title: Neurophysiology of spectrotemporal cue organization of spoken language in auditory memory.
abstract: Listeners assign different weights to spectral dynamics, such as formant rise time (FRT), and temporal dynamics, such as amplitude rise time (ART), during phonetic judgments. We examined the neurophysiological basis of FRT and ART weighting in the /ba/-/wa/ contrast. Electroencephalography was recorded for thirteen adult English speakers during a mismatch negativity (MMN) design using synthetic stimuli: a /ba/ with /ba/-like FRT and ART; a /wa/ with /wa/-like FRT and ART; and a /ba/(wa) with /ba/-like FRT and /wa/-like ART. We hypothesized that because of stronger reliance on FRT, subjects would encode a stronger memory trace and exhibit larger MMN during the FRT than the ART contrast. Results supported this hypothesis. The effect was most robust in the later portion of MMN. Findings suggest that MMN is generated by multiple sources, differentially reflecting acoustic change detection (earlier MMN, bottom-up process) and perceptual weighting of ART and FRT (later MMN, top-down process).
authors.affiliation: The Ohio State University, Wexner Medical Center, Department of Otolaryngology - Head & Neck Surgery, United States. Electronic address: Aaron.Moberly@osumc.edu.
authors.forename: Aaron C
authors.initials: AC
authors.lastname: Moberly
authors.affiliation: The Ohio State University, Wexner Medical Center, Department of Otolaryngology - Head & Neck Surgery, United States.
authors.forename: Jyoti
authors.initials: J
authors.lastname: Bhat
authors.affiliation: The Ohio State University, Wexner Medical Center, Department of Otolaryngology - Head & Neck Surgery, United States.
authors.forename: D Bradley
authors.initials: DB
authors.lastname: Welling
authors.affiliation: The Ohio State University, Wexner Medical Center, Department of Otolaryngology - Head & Neck Surgery, United States.
authors.forename: Antoine J
authors.initials: AJ
authors.lastname: Shahin
mesh_terms: D000328:Adult; D001931:Brain Mapping; D003463:Cues; D004569:Electroencephalography; D005072:Evoked Potentials, Auditory / Q000502:physiology; D005260:Female; D006801:Humans; D007802:Language; D008297:Male; D008568:Memory / Q000502:physiology*; D010700:Phonetics; D013067:Speech Perception / Q000502:physiology*; D055815:Young Adult
keywords: Amplitude rise time; Auditory evoked potentials; Formant rise time; Mismatch negativity; Speech perception