PROTECTIVE EQUIPMENT AS TREATMENT FOR STEREOTYPIC HAND MOUTHING: SENSORY EXTINCTION OR PUNISHMENT EFFECTS?

We examined the effects of noncontingent and contingent protective equipment as treatment for self-injurious hand mouthing exhibited by 2 individuals with profound mental retardation. Results of a functional analysis assessment revealed that neither subject's self-injury was maintained by social reinforcement: One subject's self-injury was cyclical in nature; the other's occurred during all assessment conditions but most frequently when left alone. In the noncontingent-equipment condition, oven mitts were placed on the individual's hands at the beginning of a session and remained on throughout. In the contingent-equipment condition, the mitts were briefly placed on the individual's hands following occurrences of hand mouthing. For 1 subject, noncontingent mitts produced a large decrease in the rate of hand mouthing and contingent mitts produced similar results following a return to baseline. Hand mouthing was also reduced in the 2nd subject, but this individual was exposed only to the contingent-equipment condition (i.e., there was no prior history with the noncontingent-equipment condition). These results suggest either a punishment or a time-out interpretation rather than an extinction interpretation to account for the behavior-reducing effects of contingent protective equipment on self-injury.     

Across-Subject Generalization of Attending Behavior as a Function of Self-Regulation Training

Under investigation was the effect of a target child's regulation of his own attentive behavior upon the attentive behavior of a non-reinforced adjacent peer. Two black males, third graders from an urban elementary school, served as subjects. The target child received training in self-regulation of attentive behavior, while the adjacent peer received no training. An ABAB withdrawl design was used to assess the degree of generalization of treatment effect across subjects. During the treatment phase, the target child gave himself points contingent on his attentiveness. These points were exchanged for back-up reinforcers. For the duration of the study, the adjacent subject's increases in attentive behavior were parallelled by the non-targeted, adjacent subject's increases in attentiveness.     

The reduction of attack instigated aggression

Thirty subjects competed with an opponent in a reaction time task to avoid receiving shock. The opponent initially set only the highest possible intensity shock for the subjects. The opponent then adopted one of three strategies to reduce the intensity of shocks set by the subjects. In one condition the opponent set shock intensities which matched those set by the subject. In a second condition the opponent set shocks which were not contingent upon those set by the subject but which were identical to those set by the opponent who matched the subject's settings. The opponent in the third condition suddenly reduced the intensity of his settings and chose only the least intense possible shock for the subject. All three conditions resulted in reduced aggression. This decrement was greatest and most rapid among those subjects who were exposed to a precipitous decrease in the intensity of attack.     

Anger,Exposure to Violence,and Intragroup Conflict: A “Lab in the Field” Experiment in Southern Israel

I examine how anger stemming from violence in the Israel‐Palestine conflict influences intragroup retaliation. In July 2010 I conducted a series of experiments in two cities in the Southern District of Israel affected to varying degrees (high and low) by rocket fire from the Gaza Strip. For each experiment, subjects were partnered anonymously with a member of their community. They were then exposed to one of two emotional manipulations: one that induced anger or one that did not. Finally, each subject was given an opportunity to keep an endowment or allocate it towards destroying a portion, or all, of their partner's income (“pay to punish”) in retaliation for their partner having taken money from them previously. This decision to “pay to punish” was designed to closely mimic the costly nature of conflict. The findings suggest that anger has a conditional effect on decisions to pay to punish: in Sderot (most affected by rocket fire), anger decreases punishment, while in Ofakim (less affected), it increases punishment. Additionally, higher exposure to violence made subjects more likely to engage in negative reciprocity.     

