Neural Encoding and Perception of Speech Signals in Informational Masking
- 1 March 2012
- journal article
- research article
- Published by Ovid Technologies (Wolters Kluwer Health) in Ear & Hearing
- Vol. 33 (2), 231-238
- https://doi.org/10.1097/aud.0b013e31823173fd
Abstract
Objective: To investigate the contributions of energetic and informational masking to neural encoding and perception in noise, using oddball discrimination and sentence recognition tasks. Design: P3 auditory evoked potential, behavioral discrimination, and sentence recognition data were recorded in response to speech and tonal signals presented to nine normal-hearing adults. Stimuli were presented at a signal to noise ratio of −3 dB in four background conditions: Quiet, continuous noise, intermittent noise, and four-talker babble. Results: Responses to tonal signals were not significantly different for the three maskers. However, responses to speech signals in the four-talker babble resulted in longer P3 latencies, smaller P3 amplitudes, poorer discrimination accuracy, and longer reaction times than in any of the other conditions. Results also demonstrate significant correlations between physiological and behavioral data. As latency of the P3 increased, reaction times also increased and sentence recognition scores decreased. Conclusion: The data confirm a differential effect of masker type on the P3 and behavioral responses and present evidence of interference by an informational masker to speech understanding at the level of the cortex. Results also validate the use of the P3 as a useful measure to demonstrate physiological correlates of informational masking.Keywords
This publication has 21 references indexed in Scilit:
- Development of a “Virtual Cocktail Party” for the Measurement of Speech Intelligibility in a Sound FieldJournal of the American Academy of Audiology, 2011
- Cortical Encoding of Signals in Noise: Effects of Stimulus Type and Recording ParadigmEar & Hearing, 2011
- Human evoked cortical activity to signal-to-noise ratio and absolute signal levelHearing Research, 2009
- Neural Correlates of Auditory Perceptual Awareness under Informational MaskingPLoS Biology, 2008
- Detection of signals in modulated and unmodulated noise observed using auditory evoked potentialsClinical Neurophysiology, 2006
- Note on informational masking (L)The Journal of the Acoustical Society of America, 2003
- The effects of decreased audibility produced by high-pass noise masking on cortical event-related potentials to speech sounds /ba/ and /da/The Journal of the Acoustical Society of America, 1997
- Masking produced by spectral uncertainty with multicomponent maskersPerception & Psychophysics, 1987
- The N1 Wave of the Human Electric and Magnetic Response to Sound: A Review and an Analysis of the Component StructurePsychophysiology, 1987
- Stimulus frequency and masking as determinants of P300 latency in event-related potentials from auditory stimuliBiological Psychology, 1985