Acceptability bias: The effects of treatment acceptability on visual analysis of graphed data

Vignettes depicting a mildly or severely self-abusive child with profound mental retardation who received either a differential reinforcement of other behavior or a contingent electric shock treatment were presented to 161 undergraduates. After subjects rated the acceptability of the given treatment on the Treatment Evaluation Inventory (TEI), they evaluated the efficacy of the given treatment based upon six AB data graphs. Visual analytic judgments were not significantly effected by type of treatment, severity of self-injurious behavior (SIB), or the treatment × SIB interaction. TEI scores differed significantly according to type of treatment. Simple and multiple correlations computed between TEI scores and graph evaluations provided evidence ofacceptability bias, such that more favorable appraisals of treatment acceptability were related to perceptions of greater treatment effectiveness.