Figure 5.

Changes in proportions of item–position and position cells in learning (a) versus overtraining (b) sessions. Changes in selectivity for items during learning and overtraining sessions (c, d) and positions for the same sessions (e, f). The selectivity index was calculated using firing rates for each cell averaged across all stimulus samples. Bars represent the average ± SE proportions of cells in each 30 trial block, whereas the line shows average performance over the same trial blocks. The dotted white lines indicate average values calculated from the shuffling analyses.