Measuring the effect of cognitive defusion using the Implicit Relational Assessment Procedure: An experimental analysis with a highly socially anxious sample

Naoko Kishita, Takashi Muto, Tomu Ohtsuki, Dermot Barnes-Holmes

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

The current study tested the validity of the Implicit Relational Assessment Procedure (IRAP) as a tool for clinical assessment. Twenty-four students with high social anxiety were randomly assigned to either cognitive defusion or control conditions. Participants completed a self-report measure of the believability of anxiety-related thoughts and the Anxiety IRAP before and after the interventions. Significant decreases in response latency on the IRAP for both consistent and inconsistent trials were found only in participants in the cognitive defusion condition. We suggest that narrow and inflexible responding (i.e., fusion) interferes with behavioral fluency in both consistent and inconsistent blocks of the implicit measure, and thus a defusion intervention reduced response latencies in both types of blocks. In the control condition, however, we found a reduction in response latencies only for the inconsistent blocks, due to practice that occurred in the absence of a floor effect. The self-report believability measure, which produced effects for both the defusion and control conditions, showed a larger effect size for the control condition. Our results suggest that future studies that seek to analyze the impact of defusion interventions, and the psychological processes involved, employ a range of measures such as the IRAP, with a particular focus on separating out the effects of the therapeutic intervention from possible practice effects.

Original languageEnglish
Pages (from-to)8-15
Number of pages8
JournalJournal of Contextual Behavioral Science
Volume3
Issue number1
DOIs
Publication statusPublished - 2014 Jan

Keywords

  • Acceptance and commitment therapy
  • Cognitive defusion
  • Implicit relational assessment procedure
  • Relational frame theory
  • Social anxiety

ASJC Scopus subject areas

  • Health(social science)
  • Ecology, Evolution, Behavior and Systematics
  • Applied Psychology
  • Organizational Behavior and Human Resource Management
  • Behavioral Neuroscience

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