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Injections of AAV Vectors for Optogenetics in Anesthetized and Awake Behaving Non-Human Primate Brain

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Contrast and Luminance Gain Control in the Macaque's Lateral Geniculate Nucleus.

R T Raghavan¹, Jenna G Kelly¹, J Michael Hasse¹

¹Center for Neural Science, New York University, New York, New York 10003.

|March 1, 2023

Summary

Visual adaptation mechanisms in the brain

Keywords:

LGN contrast gain control luminance temporal frequency

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Area of Science:

Neuroscience
Visual processing
Sensory adaptation

Background:

Natural visual scenes exhibit significant variations in light levels (luminance and contrast).
Retinal ganglion cells employ adaptive mechanisms to maintain sensitivity to these variations.
The precise nature and downstream interactions of these adaptation mechanisms remain unclear.

Purpose of the Study:

To investigate how magnocellular and parvocellular neurons in the lateral geniculate nucleus (LGN) adapt to changes in luminance and contrast.
To elucidate the distinct roles of magnocellular and parvocellular pathways in visual adaptation.
To determine if luminance and contrast adaptation mechanisms are independent and originate in the retina.

Main Methods:

Electrophysiological recordings from LGN neurons in anesthetized adult male macaques.
Characterization of neuronal responses to controlled changes in stimulus contrast and luminance.
Analysis of adaptation effects on temporal frequency sensitivity in different LGN layers.

Main Results:

Magnocellular neurons selectively attenuated sensitivity to low-temporal frequencies as contrast increased, while preserving high-temporal frequency sensitivity.
Parvocellular neurons showed no significant adaptation to contrast.
Both magnocellular and parvocellular cells increased sensitivity to high-temporal frequencies with increasing luminance.
Luminance adaptation was independent of contrast adaptation in LGN neurons.

Conclusions:

Luminance and contrast adaptation in the LGN appear to be mediated by two independent mechanisms.
These adaptation mechanisms are likely retinal in origin, consistent with findings in retinal ganglion cells.
The findings suggest a sophisticated, layer-specific processing of visual information within the LGN to handle natural scene variations.