EMPLOYING TASK ARRANGEMENTS AND VERBAL CONTINGENCIES TO PROMOTE VERBALIZATIONS BETWEEN RETARDED CHILDREN1

This study investigated the effects of arranging task events for interdependence, to increase the probability of social responding. During task interdependence, the subjects, participating in dyads and a four-person group, obtained task materials (a puzzle piece) from their partner before completing their task (appropriately placing the puzzle piece). The verbal contingency required a verbal request to precede a subject's receiving a task material from his partner. The verbal contingency yoked with task interdependence made task completion contingent on the appropriate verbalization. The findings from two experiments suggested that task interdependence was sufficient to increase partner-directed verbalizations for three of the four subjects. When the verbal contingency was added, all subjects increased their requests and other verbalizations to partner. Applied to a four-person group, the verbal contingency yoked with varying levels of task interdependence correspondingly affected the pattern and level of group communications. The greater the task interdependence, i.e., the more members each subject depended on to complete his task, the more complex the social network of verbal contacts, and the higher the level of both requests and other verbalizations for the group.     

The use of strategies and messages to alter aggressive interactions

Male and female college students were instigated to aggression by a confederate's shocks during a preliminary task. The confederate informed half of the treatment subjects of the response strategy which he intended to adopt. The other half received an irrelevant message. All subjects then competed against the confederate, who employed one of the following five response consequence strategies: a) set a maximum shock on all trials; b) set a minimum shock on all trials; c) set shocks identical to the subject's response on the preceding trial; d) set shocks two settings below the subject's response; or e) set shocks two settings above the subject's. The subject's latency to setting a shock, the intensities of the shocks set, the durations of the shock settings, and the subject's reaction times were recorded. When an irrelevant message was delivered, passive responses, well below those of the opponent, resulted in the lowest level of retaliation. In the presence of a relevant message, the match-same strategy emerged as an effective deterrent to aggressive behavior. The results were found to be consistent with predictions derived from an application of the norm of reciprocity and research demonstrating the enhancing effects achieved through the communication of existing contingencies.     

Unattainable Goal Choice as a Self-Handicapping Strategy1

Selection of an extremely difficult performance goal is conceptualized as a self-handicapping strategy–an attempt to externalize outcomes threatening one's self-image. In a laboratory study, male college students were led to believe they had succeeded at a task that was either relevant or irrelevant to their self-images. In conjunction with this, subjects were led to believe that the success they had experienced was either contingent upon or not contingent upon their effort. Consistent with a self-handicapping strategy, extremely difficult performance goals were selected on a subsequent task when success at a previous task was not contingent upon workers' e]ffort, but only in the personally relevant condition-i.e., when task performance had attributional implications for workers' s]elf-images. Personally irrelevant tasks led to a realistic downward revision of performance aspirations in response to noncontingent success.     

Superordinate goals and intergroup behaviour: The effect of role ambiguity and status on intergroup attitudes and task performance

An experiment examined the effects of role ambiguity and relative group status in an intergroup situation where a superordinate goal was salient. One-hundred-and-fifty-six subjects in groups of three undertook a cooperative task under conditions where the groups' roles were clearly Different, Similar, or not allocated (Control). In addition, the groups' perceived competence at the task was either equally High, equally Low, or unequal. Financial rewards were contingent on successful completion of the joint task. Two contrasting hypotheses were derived from Social Identity Theory: one (H1) predicted most favourable intergroup attitudes in the Control condition where lack of any clear differentiation in group roles might facilitate a superordinate identifcation. In contrast, (H2) predicted least favourable attitudes in this condition on the grounds that groups lacked a distinctive identity. Support for the second hypothesis was found since friendliness towards the outgroup decreased with increasing role ambiguity. The status variable also had consistent effects. As predicted, mutual evaluations tended to reflect the consensually agreed status differences: least bias being shown towards high status outgroups, most by high status ingroups. Task performance was also affected by role ambiguity. Judges' ratings of the group products were found to be more favourable as role ambiguity increased, in contrast to the friendliness data. The implications of these findings for Social Identity Theory, the Contact Hypothesis, and theories of group performance are discussed.     

