title: Lateral response dynamics and hemispheric dominance for speech perception.
abstract: In this study, we investigated the mechanism for the left cerebral hemisphere's dominance for speech perception. We utilized the crossover of auditory pathways in the central nervous system to present speech stimuli more directly to the left hemisphere (via the right ear) and right hemisphere (via the left ear). Using functional MRI, we found that estimated duration of neural response in the left auditory cortex increased as more speech information was directly received from the right ear. Conversely, response duration in the right auditory cortex was not modulated when more speech information was directly received from the left ear. These data suggest that selective temporal responding distinguishes the dominant from nondominant hemisphere of the human brain during speech perception.
authors.affiliation: Sheffield Cognition and Neuroimaging Laboratory, Academic Clinical Psychiatry, University of Sheffield, UK. m.d.hunter@shef.ac.uk
authors.forename: Michael D
authors.initials: MD
authors.lastname: Hunter
authors.forename: Kwang-Hyuk
authors.initials: KH
authors.lastname: Lee
authors.forename: Panna
authors.initials: P
authors.lastname: Tandon
authors.forename: Randolph W
authors.initials: RW
authors.lastname: Parks
authors.forename: Iain D
authors.initials: ID
authors.lastname: Wilkinson
authors.forename: Peter W R
authors.initials: PW
authors.lastname: Woodruff
mesh_terms: D000161:Acoustic Stimulation; D000328:Adult; D001303:Auditory Cortex / Q000502:physiology*; D001306:Auditory Pathways / Q000502:physiology*; D001931:Brain Mapping; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D011930:Reaction Time / Q000502:physiology; D013067:Speech Perception / Q000502:physiology*