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Cerebellar responses during anticipation of noxious stimuli in subjects recovered from depression. Functional
K A Smith1, A Ploghaus, P J Cowen
1University Department of Psychiatry, Warneford Hospital, Oxford, UK.
Background:
Subjects recovered from depression have a substantial risk for recurrence of depression, suggesting persistent abnormalities in brain activity.
Aims:
To test whether women recovered from depression show abnormal brain activity in functional magnetic resonance imaging (fMRI) during a conditioning paradigm with a noxious pain stimulus.
Method:
Ten unmedicated women who had recovered from major depression and eight healthy control women each received either noxious hot or non-noxious warm stimuli, the onset of which was signalled by a specific coloured light during 3-tesla echo planar imaging-based fMRI.
Results:
Similar patterns of brain activation were found during painful stimulation for both patients and healthy controls. However, relative to healthy controls, subjects recovered from depression showed a reduced response in the cerebellum during anticipation of the noxious stimulus compared with anticipation of the non-noxious stimulus.
Conclusions:
Our data suggest that abnormal cerebellar function could be a marker of vulnerability to recurrent depression. This could provide a new target for therapeutic interventions.
