Vowel categorization induces departure of M100 latency from acoustic prediction

Neuroreport
Timothy P L RobertsN Gage

Abstract

MEG studies have shown that the timing (latency) of the evoked response that peaks approximately 100 ms post-stimulus onset (M100) decreases as frequency increases for sinusoidal tones. We investigated M100 latency using a continuum of synthesized vowel stimuli in which the dominant formant frequency increases from 250 Hz (perceived /u/) to 750 Hz (perceived /a/) in 50 Hz steps. While M100 latency did vary inversely with formant frequency overall, frequency modulation was flattened within each vowel category. However, for mid-continuum ambiguous tokens (i.e. those with increased reaction time/decreased accuracy in the concurrent behavioral identification task), M100 reverted to formant frequency differences, agreeing with previous findings of frequency-dependence. A theory is proposed in which phonological categorization emerges from specific spatial distribution of frequency-tuned neurons.

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Citations

Dec 11, 2003·Neuroscience Letters·Anna Mari MäkeläHannu Tiitinen
Jul 8, 2010·Language and Cognitive Processes·Philip J Monahan, William J Idsardi
Jun 24, 2008·Journal of Clinical and Experimental Neuropsychology·Gwen L SchmidtDonald C Rojas
Apr 7, 2005·Neuroreport·Anna Mari MäkeläHannu Tiitinen
Aug 24, 2007·Journal of Cognitive Neuroscience·Richard E FryeEric Halgren
May 17, 2011·Journal of Cognitive Neuroscience·Mathias ScharingerSamantha Poe
Mar 1, 2013·Wiley Interdisciplinary Reviews. Cognitive Science·Ingo Hertrich, Hermann Ackermann
Sep 21, 2011·Human Brain Mapping·Justin F MonroeJ Christopher Edgar
Aug 19, 2009·Psychophysiology·Patrick J C May, Hannu Tiitinen
Apr 23, 2011·NeuroImage·Mathias ScharingerWilliam J Idsardi
Dec 3, 2016·Autism Research : Official Journal of the International Society for Autism Research·Fahimeh MamashliTal Kenet
Jan 11, 2012·Journal of Speech, Language, and Hearing Research : JSLHR·Mathias ScharingerWilliam J Idsardi

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