Document Detail

Functional ear (a)symmetry in brainstem neural activity relevant to encoding of voice pitch: a precursor for hemispheric specialization?
MedLine Citation:
PMID:  21658753     Owner:  NLM     Status:  MEDLINE    
Pitch processing is lateralized to the right hemisphere; linguistic pitch is further mediated by left cortical areas. This experiment investigates whether ear asymmetries vary in brainstem representation of pitch depending on linguistic status. Brainstem frequency-following responses (FFRs) were elicited by monaural stimulation of the left and right ear of 15 native speakers of Mandarin Chinese using two synthetic speech stimuli that differ in linguistic status of tone. One represented a native lexical tone (Tone 2: T2); the other, T2', a nonnative variant in which the pitch contour was a mirror image of T2 with the same starting and ending frequencies. Two 40-ms portions of f(0) contours were selected in order to compare two regions (R1, early; R2 late) differing in pitch acceleration rate and perceptual saliency. In R2, linguistic status effects revealed that T2 exhibited a larger degree of FFR rightward ear asymmetry as reflected in f(0) amplitude relative to T2'. Relative to midline (ear asymmetry=0), the only ear asymmetry reaching significance was that favoring left ear stimulation elicited by T2'. By left- and right-ear stimulation separately, FFRs elicited by T2 were larger than T2' in the right ear only. Within T2', FFRs elicited by the earlier region were larger than the later in both ears. Within T2, no significant differences in FFRS were observed between regions in either ear. Collectively, these findings support the idea that origins of cortical processing preferences for perceptually-salient portions of pitch are rooted in early, preattentive stages of processing in the brainstem.
Ananthanarayan Krishnan; Jackson T Gandour; Saradha Ananthakrishnan; Gavin M Bidelman; Christopher J Smalt
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2011-06-11
Journal Detail:
Title:  Brain and language     Volume:  119     ISSN:  1090-2155     ISO Abbreviation:  Brain Lang     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2011-10-17     Completed Date:  2012-01-31     Revised Date:  2013-06-28    
Medline Journal Info:
Nlm Unique ID:  7506220     Medline TA:  Brain Lang     Country:  United States    
Other Details:
Languages:  eng     Pagination:  226-31     Citation Subset:  IM    
Copyright Information:
2011 Elsevier Inc. All rights reserved.
Department of Speech Language Hearing Sciences, Purdue University, West Lafayette, IN, USA 47907-2038, USA.
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MeSH Terms
Brain Stem / physiology*
Dominance, Cerebral / physiology*
Ear / physiology
Evoked Potentials, Auditory, Brain Stem / physiology*
Pitch Perception / physiology*
Signal Processing, Computer-Assisted
Grant Support

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