Table 1.
Configuration of pulses for Expt 2
| Condition | MNS200 | CCS10 | CCS40 | Test |
|---|---|---|---|---|
| 2A | 1 mV | |||
| 2B | + | 1 mV | ||
| 2C | 75% | 1 mV | ||
| 2D | 75% | 1 mV | ||
| 2E | 1 mVMNS200 | |||
| 2F | + | 1 mV MNS200 | ||
| 2G | 75% | 1 mV MNS200 | ||
| 2H | + | 75% | 1 mV MNS200 | |
| 2I | 75% | 1 mV MNS200 | ||
| 2J | + | 75% | 1 mV MNS200 |
MNS200, right median nerve stimulation delivered 200 ms before test stimulus to elicit long latency afferent inhibition (LAI) with the intensity adjusted to produce a thumb twitch; CCS10, contralateral conditioning stimulus delivered to the right motor cortex 10 ms before the test stimulus to elicit IHI10; CCS40, contralateral conditioning stimulus delivered to the right motor cortex 40 ms before the test stimulus to elicit IHI40. Test stimulus was delivered to the left motor cortex. For Expt 3, the MNS200 pulse was reduced to 75% of that needed to produce a thumb twitch, and the CCS10 and CCS40 pulses were set at 50% of maximum stimulator output.