Lívia Balogh1, Pál Czobor2,3. 1. Semmelweis University, Department of Psychiatry and Psychotherapy, Budapest, Hungary balogh.livia@med.semmelweis-univ.hu. 2. Semmelweis University, Department of Psychiatry and Psychotherapy, Budapest, Hungary. 3. Nathan S. Kline Institute for Psychiatric Research, Orangeburg, NY, USA.
Abstract
OBJECTIVE: Post-error slowing (PES) is a cognitive mechanism for adaptive responses to reduce the probability of error in subsequent trials after error. To date, no meta-analytic summary of individual studies has been conducted to assess whether ADHD patients differ from controls in PES. METHOD: We identified 15 relevant publications, reporting 26 pairs of comparisons (ADHD, n = 1,053; healthy control, n = 614). Random-effect meta-analysis was used to determine the statistical effect size (ES) for PES. RESULTS: PES was diminished in the ADHD group as compared with controls, with an ES in the medium range (Cohen's d = 0.42). Significant group difference was observed in relation to the inter-stimulus interval (ISI): While healthy participants slowed down after an error during long (3,500 ms) compared with short ISIs (1,500 ms), ADHD participants sustained or even increased their speed. CONCLUSION: The pronounced group difference suggests that PES may be considered as a behavioral indicator for differentiating ADHD patients from healthy participants.
OBJECTIVE: Post-error slowing (PES) is a cognitive mechanism for adaptive responses to reduce the probability of error in subsequent trials after error. To date, no meta-analytic summary of individual studies has been conducted to assess whether ADHDpatients differ from controls in PES. METHOD: We identified 15 relevant publications, reporting 26 pairs of comparisons (ADHD, n = 1,053; healthy control, n = 614). Random-effect meta-analysis was used to determine the statistical effect size (ES) for PES. RESULTS: PES was diminished in the ADHD group as compared with controls, with an ES in the medium range (Cohen's d = 0.42). Significant group difference was observed in relation to the inter-stimulus interval (ISI): While healthy participants slowed down after an error during long (3,500 ms) compared with short ISIs (1,500 ms), ADHDparticipants sustained or even increased their speed. CONCLUSION: The pronounced group difference suggests that PES may be considered as a behavioral indicator for differentiating ADHDpatients from healthy participants.
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