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Human auditory steady state evoked potentials during sleep.

R D Linden, K B Campbell, G Hamel

    Ear and Hearing
    |May 1, 1985
    PubMed
    Summary
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    Auditory steady state evoked potentials (ASSEP) show consistent optimal stimulus rates during sleep and wakefulness. While sleep reduces ASSEP amplitude, the intensity-response relationship and detection thresholds remain largely unchanged.

    Area of Science:

    • Neuroscience
    • Auditory Neuroscience
    • Sleep Research

    Background:

    • Auditory steady-state evoked potentials (ASSEP) are crucial for assessing auditory pathway function.
    • Understanding how sleep impacts ASSEP characteristics is vital for clinical and research applications.
    • Previous research has explored ASSEP during sleep, but comprehensive analysis of rate and intensity effects is ongoing.

    Purpose of the Study:

    • To investigate the effects of stimulus rate and intensity on human auditory steady-state evoked potentials during all-night sleep.
    • To compare ASSEP parameters between sleep and wakefulness states.
    • To determine if sleep alters the optimal stimulus rate or intensity-response relationship for ASSEP.

    Main Methods:

    • Recorded auditory steady-state evoked potentials in 10 subjects throughout all-night sleep.

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  • Utilized on-line Fourier analysis to measure response amplitude and phase.
  • Systematically varied stimulus rate (30-50 Hz) and intensity above threshold.
  • Compared ASSEP characteristics during wakefulness versus different sleep stages.

    • Main Results:

    • ASSEP amplitude peaked at stimulus rates of 30 to 50 Hz, a pattern consistent between sleep and wakefulness.
    • Response amplitude was generally lower during sleep compared to wakefulness.
    • ASSEP amplitude increased linearly with stimulus intensity above threshold.
    • The magnitude of amplitude change with increasing intensity was greater during wakefulness than during sleep.
    • Auditory detection thresholds for ASSEP did not significantly differ between sleep and wakefulness.

    Conclusions:

    • The optimal stimulus rate for eliciting maximal ASSEP amplitude is preserved during sleep.
    • Sleep attenuates the overall amplitude of ASSEP but does not fundamentally alter the underlying neural encoding of stimulus intensity or detection thresholds.
    • These findings suggest that ASSEP remain a reliable measure of auditory function across sleep-wake states, with potential for sleep-related auditory monitoring.