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Brain stem auditory evoked potentials: significant latency differences between ipsilateral and contralateral

D K Prasher, W P Gibson

    Electroencephalography and Clinical Neurophysiology
    |November 1, 1980
    PubMed
    Summary
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    Brain stem auditory evoked potentials (BAEPs) reveal distinct neural pathways for sound. This study establishes normal latency limits, showing significant differences between ipsilateral and contralateral auditory stimulation.

    Area of Science:

    • Neuroscience
    • Auditory Neuroscience
    • Electrophysiology

    Background:

    • Electrical potentials on the scalp follow acoustic stimulation.
    • Brain stem auditory evoked potentials (BAEPs) occur within 10 msec of stimulus onset.
    • Wave latency is a critical and stable measure in BAEP analysis.

    Purpose of the Study:

    • To investigate the effects of ipsilateral and contralateral acoustic stimulation on BAEP latencies.
    • To establish the exact limits of normal latency for each BAEP wave.
    • To determine if different neural pathways are involved in processing ipsilateral versus contralateral auditory stimuli.

    Main Methods:

    • Recording of BAEPs in 23 healthy subjects.
    • Comparison of BAEP latencies under ipsilateral and contralateral acoustic stimulation conditions.

    Related Experiment Videos

  • Statistical analysis to identify significant latency differences.

    • Main Results:

    • Normal latency limits for each BAEP wave were precisely established.
    • Significant differences in wave latencies were observed between ipsilateral and contralateral stimulation.
    • Findings suggest distinct neural pathways are activated by ipsilateral and contralateral stimuli.

    Conclusions:

    • Ipsilateral and contralateral auditory stimuli activate different neural pathways.
    • BAEP recordings can separately investigate responses to ipsilateral and contralateral stimuli in humans.
    • Established normal latency ranges are crucial for accurate interpretation of BAEP findings.