Phonological Task Enhances the Frequency-Following Response to Deviant Task-Irrelevant Speech Sounds

Frontiers in Human Neuroscience
Kimmo AlhoCarles Escera

Abstract

In electroencephalography (EEG) measurements, processing of periodic sounds in the ascending auditory pathway generates the frequency-following response (FFR) phase-locked to the fundamental frequency (F0) and its harmonics of a sound. We measured FFRs to the steady-state (vowel) part of syllables /ba/ and /aw/ occurring in binaural rapid streams of speech sounds as frequently repeating standard syllables or as infrequent (p = 0.2) deviant syllables among standard /wa/ syllables. Our aim was to study whether concurrent active phonological processing affects early processing of irrelevant speech sounds reflected by FFRs to these sounds. To this end, during syllable delivery, our healthy adult participants performed tasks involving written letters delivered on a computer screen in a rapid stream. The stream consisted of vowel letters written in red, infrequently occurring consonant letters written in the same color, and infrequently occurring vowel letters written in blue. In the phonological task, the participants were instructed to press a response key to the consonant letters differing phonologically but not in color from the frequently occurring red vowels, whereas in the non-phonological task, they were instructed to respond...Continue Reading

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Citations

Mar 30, 2021·Frontiers in Neural Circuits·Alejandro Tabas, Katharina von Kriegstein

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Software Mentioned

Psychophysics Toolbox
EEGLAB
Neuroscan
MathWorks
Matlab

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