Figure 3.
Structure of feedback inhibition models. (A) “Leaky, competing accumulator (LCA) model”: the integrators are intrinsically leaky, lateral inhibition is provided by individual feedback projections from the output of each integrator to the inputs of the other two integrators. (B) Alternative implementation of a balanced LCA model. The integrators’ intrinsic leak (determining τint) is substantially smaller than the effective leak (determining τeff) caused by the circuitry. The balance between leakiness and lateral inhibition is achieved by generating one common inhibitory feedback signal.