Figure 6.

Changes in pooling weights with training on a fine discrimination task. a, Pseudocolor plots of the pooling weights binned by the neurons’ threshold sensitivity to the motion stimulus (6%-80% coh in logarithmic increments of 1.06) and direction tuning (-170-180° in linear increments of 10°) for different training epochs. Color scale of weight magnitude is shown at the right. Gray horizontal bands correspond to neuronal sensitivities not found in the MT data set used to model the sensory responses ⁴. b, Optimal pooling weights for maximizing the percentage of correct responses (see Methods). c, Pooling weights (points) as a function of direction tuning for two different threshold sensitivities (top: 8.7% coherence; bottom: 16.5%; arrows on the right of panel a) at different training epochs. Red lines indicate the weight profiles for optimal linear pooling from b. Error bars are s.e.m. over ten simulations. Blue and red triangles at the bottom of each panel indicate the directions of motion to discriminate.