for personal and relationship maintenance and growth.He is also a member of the faculty of Waterloo Lutheran Seminary, Waterloo, Ontario.     

Modification of Delinquent Behavior1

A matched subjects design was employed to assess the effectiveness of an experimental program for the reduction of delinquent behavior in adolescent boys on probation. Youngsters in the experimental group (N= 19) were invited to participate in a series of small group sessions designed on the basis of principles drawn from the theory and research of social psychology. Control group delinquents (N= 19) were not informed of this project and continued their previous association with the probation office. The group experiences arranged for the experimental participants encouraged free and open discussion of their previous delinquent activities, future behavioral intentions, personal values, and life goals. It was found that participants developed high attraction toward the group and involvement in its activities. Frequency of subsequent delinquent behavior was found to be significantly reduced for experimental group participants as compared with their matched controls. In a followup interview 9 months after the last group meeting, it was found that experimental group members showed significantly more internal responses on a modified version of the Rotter I-E scale than did the control subjects.     

Achievement goals and engagement in individual and collective learning activities

The relationship between achievement goals and individual and collective learning activities was examined for 290 university students who completed two questionnaires. One assessed three achievement goals-a mastery goal and two performance goals, namely, approval seeking and advancing. The other questionnaire measured how actively students report engaging in individual and collective learning activities. Regression analyses showed that the adoption of mastery goals was associated with active engagement in both individual and collective learning, while adoption of a performance goal of approval seeking was associated with passive engagement in individual learning activities. These results are discussed in relation to their theoretical implications and in regard to the possible moderating effect of protecting self-worth.