Ultra-fast speech comprehension in blind subjects engages primary visual cortex, fusiform gyrus, and pulvinar - a functional magnetic resonance imaging (fMRI) study.
Background: Individuals suffering from vision loss of a peripheral origin may learn to understand spoken language at a rate of up to about 22 syllables (syl) per second - exceeding by far the maximum performance level of normal-sighted listeners (ca. 8 syl/s). To further elucidate the brain mechanis...
| Publicado en: | BMC Neuroscience Vol. 14; no. 1; pp. 74 - 75 |
|---|---|
| Autores principales: | , , |
| Formato: | research Journal Article |
| Publicado: |
BioMed Central
2013
|
| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=104115129&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 104115129 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 14712202 1CI8 jtl: BMC Neuroscience issn: 14712202 maglogo: N pubinfo: dt: 2013 vid: 14 iid: 1 pid: 24147 pub: BioMed Central artinfo: ui: 104115129 104115129 NLM23879896 2012373361 10.1186/1471-2202-14-74 NLM23879896 PMC3847124 104115129 ppf: 74 ppct: 1 formats: tig: atl: Ultra-fast speech comprehension in blind subjects engages primary visual cortex, fusiform gyrus, and pulvinar - a functional magnetic resonance imaging (fMRI) study. aug: au: Dietrich, Susanne Hertrich, Ingo Ackermann, Hermann affil: Center for Neurology/Department of General Neurology, Hertie Institute for Clinical Brain Research, University of Tübingen, Hoppe-Seyler-Str, 3, D-72076, Tübingen, Germany. susanne.dietrich@med.uni-tuebingen.de. sug: subj: Blindness Brain Mapping Cerebral Cortex Physiology Readability Speech Perception Adult Female Image Interpretation, Computer Assisted Magnetic Resonance Imaging Male Thalamus Physiology Time Factors Occipital Lobe Physiology Persons with Disabilities Adult: 19-44 years Female Male ab: Background: Individuals suffering from vision loss of a peripheral origin may learn to understand spoken language at a rate of up to about 22 syllables (syl) per second - exceeding by far the maximum performance level of normal-sighted listeners (ca. 8 syl/s). To further elucidate the brain mechanisms underlying this extraordinary skill, functional magnetic resonance imaging (fMRI) was performed in blind subjects of varying ultra-fast speech comprehension capabilities and sighted individuals while listening to sentence utterances of a moderately fast (8 syl/s) or ultra-fast (16 syl/s) syllabic rate.Results: Besides left inferior frontal gyrus (IFG), bilateral posterior superior temporal sulcus (pSTS) and left supplementary motor area (SMA), blind people highly proficient in ultra-fast speech perception showed significant hemodynamic activation of right-hemispheric primary visual cortex (V1), contralateral fusiform gyrus (FG), and bilateral pulvinar (Pv).Conclusions: Presumably, FG supports the left-hemispheric perisylvian "language network", i.e., IFG and superior temporal lobe, during the (segmental) sequencing of verbal utterances whereas the collaboration of bilateral pulvinar, right auditory cortex, and ipsilateral V1 implements a signal-driven timing mechanism related to syllabic (suprasegmental) modulation of the speech signal. These data structures, conveyed via left SMA to the perisylvian "language zones", might facilitate - under time-critical conditions - the consolidation of linguistic information at the level of verbal working memory. pubtype: Academic Journal doctype: research Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
|---|