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Non-image-forming photoreceptors improve visual orientation selectivity and image perception
Yiming Shi1, Jiaming Zhang1, Xingyi Li2
1Hefei National Research Center for Physical Sciences at the Microscale, CAS Key Laboratory of Brain Function and Disease, Biomedical Sciences and Health Laboratory of Anhui Province, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China.
Neuron
|December 18, 2024
Summary
Intrinsically photosensitive retinal ganglion cells (ipRGCs), once thought only for non-image vision, surprisingly enhance visual orientation perception in mice and humans by refining visual cortex responses. This discovery reveals a new visual pathway for feature detection.
Area of Science:
- Neuroscience
- Visual System Research
- Retinal Cell Biology
Background:
- Traditionally, rods and cones were considered the sole mediators of image perception.
- Intrinsically photosensitive retinal ganglion cells (ipRGCs) were primarily associated with non-image-forming visual functions like circadian rhythms and pupillary reflexes.
Purpose of the Study:
- To investigate the role of ipRGCs in visual feature perception beyond their known non-image-forming functions.
- To determine if ipRGC activation influences orientation selectivity in the primary visual cortex (V1).
Main Methods:
- Electrophysiological recordings from mouse V1 neurons.
- Behavioral experiments assessing orientation discrimination in mice.
- Psychophysical experiments in human participants involving visual spectrum manipulation to activate ipRGCs.
Main Results:
- ipRGC activation enhanced orientation selectivity in mouse V1 by increasing preferred-orientation responses and narrowing tuning bandwidth.
- Differential modulation of excitatory and inhibitory V1 neurons by ipRGCs reshaped the excitatory/inhibitory balance.
- Light activation of ipRGCs improved behavioral orientation discrimination in mice and humans.
Conclusions:
- ipRGCs contribute to image-forming visual perception, specifically enhancing orientation selectivity.
- A novel visual pathway involving ipRGCs facilitates the perception of visual orientation features.
- This finding challenges the long-held dogma about the exclusive roles of different retinal photoreceptor types.
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