November 2002
Volume 2, Issue 7
Free
Vision Sciences Society Annual Meeting Abstract  |   November 2002
Processing 3-dimensional structure from motion in humans and macaques
Author Affiliations
  • W. Vanduffel
    Neuro- and Psychophysiology Laboratory, KULeuven Medical School
Journal of Vision November 2002, Vol.2, 116. doi:10.1167/2.7.116
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      W. Vanduffel, D. Fize, H. Peuskens, K. Denys, S. Sunaert, J.T. Todd, G.A. Orban; Processing 3-dimensional structure from motion in humans and macaques. Journal of Vision 2002;2(7):116. doi: 10.1167/2.7.116.

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

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Abstract

Single unit studies in monkeys suggested that area MT/V5 might be implicated in the extraction of the 3-dimensional structure of objects based upon motion cues only (Xiao et al., 1997, see also Bradley et al. 1998). The involvement of the presumptive human homologue of macaque MT/V5 (the human MT/V5+ complex) in the processing of 3D-structure-from-motion (3D-SFM) has been confirmed using fMRI (Orban et al., 1999). In addition, the latter study showed significant 3D-SFM sensitivity in a lateral occipital region and several regions in the intraparietal sulcus. In the present study, we bridged the gap between human functional imaging and monkey electrophysiology by performing contrast-agent enhanced fMRI experiments in awake monkeys (Vanduffel et al., 2001). Therefore, 8 human subjects and three monkeys were trained to fixate in the scanner while we presented two-dimensional and three-dimensional configurations of moving random lines. The human fMRI results were in agreement with those published. In monkey, the comparison of 3D versus the 2D dynamic displays revealed bilateral MR-activation in MT/V5, FST but not MST, as well as in areas V4, and VP. Smaller 3D-SFM sensitive MR-activation was observed in the intraparietal sulcus and several foci along the STS (anterior and ventral relative to FST). These results provide additional evidence that:

  1. macaque MT/V5 is involved in the extraction of three-dimensional structure-from-motion, in agreement with single unit results,

  2. human MT/V5+ might consist of several areas including homologous areas to macaque areas MT/V5 and FST,

  3. there is an functional asymmetry between human and monkey intraparietal areas: human IPS is more involved in the processing of 3D-SFM compared to monkey IPS. sponsored by EU-project MAPAWAMO, and GSKE

Vanduffel, W., Fize, D., Peuskens, H., Denys, K., Sunaert, S., Todd, J. T., Orban, G. A.(2002). Processing 3-dimensional structure from motion in humans and macaques [Abstract]. Journal of Vision, 2( 7): 116, 116a, http://journalofvision.org/2/7/116/, doi:10.1167/2.7.116. [CrossRef]
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