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The Edinburgh cohort of HIV-positive drug users: the relationship between auditory P3 latency, cognitive function and self-rated mood

  • V. G. Egan (a1), A. Chiswick (a1), R. P. Brettle (a1) and G. M. Goodwin (a1)
Synopsis

One hundred and six HIV-positive drug users were tested with a two-tone auditory evoked potential (AEP) task and a small battery of neuropsychological tests, to examine the relationship between the latency of the P300 component (P3) of the AEP, intellectual function, mood and drug use. Principal components analysis revealed a significant correlation between P3 latency and the first principal component (r = −0·43, P < 0·001). Varimax rotation generated three orthogonal components which we interpreted as intellectual performance, memory, and mood. Intellectual performance and self-reported mood were individually correlated with P3 latency, but memory was not (r = −0·36, P < 0·001; r = 0·23, P < 0·05; and r = −0·18, NS, respectively).

Subjects with symptomatic HIV disease had a higher correlation between P3 latency and intellectual performance than subjects with asymptomatic HIV disease and, among patients with symptomatic HIV disease, poorer memory was associated with a lower CD4 count. Opiate or benzodiazepine consumption did not correlate with poor intellectual performance, memory, or selfrated mood in our sample. These results indicate that there is a relationship between AEP latency and neuropsychological measures of intellectual function, and that it is influenced by subjective mood. Surprisingly, declared current drug use has no discriminable effect on these relationships.

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Corresponding author
1Address for correspondence: Dr Guy M. Goodwin, MRC Brain Metabolism Unit, Royal Edinburgh Hospital, Morningside Park, Edinburgh EH10 5HF.
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Psychological Medicine
  • ISSN: 0033-2917
  • EISSN: 1469-8978
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