REDUCING ESCAPE BEHAVIOR AND INCREASING TASK COMPLETION WITH FUNCTIONAL COMMUNICATION TRAINING,EXTINCTION AND RESPONSE CHAINING

The effects of functional communication training, extinction, and response chaining on 3 subjects' escape-maintained aberrant behavior were evaluated using a multielement design. Functional communication training consisted of teaching subjects a verbal response that was functionally equivalent to their aberrant behavior. Subjects initially were allowed to escape from a task contingent on the trained verbal response. In subsequent treatment phases, escape was contingent on the trained verbal response plus the completion of the specified number of steps in the task (response chaining). The number of steps was increased until a subject completed the task to obtain a break. Results showed that the treatment reduced rates of aberrant behavior and that the chaining procedure was effective in decreasing the availability of escape.     

The Effects of Task Content and Reward Contingency Upon Task Performance and Satisfaction1

A laboratory study examined the effects of task design and reward contingency upon task performance and satisfaction and upon behavioral and attributional measures of intrinsic and extrinsic motivation. Intrinsic and extrinsic motivation were defined by the task content-task consequence distinction. Both the task design and reward contingency factors were found to yield significant multivariate F ratios, but their interaction was not significant. Subjects in the contingent pay condition had higher performance quantity than those in the noncontingent condition. Subjects in the enriched task condition produced higher quality units than those in the nonenriched condition. Both contingent pay and enriched task conditons yielded higher task satisfaction and increased attributions of performance to intrinsic factors. Results were discussed in terms of cognitive evaluation theory and the distinction between intrinsic and extrinsic motivation.     

Distinct Visual Cues Mediate Aperture Shaping for Grasping and Pantomime-Grasping Tasks

The authors examined whether the top-down requirements of dissociating the spatial relations between stimulus and response in a goal-directed grasping task renders the mediation of aperture trajectories via relative visual information. To address that issue, participants grasped differently sized target objects (i.e., grasping condition) and also grasped to a location that was dissociated from the target object (i.e., pantomime-grasping condition). Just noticeable difference (JND) values associated with the early through late stages of aperture shaping were computed to examine the extent to which motor output adhered to, or violated, the psychophysical principles of Weber's law. As expected, JNDs during the late stages of the grasping condition violated Weber's law: a result evincing the use of absolute visual information. In contrast, JNDs for the pantomime-grasping condition produced a continuous adherence to Weber's law. Such a result indicates that dissociating a stimulus from a response is a perception-based task and results in aperture shaping via relative visual information.     

The Effects of Monitoring Individual and Group Performance on the Distribution of Effort Across Tasks1

This study was concerned with the mechanism(s) via which performance monitoring affects task performance. To investigate whether an individual's concerns over the evaluation of his or her performance underlie the effects of performance monitoring (independent of contingent consequences) on the distribution of effort across tasks, the study examined whether the way in which individuals performed two tasks was differentially affected by the way in which supervisors monitored performance on those tasks. Subjects working in a group setting performed two different tasks for 90 minutes, their instructions being to perform as well as possible on each task. When supervisors periodically monitored the work output of each individual within the group on one of the two tasks, subjects perceived that the supervisor was evaluating and comparing individual performance, and produced more on the monitored task at the expense of the unmonitored task. When, however, the supervisor's monitoring focused on group rather than individual products, subjects perceived that the supervisor was less likely to be able to evaluate and to compare individual performance, and their performance on the two tasks was the same, regardless of which task was monitored. Path analysis supported the interpretation that the effects of monitoring on performance were mediated by evaluation concerns associated with performance on each task.     

