Figure 12.

Effects of pairing tail position with intracellular current injections. A, B, Intracellular traces from two LF cells in which cells were made to spike (via brief intracellular current injections) at a particular time after the EOD motor command (∼20 ms) and at a particular position of the tail (30° ipsilateral) (middle traces). Before pairing (pre), both LF cells exhibited an EOCD-evoked IPSP that showed no dependence on tail position (compare left and right traces in top rows in A and B). Traces are averages of 50–60 EOCD-evoked responses. Gray outlines indicate SEM. After pairing (post), the EOCD-evoked IPSP is enhanced, and this enhancement is greater at the paired tail angle. The bottom traces, labeled EMN, are the synchronized electromotoneuron volley recorded near the tail that would normally elicit the EOD.