Discrimination of Motion Direction in a Robot Using a Phenomenological Model of Synaptic Plasticity

Figure 10

Spike count correlations predict shared and unshared motion direction preferences. (a) Mean SCC between pairs of V1 cells within and between subpopulations. (b) Average firing rate of six neurons in V1 responding to drifting vertical sinusoidal gratings. Neurons 30, 103, and 63 exhibit a preferential response for stimuli moving towards the right, whereas neurons 98, 42, and 5 exhibit a preference for stimuli moving towards the left. (c) Mean SCC between pairs of units within and between subpopulations in the six-unit microcircuit. (d) Average firing rate of six units responding to a vertical orientation stimulus in motion. Units 1, 2, and 3 exhibit a preferential response for stimuli moving towards the right, whereas units 4, 5, and 6 exhibit a preference for stimuli moving towards the left. (e) Mean SCC between the pair of units within the two-unit microcircuit. Given that both units display fully synchronized spatiotemporal patterns of activity for left and right motion discrimination (see S2 in Supplementary Material for video illustration), their mean SCC is 1. Notice that the two-unit model behaves as a single subpopulation; therefore, mean SCC for “Between” and “Within 2” cannot be computed.