Figure 4 (A) Four space-time separable receptive fields are shown as x-t plots. These receptive fields were constructed by combining sine and cosine phase spatial receptive fields with the two temporal impulse response functions shown in Fig. 2B. All four receptive fields are not oriented in space-time and therefore are not direction selective. (B) Four direction selective receptive fields. The top two are selective for rightward motion (motion in the positive x direction), whereas the bottom two are selective for leftward motion (motion in the negative x direction). These receptive fields were constructed by taking the sum or difference of pairs of space-time separable receptive fields shown in A.

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