Experimental psychology and the courtroom

Experimental social and cognitive psychology cover a range of topics such as attitudes, attribution, decision making, perception, memory, comprehension, and reasoning. The relevance of these topics to the law is apparent in such domains as jury selection, jury behavior, plea bargaining, eyewitness testimony, sentencing, and police investigation strategies. Despite early attempts to apply experimental psychology to law (circa 1900–1920), it was not until the mid 1970s that a robust law-relevant literature in experimental psychology began to unfold. The experimental psychology/law interface continues to experience some problems in (1) generalizing from specific research experiments to real-world conditions, and (2) identifying solutions rather than just problems.     

Memory for faces: Encoding and retrieval operations

The reliable finding that trait judgments of faces yield better recognition memory than do feature judgments of faces is conceptualized as an encoding-specificity effect. Specifically, both trait-judgment encodings of faces and face-recognition tests are argued to be holistic, involving topographical information with between-feature processing. Consistent with the concept that encoding and retrieval operations interact to produce retrieval success, it was expected that a memory-for-face test using the Identi-kit (which requires reconstructions of the face at a feature level of analysis) would show trait-encoding tasks to be inferior to feature-encoding tasks. Eighty subjects were assigned randomly to judge a face on 10 trait dimensions (e.g., honesty-dishonesty) or on 10 feature dimensions (e.g., narrow nose-wide nose) and subsequently attempted to recognize the target among five distractors or to reconstruct the face from an Identi-kit. The significant interaction between encoding and retrieval operations indicated that the face was best identified under trait-encoding conditions but best reconstructed under feature-encoding conditions. The match between trait encoding and recognition in yielding high memory performance suggests strongly that trait judgments foster holistic processing of faces (i.e., interfeature topographical information is p-art of the context) and that the recognition of faces also is holistic. Finally, the utility of the feature- vs. holistic-processing distinction is questioned, and an alternative is proposed.     

Behavioral treatment of obsessive-compulsive neurosis

Three chronic and severe obsessive-compulsive neurotics were treated with behavioral intervention strategies and psychotropic medication. The effects of treatment were evaluated in three separate experiments with single case experimental designs. The results suggest that response prevention was effective in reducing ritualistic behavior while the effects of flooding and antidepressant medication added little to outcome. The results also suggest that strategies aimed only at reducing compulsive behavior per se are insufficient in eliminating other associated difficulties (e.g., depressive symptoms, interpersonal problems) and that a comprehensive approach to treatment is needed.     

EFFECTS OF A PROCEDURE DERIVED FROM THE OVERCORRECTION PRINCIPLE ON MANIPULATED AND NONMANIPULATED BEHAVIORS

Positive practice overcorrection has been shown to be effective in reducing stereotypic self-stimulatory behaviors displayed by retarded and autistic individuals. In addition, the procedure also may increase the occurrence of appropriate behavior through intensive practice. In the present study, several stereotypic and one appropriate behavior (appropriate toy play) displayed by two autistic children were measured before and during treatment by a positive practice in appropriate toy play overcorrection procedure. Overcorrection was introduced for each of the targeted inappropriate behaviors in succession for both children. Results showed that overcorrection reduced all stereotypic behaviors displayed by both children. In addition, one subject displayed marked increases in the behavior practised during overcorrection, appropriate toy play, relative to its baseline rate of occurrence. The results indicate that for some individuals, overcorrection may be effective in teaching and motivating appropriate forms of behavior as well as in reducing stereotypy.     

Does Knowledge that a Crime Was Staged Affect Eyewitness Performance?1

The Staged crime has generally been considered a valid paradigm for assessing eyewitness identification accuracy. Yet the typical procedure informs the witness before the lineup task that the event was staged. The current study manipulated whether or not witnesses were informed that the witnessed crime was staged (information variable). Two other variables, the presence or absence of the perpetrator in the photo-lineup and the physical similarity of lineup members, were manipulated to asses any possible interactions with the information variable. A theft was staged individually for 184 unsuspecting witnesses who were then randomly assigned to be either informed that the theft was staged or not informed. Next, all witnesses were met by a uniformed security officer who showed them a photo-lineup of six individuals. Half of the witnesses viewed a perpetrator-present lineup with either high or low physical similarity between the foils and the perpatrator and half viewed a perpetrator-absent lineup with either high or low physical similarity. Three confidence measures, one cooperation measure, and an Embedded Figures Test score were obtained. The results showed that (a) the information variable did not affect the likelihood that a witness would attempt an identification; (b) the information variable did not have a main effect on the particular choices made by the witnesses nor did it interact with lineup similarity, but it did interact with the presence-absence variable; and (c) the information variable did not affect witness confidence either as a main effect or interaction effect, but, was relatively consistent in affecting the correlation between confidence and accuracy such that the correlation was lower for witnesses who were not informed. The interaction between the information variable and the presence-absence variable on accuracy was due to the uninformed witnesses being less accurate than the informcd witnesses in the perpetrator-present condition. The results suggest that accuracy among actual eyewitnesses may be lower than obtained in the typical staged crime procedure and that accuracy-confidence correlations may be overestimated by the typical staged crime.     

Effect of a reliability observer on the frequency of positive parent behavior recorded during naturalistic parent-child interactions

The purpose of the present study was to examine the effect of the presence of a reliability observer on the number of positive parent behaviors recorded by a primary observer during naturalistic parent-child interactions. Thirty parents and their young clinic-referred children served as subjects. After two initial home observations, a reliability observer was present to record data in observation session 3, but not session 4, for one-half the subjects. For the remaining subjects the reliability observer was present in session 4 but not session 3. The results of a 2 × 2 analysis of variance indicated a group by session interaction which resulted from an increase in maternal attention to the child in the presence of a reliability observer. Hypotheses to explain the finding are presented and implications of the results are discussed.This research was supported in part by NIMH Grant MH28859-01.     

The thought control questionnaire: A measure of individual differences in the control of unwanted thoughts

Previous research has suggested that unpleasant and unwanted thoughts are a frequent experience in both normal and clinical populations. This paper describes the development and validation of a questionnaire that assesses strategies for controlling such thoughts. Analyses of the Thought Control Questionnaire (TCQ) demonstrated five replicable factors: Distraction; Social Control; Worry; Punishment and Reappraisal. Significant associations were found between the punishment and worry subscales of the TCQ and various measures of emotional vulnerability and perceptions of impaired control over cognition. The implications of these findings are discussed in relation to the literature on thought suppression, worry and mental self-regulation.     

Prospective factors contribute little to within-session changes in responding

Five rats pressed levers for food delivered by a multiple variable interval 1-min variable interval 1-min schedule. In theunpredictable conditions, sessions were 20, 40, 60, 80, or 100 min long, determined randomly at the beginning of each session. In thepredictable conditions, each of these session durations was presented for 15 consecutive sessions. Rate of responding changed systematically within the session even when the end of the session was unpredictable. This implies that prospective factors related to anticipation of the end of the session are not necessary for producing withinsession changes in responding. Within-session patterns of responding were also similar for the predictable and unpredictable conditions. This suggests that prospective factors contributed little to the form of the within-session patterns under the present conditions.