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Distraction produces an increase in pain-evoked anterior cingulate activity

Authors


  • The expert technical assistance of J. Gibbons is gratefully acknowledged. This work was supported by a grant from the National Institutes of Health (NS35810).

Address reprint requests to: Robert Dowman, Department of Psychology, Clarkson University, Potsdam, NY, 13699-5825, USA; E-mail: rdowman@clarkson.edu.

Abstract

This study examined the effects of distraction on pain-evoked activity in the anterior cingulate cortex (ACC). Twenty-eight healthy adults were given painful electrical stimulation of the sural nerve during an attend condition, where they rated the subjective magnitude of each electrical stimulus, and during a distraction condition, where they performed an arithmetic distraction task. The magnitude of the pain-evoked ACC activity was estimated from the dipole source localization analysis of the somatosensory evoked potential. Subjective pain ratings were smaller and pain-evoked ACC activity was larger during the distraction condition than during the attend condition. Recent regional cerebral blood flow studies have also reported a distraction-related increase in pain-evoked ACC activity. Our results confirm these reports, and verify that the distraction effect specifically involves pain-evoked ACC activity. The cognitive demands of the distraction task present the possibility that the pain-evoked ACC activity might be involved, at least in part, in response competition and/or orienting attention toward painful stimuli.

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