Table 1.

Effect of afferent cortical input on paired-TMS-pulse inhibition

AFF: afferent median nerve stimulation at 300 % perceptual threshold, preceding the magnetic test pulse by 25 ms. CS+TS: conditioning shock at 70 % resting motor threshold followed after 3 ms by a suprathreshold magnetic test pulse at the intensity indicated in the column headings. RA: resting amplitude. Arrows indicate matching response sizes in the absence of a conditioning magnetic stimulus. For statistical evaluation, the entire set of CR3 values obtained in the absence of afferent stimulation (second row : CS+TS) were compared to the set of CR3 values obtained with afferent stimulation using test stimulus intensities producing test responses of the appropriate size (fourth row: AFF+CS+TS).