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開催日 2014/9/13
時間 14:00 - 15:00
会場 Poster / Exhibition(Event Hall B)

Task-dependent changes of mirror-image sensitivity in visual processing streams

  • P3-270
  • Thuy Dinh:1 Kimihiro Nakamura:1 Tania Fernandes:3 Hidenao Fukuyama:1 Regine Kolinsky:2 
  • 1:Human Brain Research Center, Kyoto University Graduate School of Medicine 2:Faculty of Psychology, Université Libre de Bruxelles 3:University of Porto 

Previous neuroimaging studies have shown that visual objects and their mirror reversals are represented as being identical in the ventral visual stream. However, recent behavioral work suggests that this mirror invariance during visual recognition can change when behavioral tasks tap motor knowledge about visual objects. The present study used an fMRI adaptation paradigm to investigate the task-related change in mirror invariance in the human ventral and dorsal processing pathways. Participants performed a vision-for-perception task ("semantic categorization") and a vision-for-action task ("virtual grasping") with graspable visual objects. In each trial, a pair of object images were presented sequentially, with the second image of each pair being either: i) the same as the first image, ii) different only in identity, iii) different only in orientation (mirror or 180 degree rotation), iv) different in both identity and orientation. Our results revealed stronger effects of repetition suppression in the temporo-occipital region for the perception task relative to the action task, irrespective of the orientation of stimuli. Conversely, repetition suppression was greater in the occipito-parietal junction for the action task relative to the perception task for pair stimuli of same orientation. These results are largely consistent with the known functional organization of the ventral and dorsal streams for visual processing, and further suggest that these two systems show different patterns of mirror image sensitivity according to the behavioral contexts.

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