A Cortical Rein on the Tectum’s Gain

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A Cortical Rein on the Tectum’s Gain Sylvia Schröder, Matteo Carandini Neuron Volume 84, Issue 1, Pages 6-8 (October 2014) DOI: 10.1016/j.neuron.2014.09.021 Copyright © 2014 Elsevier Inc. Terms and Conditions

Figure 1 Probing Visual Inputs to the Superior Colliculus (A) The superior colliculus (SC) receives retinotopic visual inputs from retina, primary visual cortex (V1), higher areas of the cortex, and basal ganglia (open arrow denotes inhibition, closed arrows denote excitation). (B) Time course of four visual stimuli: spots growing in size at various speeds (from black to red, fastest to slowest). The vertical axis represents spatial extent, from −20° to 20° of visual angle, relative to the receptive field center. (C) Responses evoked by these stimuli in superficial layers of the SC. (D) Those same responses, when V1 is optogenetically inactivated. (E) Effect of V1 inactivation on the peak SC responses to those four stimuli. (F) Responses of layer 5 neurons in V1 to the same four stimuli. Responses in (B)–(F) are highly simplified depictions of the actual data obtained by Zhao et al. (2014). Neuron 2014 84, 6-8DOI: (10.1016/j.neuron.2014.09.021) Copyright © 2014 Elsevier Inc. Terms and Conditions