Neural Responses and Perceptual Sensitivity to Sound Depend on Sound-Level Statistics.

Scientific Reports
Björn HerrmannIngrid S Johnsrude

Abstract

Sensitivity to sound-level statistics is crucial for optimal perception, but research has focused mostly on neurophysiological recordings, whereas behavioral evidence is sparse. We use electroencephalography (EEG) and behavioral methods to investigate how sound-level statistics affect neural activity and the detection of near-threshold changes in sound amplitude. We presented noise bursts with sound levels drawn from distributions with either a low or a high modal sound level. One participant group listened to the stimulation while EEG was recorded (Experiment I). A second group performed a behavioral amplitude-modulation detection task (Experiment II). Neural activity depended on sound-level statistical context in two different ways. Consistent with an account positing that the sensitivity of neurons to sound intensity adapts to ambient sound level, responses for higher-intensity bursts were larger in low-mode than high-mode contexts, whereas responses for lower-intensity bursts did not differ between contexts. In contrast, a concurrent slow neural response indicated prediction-error processing: The response was larger for bursts at intensities that deviated from the predicted statistical context compared to those not deviatin...Continue Reading

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Citations

Jan 1, 2021·The Journal of the Acoustical Society of America·Juraj Mesik, Magdalena Wojtczak
Jul 22, 2021·Cerebral Cortex·Tamar I RegevIsrael Nelken
Nov 21, 2021·Scientific Reports·Björn HerrmannIngrid S Johnsrude

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