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Related Experiment Videos

Amplitude difference between pattern-evoked potentials after left and right hemifield stimulation in normal subjects.

Y Kuroiwa, G G Celesia, H Tohgi

    Neurology
    |May 1, 1987
    PubMed
    Summary
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    Visual evoked potentials (VEPs) showed greater amplitude with right hemifield stimulation in normal subjects. This finding suggests neuroanatomic asymmetries in the human striate cortex.

    Area of Science:

    • Neuroscience
    • Visual Neuroscience
    • Neurophysiology

    Background:

    • Visual evoked potentials (VEPs) are electrophysiological measures of visual pathway function.
    • Investigating hemispheric differences in visual processing can reveal underlying neuroanatomy.
    • Previous studies suggest potential asymmetries in the human visual cortex.

    Purpose of the Study:

    • To investigate potential differences in visual evoked potential (VEP) amplitudes between right and left visual hemifield stimulation.
    • To explore the relationship between VEP amplitudes and neuroanatomic asymmetries in the human striate cortex.

    Main Methods:

    • Measured VEP amplitudes in 14 healthy, right-handed subjects using pattern hemifield stimulation.
    • Employed a paired t test to compare VEP amplitudes between right and left hemifield stimulation.

    Related Experiment Videos

  • Recorded VEPs from midoccipital and lateral occipital electrodes.

    • Main Results:

    • Transient VEP amplitudes were significantly greater when stimulating the right hemifield compared to the left.
    • This difference was observed at both midoccipital and lateral occipital electrode sites.
    • Distinct scalp distributions were noted between transient and steady-state VEPs, indicating different neuronal populations.

    Conclusions:

    • The findings support the hypothesis of neuroanatomic asymmetries in the human striate cortex.
    • VEP amplitude differences may reflect lateralized functional organization within the visual cortex.
    • Transient and steady-state VEPs likely originate from distinct neuronal networks.