Title

Caffeine effects on resting-state electrodermal levels in AD/HD suggest an anomalous arousal mechanism

RIS ID

53650

Publication Details

Barry, R. J., Clarke, A. R., McCarthy, R., Selikowitz, M., MacDonald, B. & Dupuy, F. (2012). Caffeine effects on resting-state electrodermal levels in AD/HD suggest an anomalous arousal mechanism. Biological Psychology, 89 (3), 606-608.

Abstract

The effect of a single oral dose of caffeine was examined in a randomised double-blind placebo-controlled repeated-measures cross-over study. Eighteen children with AD/HD, aged between 8 and 13 years, were individually age- and gender-matched with a control group. All children participated in two sessions, one week apart. Skin conductance level (SCL) from a 3 min eyes-closed epoch, commencing 30 min after ingestion of caffeine or placebo, was examined. Across conditions, mean SCL was lower in the AD/HD group than controls, confirming hypoarousal in AD/HD. Caffeine produced an increase in SCL, and this increase did not differ between the groups. However, arousal increases were dose-dependent in controls, but not in AD/HD. Rather, caffeine-induced arousal increases in the AD/HD group were positively related to their hyperactivity/impulsivity levels. This suggests an anomalous arousal mechanism in AD/HD functionally related to impairment in one symptom dimension.

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Link to publisher version (DOI)

http://dx.doi.org/10.1016/j.biopsycho.2012.01.004