Fig. 1.

Duration of training and recording.Horizontal bar graphs show the training period (angle hatching) and recording period (horizontal hatching) for each monkey, A, C, and G, in years. Two solid vertical lines within each monkey's recording period indicate the day on which the first and last neurons with significant effects in spike-triggered averages were recorded. (Monkey G's last neuron was recorded very close to the end of the recording period.) Thesolid black box in monkey C's training period indicates a 3 month hiatus during a lab move.