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N1 Repetition-Attenuation for Acoustically Variable Speech and Spectrally Rotated Speech
Ellen Marklund1, Lisa Gustavsson1, Petter Kallioinen1
1Phonetics Laboratory, Department of Linguistics, Stockholm University, Stockholm, Sweden.
Frontiers in Human Neuroscience
|November 16, 2020
Summary
The N1 wave
Area of Science:
- Auditory Neuroscience
- Speech Perception
- Cognitive Neuroscience
Background:
- Event-related N1 wave amplitude diminishes with stimulus repetition.
- Repetition-attenuation in auditory processing is not well understood for variable stimuli.
- The influence of acoustic versus perceptual category repetition on N1 attenuation is unclear.
Purpose of the Study:
- To investigate N1 repetition-attenuation using variable speech and spectrally rotated speech.
- To assess the impact of acoustic and perceptual category variation on N1 attenuation.
- To compare N1 attenuation between speech and non-speech auditory stimuli.
Main Methods:
- Participants (n=19) listened to vowel exemplars with varying acoustic and perceptual variability.
- Stimuli included identical exemplars, different exemplars of the same vowel, and different exemplars of different vowels.
- Spectrally rotated speech stimuli were used to create non-speech control conditions.
Main Results:
- N1 repetition-attenuation occurred despite acoustic and perceptual category variability.
- The degree of variability did not influence the extent of N1 attenuation.
- Speech stimuli showed less N1 attenuation compared to acoustically matched non-speech stimuli.
Conclusions:
- N1 repetition-attenuation is robust to variations in acoustic and perceptual categories.
- Speech stimuli elicit reduced N1 attenuation compared to non-speech stimuli.
- The precise reason for reduced attenuation with speech (perceptual categorization or other factors) requires further investigation.
Keywords:
N1acoustic variabilityhabituationneural refractorinessrepetition-attenuationrepetition-suppressionspectrally rotated speechspeech processingMore Related Videos
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