Figure 3.

Two examples of memory cells. (A1– 3) A memory cell. This cell is only modestly tuned in the baseline condition (A1), but becomes tuned as the monkey adapts to the force-field condition (A2). In the washout (A3) the field is turned off, but the cell's tuning curve maintains the shape acquired in the force-field condition. The waveforms plotted in the bottom left quadrants show stable recordings throughout the experimental session. (B1– 3) Another memory cell. In this case, the cell increases its average firing rate and becomes tuned in the force-field condition (B2). The tuning curve maintains the same shape in the washout (B3) as in the force-field condition.