Effectiveness of Environmental Manipulation to Enhance Engagement and Ecological Validity at an Agency Serving Individuals With Autism Spectrum Disorder and Other Disabilities.

The ecological validity of interventions can be enhanced when we first consider the environment in which our students participate. Antecedent interventions such as environmental manipulations can be easily and effectively implemented to enhance student engagement and decrease challenging behaviors in classrooms. The current study explored the use of a measurement system developed for widespread use within a school for students with autism spectrum disorder that helped to inform a classroom-wide environmental manipulation in the form of classroom arrangements. Baseline data across three classrooms suggested high, variable rates of challenging behavior and low rates of engagement with staff and materials. After the introduction of the antecedent intervention, engagement increased and challenging behavior decreased. Helping practitioners develop environmental and systems changes may help to complement individual behavior intervention plans.

Manipulating slot machine preference in problem gamblers through contextual control.

Pathological and nonpathological gamblers completed a task that assessed preference among 2 concurrently available slot machines. Subsequent assessments of choice were conducted after various attempts to transfer contextual functions associated with irrelevant characteristics of the slot machines. Results indicated that the nonproblem gambling group, but not the problem gambling group, increased their responding toward the slot initially trained as greater than following the initial training procedure, then decreased their responding toward that slot following the reversal phase.

Creating single-subject design graphs in Microsoft Excel 2007.

Over 10 years have passed since the publication of Carr and Burkholder's (1998) technical article on how to construct single-subject graphs using Microsoft Excel. Over the course of the past decade, the Excel program has undergone a series of revisions that make the Carr and Burkholder paper somewhat difficult to follow with newer versions. The present article provides task analyses for constructing various types of commonly used single-subject design graphs in Microsoft Excel 2007. The task analyses were evaluated using a between-subjects design that compared the graphing skills of 22 behavior-analytic graduate students using Excel 2007 and either the Carr and Burkholder or newly developed task analyses. Results indicate that the new task analyses yielded more accurate and faster graph construction than the Carr and Burkholder instructions.

Contextual control of slot-machine gambling: replication and extension.

Participants were trained and tested to select stimuli of differing physical quantities in the presence of 2 color contextual cues for more than and less than. Following more than and less than relational training, participants allocated the majority of their responses to the slot machine that shared formal properties of color with the contextual cue for more than, despite the identical payout probabilities of the slot machines.