4.7 Article

Left extrastriate body area is sensitive to the meaning of symbolic gesture: evidence from fMRI repetition suppression

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SCIENTIFIC REPORTS
卷 6, 期 -, 页码 -

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NATURE PUBLISHING GROUP
DOI: 10.1038/srep31064

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  1. Telemedicine and Advanced Technology Research Center (TATRC)-subsidized Pilot-study Funds by Lewis Center for NeuroImaging at the University of Oregon
  2. Brain, Biology and Machine Initiative (BBMI) Research Fellowship in the Department of Psychology at the University of Oregon
  3. Polish National Science Center (Narodowe Centrum Nauki, NCN) grant [Maestro 2011/02/A/HS6/00174]
  4. Ministry of Science and Higher Education (Ministerstwo Nauki i Szkolnictwa Wyzszego, MNiSW) grant [6168/IA/128/2012]
  5. NCN grant [Maestro 2011/02/A/HS6/00174]
  6. Maestro grant

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Functional magnetic resonance imaging (fMRI) adaptation (a.k.a. repetition suppression) paradigm was used to test if semantic information contained in object-related (transitive) pantomimes and communicative (intransitive) gestures is represented differently in the occipito-temporal cortex. Participants watched 2.75 s back-to-back videos where the meaning of gesture was either repeated or changed. The just observed (typically second) gesture was then imitated. To maintain participants' attention, some trials contained a single video. fMRI adaptation -signal decreases-for watching both movement categories were observed particularly in the lateral occipital cortex, including the extrastriate body area (EBA). Yet, intransitive (vs. transitive) gesture specific repetition suppression was found mainly in the left rostral EBA and caudal middle temporal gyrus-the rEBA/cMTG complex. Repetition enhancement (signal increase) was revealed in the precuneus. While the whole brain and region-of-interest analyses indicate that the precuneus is involved only in visuospatial action processing for later imitation, the common EBA repetition suppression discloses sensitivity to the meaning of symbolic gesture, namely the semantic what of actions. Moreover, the rEBA/cMTG suppression reveals greater selectivity for conventionalized communicative gesture. Thus, fMRI adaptation shows higher-order functions of EBA, its role in the semantic network, and indicates that its functional repertoire is wider than previously thought.

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