The impact of age on useful visual field deterioration and risk evaluation in a simulated driving task

The primary goal of this study is to evaluate whether the driver can estimate his performance and the deterioration of his state of alertness during a simulated driving task. The second goal is to study the relation between useful visual field (UVF) deterioration and the capacity to estimate performance in a visual task and the decrease of level of alertness as a function of age. In our experiment, two groups of subjects: 10 drivers between 21 and 34 years old and nine drivers between 46 and 57 years old were required to follow a vehicle in a simulated road traffic situation for 2 hours. In addition, the driver had to detect the change of colour of a signal located in the central part of his visual field or a peripheral signal appeared on the rear light of one of the vehicles in the traffic. The analysis of data collected during this visual task confirms that UVF deteriorates with the duration of the driving task and with the driver's age. The analysis of subjective data related to the state of alertness highlights an effect both of age and of the moment when this self-evaluation was carried out. However, self-evaluation of the subject's performance does not depend on driver's age. Finally, the study shows that the correlation between objective data (performance of visual task) and subjective data (state of drowsiness and self-evaluation of performance of the visual task) is low, and the implications with regard to road safety are discussed.     

“Weapons effect” revisited: Motor effects of the reception of aversive stimulation and exposure to pictures of firearms

The effect of presenting images of firearms on the speed of clenching of the fist of human subjects simultaneously receiving an aversive stimulation was studied. It was thought that, whereas the classic interpersonal experimental situation confounds the effects of the stimulus presented and several interpersonal processes, speed of fist clenching in a noninterpersonal setting could constitute a valid measure of the subject's readiness to fight. Twenty-four male and 24 female students (ages > 20 and <36 years) were instructed to press with their right hand a device commanding the projection of slides upon reception of an acoustic signal. Speed of clenching of the hand was recorded in the four conditions generated by the combination of two levels of acoustic signal (aversive and nonaversive) and two modalities of slides (firearms or tools). The results show that the reception of aversive sound accelerates fist clenching. Simultaneous presentation of slides of firearms and reception of aversive noise increases the speed of clenching of the fist. The slides' main effect was not significant. More irritable subjects tend to execute this movement faster than their less irritable counterparts, and more emotionally susceptible subjects tend to be slower than less susceptible ones. Male subjects were faster than females. This pattern of results is discussed in relation to the hypothesis formulated by the authors.     

“Handedness” and skill

The variability of handedness with different tasks is discussed. Experiments are described which show under what conditions handedness becomes evident. Tasks involving three different levels of complexity were used. The simplest task measured the accuracy with which a particular pressure could be reproduced in isometric contraction of the flexors of the index finger on each side in 21 female subjects. In the second situation, the maximum speed of making an attempted tapping movement under the same conditions, was measured in ten of the same subjects using the same muscle group alternating with its antagonists. The same ten subjects were also tested on an aiming task which provided the third level of complexity. The results suggest that differences in performance between the two sides only occur where “timing” or the serial organization of muscle activity is required and that such differences may be due to training.

Whether handedness is inherited or acquired is briefly discussed, and a second series of experiments using the same tasks as before were carried out on one female and nine male subjects. In this instance, the first two tests were used on the big toe of each side as well as the index finger. The results confirm that differences in performance between the two sides on these tasks can be adequately explained in terms of usage or training.

The hypothesis that “timing” is therefore important in the learning of any movement where serial muscle contractions arc involved was tested and confirmed in a third experimental series. The consistency of timing of the application of force in turning a crank handle at maximum speed was measured in five male subjects before and after training. The implications of the results are discussed in relation to other researches on skills.     

JFGI: FROM DISTRIBUTED COGNITION TO DISTRIBUTED RELIABILISM*

While, prima facie, virtue/credit approaches in epistemology would appear to be in tension with distributed/extended approaches in cognitive science, Pritchard ( 2010 ) has recently argued that the tension here is only apparent, at least given a weak version of distributed cognition, which claims merely that external resources often make critical contributions to the formation of true belief, and a weak virtue theory, which claims merely that, whenever a subject achieves knowledge, his cognitive agency makes a significant contribution to the formation of a true belief. But the significance of the role played by the subject's cognitive agency in distributed cognitive systems is in fact highly variable: at one extreme, formation of a true belief seems clearly to be significantly creditable to the subject's agency; at the other extreme, however, the subject's agency plays such a peripheral role that it is at best unclear whether it should receive significant credit for formation of a true belief. The compatibility of distributed cognition and virtue epistemology thus turns on what it takes for a contribution to the formation of true belief to count as significant. This article argues that the inevitable vagueness of this notion suggests retreating from virtue epistemology to a form of process reliabilism and explores the prospects for a distributed reliabilist epistemology designed to fit smoothly with distributed cognition. In effect, distributed reliabilism radicalizes Goldberg's recent extended reliabilist view (Goldberg 2010 ) by allowing the process the reliability of which determines the epistemic status of a subject's belief to extend to include not only processing performed by other subjects but also processing performed by non‐human technological resources.     

