Effect of feedbacks on population response in V1.

<p><b>A.</b> Population response in V1 to a stimulus before training, with (black) and without (grey) recurrent connections among V1 neurons. <b>B.</b> Input-output function in V1 neurons, with (black) and without (grey) recurrent connections among V1 neurons. <b>C.</b> Population response in V1 to the trained stimulus (preferred stimulus for neuron <b><i>A</i></b>) before and after training. <b>D.</b> Responses of neurons <b><i>A</i></b> and <b><i>B</i></b> to the trained stimulus (preferred for neuron <b><i>A</i></b>) changed due to feedback. Black line indicates input-output relation in V1. Blue arrows indicate the strength of feedback inputs. Black and grey filled circles represent neural response of neurons <b><i>A</i></b> and <b><i>B</i></b> to the trained stimulus before and after training. <b>E.</b> Population response in V1 to a novel stimulus (preferred for neuron <b><i>B</i></b>), before and after training with the stimulus preferred for neuron <b><i>A</i></b>. <b>F.</b> Responses of neurons <b><i>A</i></b> and <b><i>B</i></b> to the novel stimulus (preferred for neuron <b><i>B</i></b>) changed due to feedback. Black line indicates input-output relation in V1. Blue arrows indicate feedback inputs. Black and grey filled circles represent neural responses to stimulus preferred for neuron <b><i>B</i></b> before and after training.