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

Figure 9

Direction selectivity in the two-unit model. (a) Architecture of the microcircuit. There are 2 units in total. (a) Outgoing connections from unit 1 and unit 2 exhibit STF. Connections are bidirectional, with self-connections allowed. (b) Average response of two units to a hypothetical stimulus moving in bidirectional motion. Unit 1 and unit 2 exhibit the same preference in response to opposite directions of motion. Besides keeping all other parameters the same, the default multiplicative factor A (Table 1) was multiplied by 2, in order to ensure that the mean activity of units falls within a similar range as that of the six-unit microcircuit (Figures 7(a) and 7(b)).

(a)

(b)