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Responses of neurons in the primary visual cortex of a monkey to visual stimuli. (Adapted, with permission, from Hubel and Wiesel 1977.) A. A diagonal bar of light is moved leftward across the visual field, traversing the receptive fields of a binocularly responsive cell in area 17 of visual cortex. Receptive fields measured through the right and left eye are drawn separately. The receptive fields of the two cells are similar in orientation, position, shape, and size, and respond to the same form of stimulus. Recordings (below) show that the cortical neuron responds more effectively to input from the ipsilateral eye. (F, fixation point.) B. The responses single cortical in area 17 can be classified into seven groups. Neurons receiving input only from the contralateral eye (C) fall Source:ofExperience andneurons the Refinement of Synaptic Connections, Principles of Neural Science, Fifth Editon into group 1,Citation: whereasKandel neurons that receive input only from the ipsilateral eye (I) fall into group 7. Other neurons receive inputsFifth fromEditon; both eyes, but the ER, Schwartz JH, Jessell TM, Siegelbaum SA, Hudspeth AJ, Mack S. Principles of Neural Science, 2012 Available input from one eye at: may influence the neuron much more than the other (groups 2 and 6), or the differences may be slight (groups 3 and 5). Some neurons http://mhmedical.com/ Accessed: May 07, 2017 respond equally to input©from eyes (group 4). According to these criteria, the cortical neuron shown in part A falls into group 6. Copyright 2017both McGraw-Hill Education. All rights reserved C. Responsiveness of neurons in area 17 to stimulation of one or the other eye. The upper plot shows the responses of more than 1,000 neurons in area