RECOVERY FUNCTIONS OF EARLY CORTICAL MEDIAN NERVE SSEP COMPONENTS - NORMATIVE DATA

The recovery functions of parietal P14-N20, N20-P27 and frontal P22-N3 0 amplitudes were assessed in 17 healthy controls aged 20-50 years by means of the paired stimulus technique. One unpaired and 4 paired stim uli with interstimulus intervals (ISIs) of 25, 50, 75 and 100 msec wer e cyclically presented in a single run. Responses to the unpaired stim ulus were subtracted off-line from paired stimulus responses. The high est suppression was reached at shorter ISIs for components with shorte r latencies. The mean suppression of P22-N30 was influenced by the sub ject's age, being greater in younger subjects. Normative data are repo rted.