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Related Experiment Videos

Collicular function in human vision.

J Zihl, D von Cramon

    Experimental Brain Research
    |May 2, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Repetitive visual stimulation causes threshold elevation, which is normally abolished by contralateral stimulation. This study suggests this phenomenon is linked to collicular adaptation and interhemispheric interaction.

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    Area of Science:

    • Neuroscience
    • Visual Perception
    • Ophthalmology

    Background:

    • Repetitive visual stimulation can lead to threshold elevation in the visual field periphery.
    • This effect is typically abolished by stimulating a mirror-symmetric position in the opposite visual field.
    • The underlying neural mechanisms are not fully understood.

    Purpose of the Study:

    • To investigate the role of the superior colliculus in visual threshold elevation.
    • To explore the collicular contribution to interhemispheric visual interaction.
    • To determine if collicular adaptation underlies visual field changes.

    Main Methods:

    • Case study of a patient with a congenital malformation of the right superior colliculus.
    • Visual field testing involving repetitive stimulation.

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  • Comparison of stimulation effects in different visual half-fields and at mirror-symmetric positions.

    • Main Results:

    • The patient did not exhibit threshold elevation when stimulated in the left visual field.
    • Stimulation in the right visual half-field caused typical threshold elevation.
    • Contralateral stimulation failed to abolish threshold elevation in the right half-field for this patient.

    Conclusions:

    • Threshold elevation likely results from adaptation within the superior colliculus.
    • Interhemispheric visual interaction, organized in a mirror-symmetric manner, appears to be mediated at the collicular level.