Feb 9, 2016

Light adaptation explains different linearity of ON and OFF responses

BioRxiv : the Preprint Server for Biology
Matteo Carandini

Abstract

The visual system separates the responses to dark and light stimuli into OFF and ON channels. Recordings in visual thalamus indicate that these channels exhibit marked asymmetries in linearity: OFF responses grow roughly linearly with intensity decrements, but ON responses can saturate with small intensity increments. Here I show that this asymmetry is likely to originate in photoreceptors, as it follows from the classical description of their light responses and of their properties of light adaptation. Under this interpretation, the surprising aspect of the recordings is that the visual system does so little to change this asymmetry in subsequent stages.

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Mentioned in this Paper

Photoreceptors
Visual System
Light Adaptation
Ion Channel
Adaptation
Description
Cholest OFF
Entire Visual System
Entire Thalamus
Photoreceptors, Plant

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