Stimulating both eyes with matching stimuli enhances V1 responses

iScience

Kacie Dougherty¹  Loïc Daumail²  Michele A. Cox²  Brock M. Carlson²  Alexander Maier²  Blake A. Mitchell²  Jacob A. Westerberg³ 

[1] Corresponding author;Department of Psychology, Vanderbilt Brain Institute, Vanderbilt Vision Research Center, Vanderbilt University, Nashville, TN 37240, USA;Princeton Neuroscience Institute, Princeton University, Princeton, NJ 08544, USA;

关键词: Biological sciences;    Neuroscience;    Behavioral neuroscience;   

DOI  :  

来源: DOAJ

【 摘 要 】

Summary: Neurons in the primary visual cortex (V1) of primates play a key role in combining monocular inputs to form a binocular response. Although much has been gleaned from studying how V1 responds to discrepant (dichoptic) images, equally important is to understand how V1 responds to concordant (dioptic) images in the two eyes. Here, we investigated the extent to which concordant, balanced, zero-disparity binocular stimulation modifies V1 responses to varying stimulus contrast using intracranial multielectrode arrays. On average, binocular stimuli evoked stronger V1 activity than their monocular counterparts. This binocular facilitation scaled most proportionately with contrast during the initial transient. As V1 responses evolved, additional contrast-mediated dynamics emerged. Specifically, responses exhibited longer maintenance of facilitation for lower contrast and binocular suppression at high contrast. These results suggest that V1 processes concordant stimulation of both eyes in at least two sequential steps: initial response enhancement followed by contrast-dependent control of excitation.

【 授权许可】

Unknown