Interocular transfer of adaptation in the primary visual cortex

Howarth, Christopher M., Vorobyov, Vasily and Sengpiel, Frank ORCID: https://orcid.org/0000-0002-7060-1851 2009. Interocular transfer of adaptation in the primary visual cortex. Cerebral Cortex 19 (8) , pp. 1835-1843. 10.1093/cercor/bhn211

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Abstract

Prolonged viewing of an unchanging pattern causes adaptation, which can be demonstrated by visual aftereffects such as the tilt and waterfall illusions. In normal observers, these typically exhibit interocular transfer (IOT), being observed when the adapting and test stimuli are shown to different eyes. Convergence of inputs from both eyes upon binocular neurons only occurs in the primary visual cortex (V1), and adaptation is substantially a cortical phenomenon. However, little is known about a physiological substrate of IOT in V1 and how it relates to the binocularity of neurons and local ocular dominance (OD) column architecture. We employed optical imaging to obtain OD maps in cat V1 and recorded from single neurons at targeted penetration sites to quantify their adaptation by drifting gratings when adapter and test stimulus were presented either to the same or to the opposite eyes. In contrast to earlier reports, clear IOT of adaptation was observed for binocular as well as monocular neurons; at population level, its strength amounted to 55%. Moreover, the position of the cells with respect to OD column borders had no significant effect on the strength of IOT. IOT does not appear to strongly depend on conventional binocularity of neurons.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Biosciences Neuroscience and Mental Health Research Institute (NMHRI)
Subjects:	R Medicine > RE Ophthalmology
Uncontrolled Keywords:	aftereffect; binocular; monocular; optical imaging; orientation V1
Publisher:	Oxford Journals
ISSN:	1047-3211
Last Modified:	17 Oct 2022 10:41
URI:	https://orca.cardiff.ac.uk/id/eprint/8938

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