Acoustic experience but not attention modifies neural population phase expressed in human primary auditory cortex

Hearing Research
P E GanderLarry E Roberts

Abstract

We studied the effect of auditory training on the 40-Hz auditory steady-state response (ASSR) known to localize tonotopically to the region of primary auditory cortex (A1). The stimulus procedure was designed to minimize competitive interactions among frequency representations in A1 and delivered target events at random times in a training window, to increase the likelihood that neuroplastic changes could be detected. Experiment 1 found that repeated exposure to this stimulus advanced the phase of the ASSR (shortened the time delay between the 40-Hz response and stimulus waveforms). The phase advance appeared at the outset of the second of two sessions separated by 24-72 h, did not require active training, and was not accompanied by changes in ASSR amplitude over this time interval. Experiment 2 applied training for 10 sessions to reveal further advances in ASSR phase and also an increase in ASSR amplitude, but the amplitude effect lagged that on phase and did not correlate with perceptual performance while the phase advance did. A control group trained for a single session showed a phase advance but no amplitude enhancement when tested 6 weeks later (retention). In both experiments attention to auditory signals increased ASSR ...Continue Reading

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Citations

Mar 30, 2011·Brain Topography·Laurel J TrainorDaniel J Bosnyak
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Apr 28, 2017·Journal of Neurophysiology·André Luiz Vieira LockmannMarcio Flávio Dutra Moraes

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