Observing response acquisition: preference for unpredictable appetitive rewards obtained under conditions predicted by DMOD

In five E-maze experiments, rats were given a choice between receiving reward and nonreward in a situation where stimuli were correlated with reward outcome (predictable situation) versus one where the stimuli were uncorrelated with reward outcome (unpredictable situation). Preference for the unpredictable situation occurred under the following conditions: (a) small (one 37-mg pellet), immediate rewards; (b) small, delayed (15 s) rewards, if the cues correlated with reward outcome were absent during the delay interval; (c) large (15 pellets), immediate rewards if a difficult discrimination was required; and (d) if the stimulus predicting nonreward was present at the choice point. Preference for the predictable situation was strongest if reinforcement was delayed and large or the stimulus predicting reward was present at the choice point. A weaker preference for the predictable situation occurred if reinforcement was immediate and large and a simple discrimination was required or if reinforcement was large and delayed and the cues that correlated with reward outcome were absent during the delay interval. The results support the predictions of DMOD (Daly modification of the Rescorla-Wagner model), a mathematical model of appetitive learning (Daly & Daly, 1982).     

Cognitive-affective stress propensity: A confirmatory factor analysis of stress propensity measures

A cognitive-affective stress propensity (CASP) construct is used to integrate previous findings regarding individual differences in experienced stress and resultant strain. A confirmatory factor analysis determined the structure of the CASP construct using a one factor model. This model and alternative models of factor structure contain two additional new constructs, psychological magnification and cognitive-affective connectivity. These two variables, and five trait variables previously identified as moderators in stress propensity research, were used in the analysis. Results show the one factor model to fit the data better than alternative models, thus supporting the notion of a latent construct (CASP).     

A longitudinal evaluation of prevalent negative beliefs about residential placement for troubled adolescents

To investigate the validity of five prevalent negative beliefs about residential placement, we followed adolescents from a residential program and a comparison group at 3-month intervals for 4 to 8 years. This residential program in the Midwest uses the Teaching-Family Model in which six to eight adolescents live in a family-style environment. The interviews included five scales reflecting youths' views about important aspects of their lives in placement: (1) Delivery of Helpful Treatment, (2) Satisfaction with Supervising Adults, (3) Isolation from Family, (4) Isolation from Friends, and (5) Sense of Personal Control. Hierarchical linear modeling allowed us to estimate group differences while controlling for developmental trends, demographic factors, and prior differences between groups. The two groups were equivalent on all scales before the study. During the following placement, however, the treatment group's ratings were significantly more positive than the comparison group on four of the five scales and approached significance on the fifth. These findings suggest that negative beliefs about life in residential placement for adolescents may not apply to all programs.The authors acknowledge Gaylon Oswalt, Beth Chmelka, and Brian Noss for their assistance on this study and Richard Dangel, Thomas Dows, Robert Hawkins, Kathleen Lenerz, Kevin Moore, James Whittaker, and Montrose Wolf for helpful comments on this paper.     

Relationship factors in the treatment of sexual dysfunction

The role of marital harmony in the development, assessment and treatment of sexual dysfunction is addressed in the present study. Twelve couples with mixed sexual dysfunctions received both sex therapy and marital therapy in a balanced cross-over design. The major variables investigated were therapy outcome on measures of sexual satisfaction and marital adjustment as a function of treatment modality (sexual or marital) and relationship functioning. Findings showed significant differences in outcome between treatment approaches with a strong mediating effect of relationship factors. Limited interpersonal understanding and inaccurate perceptual agreement in relationship functioning characterized those couples who failed to exhibit a differential response to treatment in favour of sex therapy over marriage therapy. Implications of these findings for the assessment and treatment of sexual dysfunction are discussed.     

Influence of stuttering therapy on clinicians'' disfluencies: Effects of client modeling

This study investigated whether student clinicians working with stutterers subsequently produce more disfluencies than student clinicians providing therapy to clients with other speech and language disorders. Seventeen graduate students working in a 6-wk summer camp setting were divided into two groups: eight who provided treatment for stutterers (group 1) and nine who provided therapy for clients with other communication disorders (group 2). All student clinicians were recorded during spontaneous speaking and oral reading tasks prior to camper arrival and following camper departure. An eight-category classification system was used to determine disfluency types. Findings revealed that Group 1 clinicians significantly decreased their total disfluencies between pre- and post-camp recordings on the spontaneous speaking task. Unexpectedly, this same group also substantially increased part-word repetitions and sound prolongations. The possibilities of incidental learning, reverse modeling, and overidentification with stuttering clients are discussed.     

A BRIEF EXPERIMENTAL ANALYSIS FOR IDENTIFYING INSTRUCTIONAL COMPONENTS NEEDED TO IMPROVE ORAL READING FLUENCY

Brief experimental analyses of oral reading fluency were conducted with 4 participants who had been referred by teachers and parents for reading problems. The procedures involved the sequential application of reading interventions to improve students' oral reading fluency. Following a baseline condition, instructional treatments were combined with prior conditions until there was improvement in oral reading fluency in the instructional passages and passages with high content overlap. Differentiated response patterns, assessed via a multielement design, were obtained for all participants. Results are discussed in terms of the potential benefits and limitations of conducting brief experimental analyses for selecting reading interventions.     

A comparison of three interventions for increasing oral reading performance: Application of the instructional hierarchy

The instructional hierarchy is a behavior-analytic model that links level of academic skill development (i.e., acquisition, fluency, generalization, adaptation) with appropriate instructional techniques. The present study used the instructional hierarchy to compare the effects of three instructional interventions (listening passage preview, subject passage preview, and taped words) on subjects' oral reading performance on word lists and passages. Subjects were 4 male students with learning disabilities who ranged in age from 8 years 10 months to 11 years 11 months. A multielement design was used to compare the effects of the three interventions to each other and to baseline. Results indicated that the listening passage preview intervention (which contained modeling, drill, and generalization components) produced the largest performance gains. The implications of these results for selecting academic interventions based on the instructional hierarchy are discussed.