Disentangling the effects of phonation and articulation: Hemispheric asymmetries in the auditory N1m response of the human brain |
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Authors: | Email author" target="_blank">Hannu?TiitinenEmail author Anna?Mari?M?kel? Ville?M?kinen Patrick?JC?May Paavo?Alku |
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Institution: | (1) Apperception & Cortical Dynamics (ACD), Department of Psychology, University of Helsinki, P.O.B. 9, FIN-00014, Finland;(2) BioMag Laboratory,Engineering Centre, Helsinki University Central Hospital, Finland;(3) Laboratory of Acoustics and Audio Signal Processing, Helsinki University of Technology, Espoo, Finland |
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Abstract: | Background The cortical activity underlying the perception of vowel identity has typically been addressed by manipulating the first and
second formant frequency (F1 & F2) of the speech stimuli. These two values, originating from articulation, are already sufficient
for the phonetic characterization of vowel category. In the present study, we investigated how the spectral cues caused by
articulation are reflected in cortical speech processing when combined with phonation, the other major part of speech production
manifested as the fundamental frequency (F0) and its harmonic integer multiples. To study the combined effects of articulation
and phonation we presented vowels with either high (/a/) or low (/u/) formant frequencies which were driven by three different
types of excitation: a natural periodic pulseform reflecting the vibration of the vocal folds, an aperiodic noise excitation,
or a tonal waveform. The auditory N1m response was recorded with whole-head magnetoencephalography (MEG) from ten human subjects
in order to resolve whether brain events reflecting articulation and phonation are specific to the left or right hemisphere
of the human brain. |
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