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Article Dans Une Revue Journal of Neuroscience Année : 2013

Alert Response to Motion Onset in the Retina

Eric Chen
  • Fonction : Auteur
Olivier Marre
Clark Fisher
  • Fonction : Auteur
Greg Schwartz
  • Fonction : Auteur
Joshua Levy
  • Fonction : Auteur
Rava Azeredo da Silveira
  • Fonction : Auteur
Michael Berry
  • Fonction : Auteur

Résumé

Previous studies have shown that motion onset is very effective at capturing attention and is more salient than smooth motion. Here, we find that this salience ranking is present already in the firing rate of retinal ganglion cells. By stimulating the retina with a bar that appears, stays still, and then starts moving, we demonstrate that a subset of salamander retinal ganglion cells, fast OFF cells, responds significantly more strongly to motion onset than to smooth motion. We refer to this phenomenon as an alert response to motion onset. We develop a computational model that predicts the time-varying firing rate of ganglion cells responding to the appearance, onset, and smooth motion of a bar. This model, termed the adaptive cascade model, consists of a ganglion cell that receives input from a layer of bipolar cells, represented by individual rectified subunits. Additionally, both the bipolar and ganglion cells have separate contrast gain control mechanisms. This model captured the responses to our different motion stimuli over a wide range of contrasts, speeds, and locations. The alert response to motion onset, together with its computational model, introduces a new mechanism of sophisticated motion processing that occurs early in the visual system.

Dates et versions

hal-03900235 , version 1 (15-12-2022)

Identifiants

Citer

Eric Chen, Olivier Marre, Clark Fisher, Greg Schwartz, Joshua Levy, et al.. Alert Response to Motion Onset in the Retina. Journal of Neuroscience, 2013, 33 (1), pp.120-132. ⟨10.1523/JNEUROSCI.3749-12.2013⟩. ⟨hal-03900235⟩
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