Figure 4.

Abstract relative-distance coding based on stimulus order. This PA neuron encoded whether S1 or S2 had been farther from the reference point, with a preference for S2 farther. A, Trials with stimuli up and down from reference combined. B, Trials with S2 farther divided by position up and down from the reference point. Note that there is no effect of the position of S2 on the neural activity, which indicates abstract encoding of the relative distance based on order. Format as in Figure 3.