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      • Faculty of Economics, Administrative And Social Sciences
      • Department of Psychology
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      Dynamic dot displays reveal material motion network in the human brain

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      Author(s)
      Schmid, A. C.
      Boyacı, Hüseyin
      Doerschner,Katja
      Date
      2021-03
      Source Title
      NeuroImage
      Print ISSN
      1053-8119
      Electronic ISSN
      1095-9572
      Publisher
      Elsevier BV
      Volume
      228
      Pages
      1 - 10
      Language
      English
      Type
      Article
      Item Usage Stats
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      68
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      Abstract
      There is growing research interest in the neural mechanisms underlying the recognition of material categories and properties. This research field, however, is relatively more recent and limited compared to investigations of the neural mechanisms underlying object and scene category recognition. Motion is particularly important for the perception of non-rigid materials, but the neural basis of non-rigid material motion remains unexplored. Using fMRI, we investigated which brain regions respond preferentially to material motion versus other types of motion. We introduce a new database of stimuli – dynamic dot materials – that are animations of moving dots that induce vivid percepts of various materials in motion, e.g. flapping cloth, liquid waves, wobbling jelly. Control stimuli were scrambled versions of these same animations and rigid three-dimensional rotating dots. Results showed that isolating material motion properties with dynamic dots (in contrast with other kinds of motion) activates a network of cortical regions in both ventral and dorsal visual pathways, including areas normally associated with the processing of surface properties and shape, and extending to somatosensory and premotor cortices. We suggest that such a widespread preference for material motion is due to strong associations between stimulus properties. For example viewing dots moving in a specific pattern not only elicits percepts of material motion; one perceives a flexible, non-rigid shape, identifies the object as a cloth flapping in the wind, infers the object's weight under gravity, and anticipates how it would feel to reach out and touch the material. These results are a first important step in mapping out the cortical architecture and dynamics in material-related motion processing.
      Keywords
      Material perception
      Motion
      fMRI
      Point-light motion
      Dynamic dot
      Structure from motion
      Permalink
      http://hdl.handle.net/11693/77667
      Published Version (Please cite this version)
      https://doi.org/10.1016/j.neuroimage.2020.117688
      Collections
      • Department of Psychology 216
      • National Magnetic Resonance Research Center (UMRAM) 250
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