Motivational slow negative potential shift (CNV) related to thalamotomy.
The alteration of cortical electrical activity induced by imperative stimulation following warning stimulation, contigent negative variation (CNV), and psychological changes following thalamotomy for relief of intractable pain (CM) and tremor (VL) are studied, since CNV has a close relationship with the degree of psychological activity. Ventrolateral thalamotomy does not have any effect on the amplitude of cortical CNV, but the ventromedioposterior part of the centre median has a generating action of CNV in itself and it has facilitatory effects upon cortical CNV. According to these results, the effective mechanism of centre median thalamotomy for relief of intractable pain is caused by suppression of attention and expectancy for exogenous stimuli following lesions of the centre median.
D003265:Contingent Negative Variation; D004594:Electrophysiology; D006801:Humans; D013788:Thalamus / Q000502:physiology / Q000601:surgery*