Top-Down Inputs Enhance Orientation Selectivity in Neurons of the Primary Visual Cortex during Perceptual Learning
Figure 3
A. With learning, feedforward connections from a population of V1 neurons to a population V2 neurons strengthened. B. The excitatory V2 neurons projected to both the excitatory and inhibitory neurons in V1. C. Top. Membrane potential of a V1 neuron before training. Bottom. Excitatory and inhibitory input currents to the V1 neuron before training. D. Top. Membrane potential of the V1 neuron after training. Bottom. Excitatory and inhibitory currents to the V1 neuron after training. E. Response function (f-I curve) of a V1 neuron. The neuron did not respond to the trained stimulus, and the response function was tested by injecting current to the neuron.