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Key points
M1 intrinsically photosensitive retinal ganglion cells (ipRGCs) are known to encode absolute light intensity (irradiance) for non‐image‐forming visual functions (subconscious vision), such as circadian photoentrainment and the pupillary light reflex.
It remains unclear how M1 cells respond to relative light intensity (contrast) and patterned visual signals.
The present study identified...