title: Shifted encoding strategy in retinal luminance adaptation: from firing rate to neural correlation.
abstract: Neuronal responses to prolonged stimulation attenuate over time. Here, we ask a fundamental question: is adaptation a simple process for the neural system during which sustained input is ignored, or is it actually part of a strategy for the neural system to adjust its encoding properties dynamically? After simultaneously recording the activities of a group of bullfrog's retinal ganglion cells (dimming detectors) in response to sustained dimming stimulation, we applied a combination of information analysis approaches to explore the time-dependent nature of information encoding during the adaptation. We found that at the early stage of the adaptation, the stimulus information was mainly encoded in firing rates, whereas at the late stage of the adaptation, it was more encoded in neural correlations. Such a transition in encoding properties is not a simple consequence of the attenuation of neuronal firing rates, but rather involves an active change in the neural correlation strengths, suggesting that it is a strategy adopted by the neural system for functional purposes. Our results reveal that in encoding a prolonged stimulation, the neural system may utilize concerted, but less active, firings of neurons to encode information.
authors.affiliation: School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China;
authors.forename: Lei
authors.initials: L
authors.lastname: Xiao
authors.forename: Mingsha
authors.initials: M
authors.lastname: Zhang
authors.forename: Dajun
authors.initials: D
authors.lastname: Xing
authors.forename: Pei-Ji
authors.initials: PJ
authors.lastname: Liang
authors.forename: Si
authors.initials: S
authors.lastname: Wu
mesh_terms: D000200:Action Potentials; D000222:Adaptation, Physiological; D000818:Animals; D008959:Models, Neurological; D010775:Photic Stimulation; D011892:Rana catesbeiana; D012165:Retinal Ganglion Cells / Q000502:physiology*
keywords: discrimination; information coding; luminance adaptation; neural correlation; retinal ganglion cell