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Tonic retinal influences in primates

R W Doty

    Annals of the New York Academy of Sciences
    |January 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Squirrel monkeys and macaques exhibit unique luxotonic neurons in the striate cortex, which are sensitive to light levels but disappear with anesthesia. This neuronal activity is crucial for primate visual processing.

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    Area of Science:

    • Neuroscience
    • Visual Neuroscience
    • Primate Neurophysiology

    Background:

    • The striate cortex in primates exhibits unique neuronal activity patterns.
    • Luxotonic units, characterized by sustained firing reflecting light levels, are found in unanesthetized primates.
    • Anesthesia abolishes luxotonic activity, and retinal input elimination causes profound EEG alterations in primate striate cortex.

    Purpose of the Study:

    • To investigate the nature and significance of luxotonic neuronal activity in the primate striate cortex.
    • To explore the relationship between luxotonic activity, anesthesia, and EEG changes following retinal input elimination.

    Main Methods:

    • Electrophysiological recordings in unanesthetized squirrel monkeys and macaques.
    • Observation of neuronal discharge patterns under varying light conditions.

    Related Experiment Videos

  • Analysis of electroencephalogram (EEG) changes following retinal deafferentation and during sleep.

    • Main Results:

    • Identified luxotonic units with sustained firing reflecting diffuse illumination, distinct from photergic and scotergic units.
    • Demonstrated that luxotonic activity is abolished by anesthesia.
    • Observed significant EEG alterations in primate striate cortex after retinal input elimination, which normalize during sleep.

    Conclusions:

    • Luxotonic activity is a unique feature of the primate striate cortex, sensitive to light and anesthesia.
    • The profound EEG changes in primates after retinal deafferentation may be linked to the loss of luxotonic activity.
    • Non-visual systems appear to influence striate cortex activity in sleeping blind primates.