title: Cholinergic modulation of response gain in the rat primary visual cortex.
abstract: Acetylcholine (ACh) is known to modulate neuronal activity in the rodent primary visual cortex (V1). Although cholinergic modulation has been extensively examined in vitro, far less is understood regarding how ACh modulates visual information processing in vivo. We therefore extracellularly recorded visual responses to drifting sinusoidal grating stimuli from V1 of anesthetized rats and tested the effects of ACh administered locally by microiontophoresis. ACh exerted response facilitation or suppression in individual neurons across all cortical layers without any laminar bias. We assessed ACh effects on the stimulus contrast-response function, finding that ACh increased or decreased the response to varying stimulus contrasts in proportion to the magnitude of the control response without changing the shape of the original contrast-response function, which describes response gain control but not contrast gain control. Our results indicate that ACh serves as a gain controller in the visual cortex of rodents.
authors: Graduate School of Frontier Biosciences, Osaka University, 1-17 Machikaneyama, Toyonaka, Osaka, 560-0043, Japan. shimegi@vision.hss.osaka-u.ac.jp
authors: Shogo
authors: S
authors: Soma
authors: Satoshi
authors: S
authors: Shimegi
authors: Naofumi
authors: N
authors: Suematsu
authors: Hiromichi
authors: H
authors: Sato
mesh_terms: D000109:Acetylcholine / Q000494:pharmacology*; D000818:Animals; D018678:Cholinergic Agents / Q000494:pharmacology*; D007478:Iontophoresis; D008297:Male; D018408:Patch-Clamp Techniques; D051381:Rats; D020332:Rats, Inbred LEC; D014793:Visual Cortex / Q000187:drug effects* / Q000473:pathology / Q000502:physiology
chemical_list: D018678:Cholinergic Agents; D000109:Acetylcholine
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