On the displacement of leisure items by food during multiple-stimulus preference assessments

Previous studies have demonstrated that when food and leisure stimuli are combined in multiple-stimulus preference assessments, individuals typically select food more often, although the leisure stimuli also have known reinforcing properties. The purpose of the current study was to replicate this effect and determine its durability by examining the effect after mealtimes. Four adults who had been diagnosed with severe mental retardation were given three initial multiple-stimulus (without replacement) preference assessments (i.e., food, leisure stimuli, and combined). All participants selected food items as the most preferred stimuli in the combined assessments. Combined assessments were then administered immediately before and after the evening meal for each participant for 1 week. The results showed similar data both before and after mealtimes.     

ESTABLISHING OPERATIONS AND REINFORCEMENT EFFECTS

Positive reinforcement procedures have had a major impact on educational programs for the developmentally disabled; nevertheless, variation in reinforcer effectiveness both within and across individuals is a common phenomenon. This study examined one class of variables—establishing operations—that might influence the effectiveness of reinforcers. Five developmentally disabled adult males participated. Responding on one of two motor tasks—switch closure or block placement—was assessed during baseline, satiation, and deprivation conditions with respect to three classes of consequences: small food items, music, and social praise. Deprivation and satiation conditions were constructed so as not to alter significantly the normal course of events in a subject's day. For example, food deprivation entailed scheduling sessions just prior to a subject's regular lunch, and social deprivation involved limiting a subject's access to social interaction for 15 minutes, during which time the subject had access to an assortment of other activities. Results showed that each stimulus class functioned as reinforcement with different degrees of effectiveness during satiation versus deprivation conditions. These results are discussed in light of previous research on enhancement of reinforcer efficacy as well as the assessment and identification of functional reinforcers, and implications are presented for future research and client habilitation.     

A preliminary examination of the evocative effects of the establishing operation

We attempted to isolate the evocative effects of the establishing operation for positively reinforced problem behavior with 2 participants. The study consisted of three phases. First, a functional analysis identified tangible items (Participant 1) and attention (Participant 2) as maintaining problem behavior. Second, access to tangible items and attention was systematically controlled (continuous access vs. no access) immediately prior to functional analysis sessions in which these consequences were delivered contingent on problem behavior. Results of this phase indicated that problem behavior occurred at higher levels when access to tangible items and attention was restricted. In the third phase, prior access was again controlled, but problem behavior produced no consequences. Results of this final phase indicated that problem behavior occurred at higher levels during extinction sessions when participants did not have prior access to the reinforcers.     

Life Design Counseling: A study on client's operations for meaning construction

This study evaluated the adequacy of the micro-theory of client operations to explain meaning construction during Life Design Counseling. Four adolescents were interviewed about their second counseling session. Their recollections were stimulated through the replay of counseling videotapes. The resulting transcribed interviews were qualitatively analyzed. Results confirmed a sequence of client operations evolving from the symbolic representation of experience and reflexive self-examination towards making new realizations and revisioning self. Moreover, clients reported negative and positive session moments evidencing that clients' attention and activity during the session was not restricted to meaning construction operations. Practical implications for life design counseling are derived from the results and discussed.     

Motivating Operations Affect Stimulus Control: A Largely Overlooked Phenomenon in Discrimination Learning

Several recent studies have explored what Michael (e.g., 1982) termed the value-altering effect and the behavior-altering effect of motivating operations. One aspect of the behavior-altering effect that has garnered no recent attention involves changes in stimulus control produced by motivating operations. To call attention to this aspect of the behavior-altering effect, we herein review 11 studies that are concerned with the influence of varying levels of food or water deprivation on stimulus generalization. These studies suggest that motivating operations influence stimulus control (a) by changing the evocative strength of not just an established discriminative stimulus, but also of stimuli that are physically similar to it; (b) by changing the range of stimuli that evoke the operant in question; and (c) by exerting these effects in a graded fashion. These findings are potentially of conceptual and applied significance, and it appears that further research examining how motivating operations alter stimulus control, including some studies suggested herein, is warranted.     

USAF Special Tactics Operator Combat Exposure and Psychological Stress

Given the length of combat in Afghanistan, Iraq, Syria, and elsewhere, and the role special operations forces will continue to play, we believe it is imperative to gain understanding of the psychological “wear and tear” associated with sustained combat operations on these highly specialized, highly utilized personnel. This study focused on a seldom-studied group, Air Force Special Tactics (ST) operators, to assess combat exposure, current psychological stress, and preferences for support when needed. This study assessed symptoms of posttraumatic stress, depression, anxiety, sleep, anger, and perceptions of help seeking in 5 ST units. Data revealed that the majority of study participants report distress levels below clinical thresholds; however, 26% struggle with generalized stress/agitation and, at smaller percentages, other distress symptoms that have negative impact on work performance. Combat experiences were comparable or higher than Army and Marine maneuver forces, and greater amounts of exposure related to positive screening for a possible mental health disorder, generalized agitation, and posttraumatic symptoms; combat involving direct fighting and being in high-threat situations were also related to posttraumatic stress. Distress rates for Special Operations Weather personnel were higher. Attitudes toward mental health support were positive however, embedded assets were preferred over base clinic providers. We review these and other findings and offer suggestions for future research in this area.     

Moral Stress in International Humanitarian Aid and Rescue Operations: A Grounded Theory Study

Humanitarian aid professionals frequently encounter situations in which one is conscious of the morally appropriate action but cannot take it because of institutional obstacles. Dilemmas like this are likely to result in a specific kind of stress reaction at the individual level, labeled as moral stress. In our study, 16 individuals working with international humanitarian aid and rescue operations participated in semistructured interviews, analyzed in accordance with a grounded theory approach. A theoretical model of ethical decision making from a moral stress perspective was developed. The practical implications of the study are discussed.     

Provitamin A Selection by Vitamin A Depleted Rats

G. T. scores on the Army General Classification Test (AGCT) as indicants of intelligence were correlated with scores on the Creative Imagination Test (CIT) for two groups of men differing on intelligence. Results supported the prediction of closer correspondence of intelligence and creativity scores in a low intelligence range (r = .437, p < .01) than in a high intelligence range. Intelligence was unrelated statistically to creativity (r = .10) when only the high intelligence range above 111 was considered. Guilford's triagular scatterplot conceptualization of intelligence-creativity relationship seemed most congruent with the present and earlier data. Intelligence was described as allowing the development of creativity, but not insuring such development. Personality and environmental factors may be important in creativity expression especially at upper intelligence ranges.     

The effects of variable-time delivery of food items and praise on problem behavior reinforced by escape

Prior research indicates that reinforcement of an appropriate response (e.g., compliance) can produce concomitant reductions in problem behavior reinforced by escape when problem behavior continues to produce negative reinforcement (e.g., Lalli et al., 1999). These effects may be due to a preference for positive over negative reinforcement or to positive reinforcement acting as an abolishing operation, rendering demands less aversive and escape from demands less effective as negative reinforcement. In the current investigation, we delivered a preferred food item and praise on a variable-time 15-s schedule while providing escape for problem behavior on a fixed-ratio 1 schedule in a demand condition for 3 participants with problem behavior maintained by negative reinforcement. Results for all 3 participants showed that variable-time delivery of preferred edible items reduced problem behavior even though escape continued to be available for these responses. These findings are discussed in the context of motivating operations.