Recall of familiar objects and projected color photographys of objects by mentally retarded individuals of comparable mental age.

The effects of cue-availability on short-term and long-term recall of 40 mentally retarded children were investigated. Subjects were chosen on the basis of comparable mental age (approximately 90 mo.) and randomly assigned to either an objects (high cues) group or slides (low cues) group. 52 familiar objects served as stimuli for the objects group and projected color photographs of the objects were presented to the slides group. In the short-term recall session the subjects were shown stimuli grouped into eight trials and asked to recall the names of the stimuli in each trial ten seconds after presentation. Delayed recall was obtained 48 hr. later in a free recall session. The objects group scored significantly higher than the slides group on memory span (p less than .01), short-term recall (p less than .001), and delayed recall (p less than .025). The facilitation of recall achieved by using three-dimensional stimuli was clearly demonstrated, and the relative degree of facilitation was comparable for both short- and long-term recall.     

An experiment in social engineering in serving the families of predelinquents

One hundred and two predelinquent adolescents were randomly assigned to one of two conditions: an experimental condition in which behavioral contracting services were offered both at home and in school or a control condition in which clients were told that they could not be accommodated by project therapists and were informed about the possibility of their receiving treatment in other programs in the community. Most of those who were assigned to the control condition did not avail themselves of services in these other programs. Results indicate that, relative to the controls, the behaviorally treated youth scored small but statistically significant improvement relative to the controls on five measures: ratings of school behavior by the person who originally referred them for service, by their teachers, by their mothers, and by their fathers, and ratings of their parent—child interactions as measured by their mothers. Gains were also reported in mothers' ratings of their children's behavior at home. The failure of significant gains to be made in two measures of school performance grades and attendance is explained by the failure o f the treatment techniques to over-come an age-related deterioration in these areas found among most children in the participating schools. The failure of fathers to find significant improvement in their relationships with the referred adolescents is viewed as a consequence of unanticipated changes in the intrafamilial balance of power resulting from contracting services. Finally, a subsidiary analysis showed that the contracting service appeared to offer the greatest gain to the demographically defined sub-groups of youths who are among the population-at-risk in many juvenile courts.This study was supported by Grant R01-MH21452 from the Center for Studies of Crime and Delinquency, National Institute of Mental Health. The authors wish to thank L. Nilles, who served as general administrator of this project, and C. Faller, S. Iman, P. Ippel, L. Lott, J. Marsh, C. Stephenson, J. Tanter, D. Virtue, and R. Welter, who served as therapists.     

Flooding as a function of shock level and length of confinement

In a one-way avoidance learning situation with rats, response prevention trials facilitated extinction as an increasing function of the duration of the prevention interval for shock levels below 1.8 mA. For 1.8 mA, extinction was a nonmonotonic function of the response prevention interval, with 15- and 210-sec durations showing the most facilitation of extinction. For all response prevention intervals except 15 sec, trials to extinction was a direct function of shock level. For 15 sec, it was an inverse function of shock level. The unexpected interaction of shock level with prevention interval was explained by invoking the concept of relief.     

Classical heart-rate conditioning in the rat: The influence of curare and various setting operations

Conflicting reports concerning the success of classical conditioning of heart rate (HR) in curarized animals led to an experiment using a transfer design in which rats were classically conditioned either under curarized or restrained conditions. These conditions were then reversed for each group, giving a Curarized-Restrained (C-R) and a Restrained-Curarized (R-C) group. Results indicated that curare inhibits the conditional and unconditional HR response both during initial acquisition and after asymptotic levels of a HR CR have been attained. In addition, the C-R group did not acquire a CR during their later non-curarized restrained conditioning sessions, implying an inhibitory transfer from their earlier conditioning under curare. The UCRs during this period were normal for restrained rats. Analogous experimental“setting operations” prior to restrained conditioning were then explored by a second experiment which attempted to replicate the inhibitory transfer effect. The experimental operations investigated included: (1) restrained conditioning to investigate conditioned inhibition possibilities; (2) pseudo-conditioning types of randomized CS and UCS non-paired presentations to investigate associative vs. non-associative explanations; (3) CS-Only presentations to investigate possibilities that curare creates a blockage to the UCS, thus creating an inhibiting habituation to the CS; and (4) a group receiving curarization sessions, but no conditioning, to test the drug-only transfer effects. Results from the first and second experiments together indicated no inhibitory transfer effects under any prior experimental conditions except for those animals receiving classical conditioning while curarized. Only the CS-O group demonstrated any other kind of significant transfer effect; in this case a positive transfer accelerating later conditioning due to prior CS habituation sessions. These findings were discussed within the context of existing reports of curarized conditioning and setting operation effects on later conditioning, and various potential explanations and interpretations were explored.     

