August 2009
Volume 9, Issue 8
Free
Vision Sciences Society Annual Meeting Abstract  |   August 2009
Invariance to mirror image reversals in the Lateral Occipital Complex (LOC) and Parahippocampal Place Area (PPA)
Author Affiliations
  • Jonas Kubilius
    McGovern Institute for Brain Research, MIT
  • Daniel D. Dilks
    McGovern Institute for Brain Research, MIT
  • Elizabeth S. Spelke
    Department of Psychology, Harvard University
  • Nancy Kanwisher
    McGovern Institute for Brain Research, MIT
Journal of Vision August 2009, Vol.9, 968. doi:10.1167/9.8.968
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      Jonas Kubilius, Daniel D. Dilks, Elizabeth S. Spelke, Nancy Kanwisher; Invariance to mirror image reversals in the Lateral Occipital Complex (LOC) and Parahippocampal Place Area (PPA). Journal of Vision 2009;9(8):968. doi: 10.1167/9.8.968.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Electrophysiological and behavioral studies in many species (e.g., octopus, pigeon, monkey, and human) have demonstrated mirror-image confusion for objects, perhaps because left/right information is rarely important in object recognition (e.g., a cup is the same cup when seen in left or right profile). However, unlike object recognition, scene recognition and navigation crucially require left/right information; the identity and navigability of a scene are completely different when it is mirror reversed. Thus, we predicted that object representations in object-selective cortex would be invariant to left/right reversals, but scene representations in the scene-selective cortex would not be. To test for such left/right information encoding, we ran an event-related fMRI adaptation experiment. In each trial, we successively presented images of either two objects or two scenes; each pair of images was: 1) the same image (presented twice); 2) two completely different images; or 3) a scene or an object, followed by the mirror-reversed version of the same stimulus. Consistent with our prediction, preliminary results showed partial invariance to the mirror reversals in the object-selective lateral occipital cortex (LOC), to a greater extent in its anterior subregion (posterior fusiform gyrus, pFs) than its posterior subregion (LO). However, contrary to our prediction, we also found invariance to left/right orientation for scenes in the parahippocampal place area (PPA). These findings pose a challenge to hypotheses of the PPA's role in scene recognition, navigation, and reorientation.

Kubilius, J. Dilks, D. D. Spelke, E. S. Kanwisher, N. (2009). Invariance to mirror image reversals in the Lateral Occipital Complex (LOC) and Parahippocampal Place Area (PPA) [Abstract]. Journal of Vision, 9(8):968, 968a, http://journalofvision.org/9/8/968/, doi:10.1167/9.8.968. [CrossRef]
Footnotes
 Supported in part by: NIH grants 13455 (NK), and a Kirschstein-NRSA EY017507 (DDD).
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