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Related Experiment Videos

Normal temporal variability of the P100.

B S Oken, K H Chiappa, E Gill

    Electroencephalography and Clinical Neurophysiology
    |March 1, 1987
    PubMed
    Summary
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    Normal P100 latency changes in visual evoked potentials can be up to 11 msec. Changes exceeding this threshold suggest potential visual pathway abnormalities, aiding clinical diagnosis.

    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Clinical Electrophysiology

    Background:

    • Assessing temporal changes in P100 latency is crucial for diagnosing visual pathway disorders.
    • Understanding normal intraindividual variability in P100 latency is essential for accurate clinical interpretation.

    Purpose of the Study:

    • To determine the normal range of intraindividual variability in P100 latency.
    • To establish a threshold for clinically significant P100 latency changes in healthy individuals.

    Main Methods:

    • Serial visual evoked potentials (VEPs) using checkerboard stimuli (3 check sizes) were recorded in 20 healthy volunteers.
    • VEPs were performed at least twice for each subject, with a minimum 6-month interval between tests.
    • P100 latency was measured at Oz, with additional recordings from Pz, O1, and O2 channels.

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    Main Results:

    • The average P100 latency change across all conditions was 2.9 msec, with a maximum absolute change of 11 msec.
    • No significant differences in average latency change were observed across the three check sizes.
    • Mean interocular P100 latency difference change was 2.5 msec (maximum 9 msec); amplitude variability was higher.

    Conclusions:

    • A P100 latency change of up to 11 msec should be considered normal in healthy individuals.
    • P100 latency changes exceeding 11-12 msec are highly indicative of underlying visual pathway abnormalities.