Cognitive processing of personally relevant information

Abstract

Subjects performed an idiographic, computerised version of the modified Stroop colour-naming task after having undergone a film-induced mood manipulation designed to produce either anxiety, elation, or a neutral mood. The Stroop stimuli were words related either to the subject's positive current concerns (e.g. goals, interests), to the subject's negative current concerns (e.g. personal worries), or to neither. The results indicated that words strongly related to subject's positive as well as to negative current concerns produced significantly more Stroop interference than did words unrelated or weakly related to their current concerns. Although the films strongly influenced the subjects' moods in predicted directions initially, mood changes were largely not maintained throughout the experiment. Thus, it is not surprising that no significant interactions with word type were found. These results indicate that the “emotional Stroop effect” occurs in normal subjects as well as in anxious patients, and occurs with positive as well as with negative material of strong personal relevance.     

Effects of perceived scrutiny on participant memory for social interactions

It is well known that passive audiences can impair performance on all but the simplest of tasks. The present research asked whether audience impairment effects occur as well when performers do not know, but only imagine that they are being watched, when performers are interacting with rather than merely being observed by the “audience,” and when the performance in question is one to which the audience has no access—namely, the encoding of information exchanged in a dyadic interaction. The hypothesis was that worry about being evaluated interferes with effective information processing, but only for time periods during which one of two interactants entertains distracting thoughts about the other person's possible scrutiny. To model this situation, pairs of unacquainted university students were asked to exchange opinions over a “TV phone.” On some trials one subject's image appeared on both monitors, on some trials the other subject's image appeared on both monitors, and on some trials both monitors were blank. In subsequent unanticipated recognition memory tests, participants remembered fewer of the opinions expressed during time periods when their own image was shown. This occurred even when nothing about participants' overt behavior affected the memory of observers, even when the TV images were supposedly incidental to the task, and even when the periods of scrutiny occurred at random 15-sec intervals, but the effect was limited to subjects who worry about the impression they make, and to time periods when their image was available to the other participants (not just to themselves).     

THE EFFECT OF MODELLING ON DRINKING RATE

Three male college seniors were asked to drink beer at their normal rate in a simulated tavern setting. Each was paired with a confederate, also a male college senior, in an ABACA single subject design. In the baseline conditions, the confederate matched the drinking rate of the subject. Baseline and all subsequent conditions were continued in 1-hr sessions until a stable drinking rate was achieved. In Condition B, the confederate drank either one third more or one third less than the subject's baseline rate. In Condition C, the direction was reversed. All three subjects closely matched the confederate's drinking rate, whether high or low. All subjects reported they were unaware of the true purpose of the study.     

Research Artifacts and the Social Psychology of Psychological Experiments

In psychological research with human subjects, experimenters need to anticipate potential artifacts that may be attributable to the social context of such research. Called research artifacts in this review, they are essentially uncontrolled, systematic errors (or biases) that threaten the degree of validity of statements made about whether changes in one variable result in changes in another variable. This discussion focuses on a proposed Markov‐like model emphasizing three mediating variables that operate in a theoretical chain of events. One variable refers to the likelihood of the subject's receptivity to task‐orienting cues (called demand characteristics), or incidental hints about the experimenter's expectations. A second variable refers to the likelihood of the subject's motivation (or willingness) to comply with those cues or hints. A third variable refers to the likelihood of the subject's capability of responding in accordance with the cues or hints. These three variables are discussed along with strategies that researchers can use to break the chain of events.