title: On the planum temporale lateralization in suprasegmental speech perception: evidence from a study investigating behavior, structure, and function.
abstract: This study combines functional and structural magnetic resonance imaging to test the "asymmetric sampling in time" (AST) hypothesis, which makes assertions about the symmetrical and asymmetrical representation of speech in the primary and nonprimary auditory cortex. Twenty-three volunteers participated in this parametric clustered-sparse fMRI study. The availability of slowly changing acoustic cues in spoken sentences was systematically reduced over continuous segments with varying lengths (100, 150, 200, 250 ms) by utilizing local time-reversion. As predicted by the hypothesis, functional lateralization in Heschl's gyrus could not be observed. Lateralization in the planum temporale and posterior superior temporal gyrus shifted towards the right hemisphere with decreasing suprasegmental temporal integrity. Cortical thickness of the planum temporale was automatically measured. Participants with an L > R cortical thickness performed better on the in-scanner auditory pattern-matching task. Taken together, these findings support the AST hypothesis and provide substantial novel insight into the division of labor between left and right nonprimary auditory cortex functions during comprehension of spoken utterances. In addition, the present data yield support for a structural-behavioral relationship in the nonprimary auditory cortex.
authors: Division Neuropsychology, Institute of Psychology, University of Zurich, Switzerland; Research Unit for Neuroplasticity and Learning in the Healthy Aging Brain (HAB LAB), Institute of Psychology, University of Zurich, Switzerland.
authors: Franziskus
authors: F
authors: Liem
authors: Martina A
authors: MA
authors: Hurschler
authors: Lutz
authors: L
authors: Jäncke
authors: Martin
authors: M
authors: Meyer
mesh_terms: D000161:Acoustic Stimulation; D001303:Auditory Cortex / Q000033:anatomy & histology / Q000502:physiology*; D001921:Brain / Q000033:anatomy & histology / Q000502:physiology*; D001931:Brain Mapping; D005260:Female; D007839:Functional Laterality; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D009483:Neuropsychological Tests; D009929:Organ Size; D013060:Speech; D013067:Speech Perception / Q000502:physiology*; D013647:Task Performance and Analysis
keywords: anatomical asymmetry; asymmetric sampling in time; auditory cortex; functional lateralization; speech perception
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