Color-selectivity in simultaneous motion contrast

Thirty-two Ss were required to estimate the apparent motion of stationary vertical lines viewed against a background of moving vertical lines when both patterns were seen by the same eye (monoptic conditions) or the center pattern was seen by one eye and the surrounds by the other eye (dichoptic conditions). The stationary lines appeared to be moving from right to left as the surrounds moved left to right. The simultaneous motion contrast found under monoptic conditions was maximal when the center pattern and the surrounds were the same color and was reduced when they differed in color. The surrounds had limited influence on the apparent motion of the center section under dichoptic condition, and the color relationship was no longer important. Related color selectivity has been reported for the motion aftereffect (successive motion contrast), and both sets of data can be attributed to inlaibitory interaction (simultaneous in one case and successive in the other) among neural detectors tuned to wavelength as well as the direction of image motion.     

Stimulus dimensionality and temporal repetition

Two experiments involving temporal repetition of tachistoscopically presented visual stnnuh are reported. Experiment I employed an alphabet of four straight lines presented one, two, or four times. Experiment II employed three stimulus sets, such that the stimuli varied in size, brightness, or both, with the forms being presented either once or four times. The Ss made four-choice identification responses. Results indicate that multidomensionality is not a necessary condition for better Identification performance with multiple observations, and that this differential in favor of multiple observations persists after many, many experimental sessions.     

The manipulation of color response times in a color-word interference task

The relationship between word and color response times and color-word interference is of theoretical importance for understanding the interference phenomenon. In this experiment, color response times were manipulated by varying the size of the color-word set, but there was no corresponding change in interference. Since the manipulation of word response times consistently leads to such changes, this result has certain implications which were briefly discussed.     

Self-Confrontation and Confrontation With Another as Determinants of Long-Term Value Change1

An experiment was carried out to determine whether attempts to change values would be less successful under conditions of confrontation with a significant other than under conditions of private self-confrontation. Rokeach's value change procedure was used to induce self-dissatisfaction in two experimcntal groups, one under anonymous conditions and the other under non-anonymous, face-to-face interaction with the experimenter. The rcsults confirm previously reported findings that significant long-term changes in values can be brought about by inducing feelings of self-dissatisfaction about contradictions within one's value-attitude system. The findings also showed that changes in equality and freedom 8 to 9 weeks after the experiment were equally great under both anonymous and non-anonymous conditions compared with a control condition. The results are discussed especially in relation to their practical implications for psychotherapy.     

A Bayesian prediction of multiple-look identification performance from one-look data: The effect of unequal prior probabilities

Bayes’s theorem had accurately predicted multiple-look visual identification performance from one-look data in two previous studies when the prior probabilities of the visual stimuli were equal. In this study, prior probabilities were manipulated to determine whether these values were important in determining agreement between man and statistical man. The prior probabilities of the stimuli, four gap orientations in Landolt rings, were .7, .1, .1, and .1 for four Ss and .3, .3, .3, and .1 for three Ss. One-look data were used to predict two-look and four-look performance. In the 7-1-1-1 condition, the empirical percent correct increased as a function of repeated observations for the rare stimuli, but not for the high-probability stimuli. In the 3-3-3-1 condition, Ss improved over repeated observations for both types of stimuli. Predictions of multiple-look performance under unequal prior probability conditions in this study were less accurate than those under equal prior probability conditions in previous studies. Three possible determinants of this difference were discussed.