Melanopsin Contributions to the Representation of Images in the Early Visual System

Current Biology : CB
Annette E AllenRobert J Lucas

Abstract

Melanopsin photoreception enhances retinal responses to variations in ambient light (irradiance) and drives non-image-forming visual reflexes such as circadian entrainment [1-6]. Melanopsin signals also reach brain regions responsible for form vision [7-9], but melanopsin's contribution, if any, to encoding visual images remains unclear. We addressed this deficit using principles of receptor silent substitution to present images in which visibility for melanopsin versus rods+cones was independently modulated, and we recorded evoked responses in the mouse dorsal lateral geniculate nucleus (dLGN; thalamic relay for cortical vision). Approximately 20% of dLGN units responded to patterns visible only to melanopsin, revealing that melanopsin signals alone can convey spatial information. Spatial receptive fields (RFs) mapped using melanopsin-isolating stimuli had ON centers with diameters ∼13°. Melanopsin and rod+cone responses differed in the temporal domain, and responses to slow changes in radiance (<0.9 Hz) and stationary images were deficient when stimuli were rendered invisible for melanopsin. We employed these data to devise and test a mathematical model of melanopsin's involvement in form vision and applied it, along with fur...Continue Reading

Citations

Oct 5, 2017·Human Molecular Genetics·Valerio CarelliAlfredo A Sadun
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May 10, 2019·PloS One·Manuel SpitschanAnnette E Allen
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Nov 30, 2018·Proceedings of the National Academy of Sciences of the United States of America·Nina MilosavljevicRobert J Lucas
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Methods Mentioned

BETA
transgenic

Key Resources (RRID) Mentioned

MGI

Software Mentioned

Python
PsychoPy
Prism 7
LabView
MATLAB
MPIDE
Melanopsin Helps Track
Prism
GraphPad
Neuroexplorer

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