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The spatial arrangement of excitatory and inhibitory inputs to a cortical neuron determines which features of a stimulus will be encoded by the neuron.A. A neuron in area 3b of the primary somatosensory cortex has overlapping excitatory and inhibitory zones within its receptive field. B. Convergence of three presynaptic neurons with the same arrangement of excitatory and inhibitory zones allows direction and orientation selectivity in a neuron in area 2. 1. Downward motion of a horizontal bar across the receptive field of the postsynaptic cell produces a strong excitatory response because the excitatory fields of all three presynaptic neurons are contacted simultaneously. Upward motion of the bar strongly inhibits firing because it enters all three inhibitory fields Touch, first. The neuron responds poorly to Fifth upward motion through the excitatory field because the initial inhibition outlasts the stimulus. 2. Source: Principles of Neural Science, Editon Motion of a vertical bar across the receptive field evokes a weak response because it simultaneously crosses the excitatory and inhibitory receptive fields Citation: Kandel ER, Schwartz JH, Jessell TM, Siegelbaum SA, Hudspeth AJ, Mack S. Principles of Neural Science, Fifth Editon; 2012 Available of the input neurons. Motion to the left and right are not distinguished in this example. at: http://mhmedical.com/ Accessed: May 12, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved