Robert D. Zettle

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The present research describes the development and psychometric evaluation of a second version of the Acceptance and Action Questionnaire (AAQ-II), which assesses the construct referred to as, variously, acceptance, experiential avoidance, and psychological inflexibility. Results from 2,816 participants across six samples indicate the satisfactory(More)
Dysfunctional control exerted by reason-giving in adult psychopathology is interpreted from a radical behavioral perspective. Verbal-social contingencies which support the establishment of reason-giving and its control over maladaptive actions are reviewed. A contextual approach to psychotherapy, comprehensive distancing, which attempts to weaken(More)
Depressed subjects (N = 31) were treated with three different group therapies: (a) complete cognitive therapy (CCT); (b) partial cognitive therapy (PCT); or (c) comprehensive distancing (CD). All three groups showed significant, but equivalent, reductions in depression over 12 weeks of treatment and 2-month follow-up. However, significant reductions in(More)
Several articles have recently questioned the distinction between acceptance and commitment therapy (ACT) and traditional cognitive therapy (CT). This study presents a reanalysis of data from Zettle and Rains that compared 12 weeks of group CT with group ACT. For theoretical reasons, Zettle and Rains also included a modified form of CT that did not include(More)
The effects of treatment format and client personality dimensions upon responsivity to cognitive therapy were investigated. Depressed subjects were assigned to either 12 weeks of individual or group cognitive therapy. The two formats were found to be equally effective in significantly reducing depression. Subjects were categorized at pretreatment using(More)
The degree to which experiential avoidance may represent a functional response class was examined by comparing the perseverance of participants displaying high versus low levels of experiential avoidance, as assessed by the Acceptance and Action Questionnaire (Hayes et al., 2004), during a “psychological biathlon” consisting of 2 challenging tasks that(More)
This research examined whether military service members' deployment-related trauma exposure, posttraumatic stress disorder (PTSD) symptoms, and experiential avoidance are associated with their observed levels of positive social engagement, social withdrawal, reactivity-coercion, and distress avoidance during postdeployment family interaction. Self reports(More)
Humans were presented with a task that required moving a light through a matrix. Button presses could produce light movements according to a multiple fixed-ratio 18/differential-reinforcement-of-low-rate 6-s schedule, with components alternating every 2 min. Moving the light through the maze earned points worth chances on money prizes. In Experiment 1 four(More)
Four measures of depression were administered to a normative sample (n = 44) and two psychiatric groups of adolescents (n = 40). Measures included the Adolescent Activity Checklist (AAC), Beck Depression Inventory (BDI), Automatic Thoughts Questionnaire (ATQ), and Dysfunctional Attitudes Scale (DAS). Only the BDI and ATQ were able to discriminate among the(More)