December 2003
Volume 3, Issue 12
Free
OSA Fall Vision Meeting Abstract  |   December 2003
fMRI of Glass patterns
Author Affiliations
  • Alex R. Wade
    Smith Kettlewell Eye Research Institute, USA
  • Anthony M Norcia
    Smith Kettlewell Eye Research Institute, USA
  • Vladimir Y. Vildavski
    Smith Kettlewell Eye Research Institute, USA
  • Mark Pettet
    Smith Kettlewell Eye Research Institute, USA
Journal of Vision December 2003, Vol.3, 50. doi:10.1167/3.12.50
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      Alex R. Wade, Anthony M Norcia, Vladimir Y. Vildavski, Mark Pettet; fMRI of Glass patterns. Journal of Vision 2003;3(12):50. doi: 10.1167/3.12.50.

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

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Abstract

The detection of Glass patterns requires long-range or global integration of local orientation signals across the visual field. The sites involved in this integration process are not yet known. We used functional MRI (fMRI) to identify human cortical areas that respond preferentially to Glass patterns alternating with random patterns comprised of the same local elements. The stimuli were designed to be compatible with both fMRI and VEP recording techniques. Using phase-encoded retinotopic mapping and functional localizer scans, we located the most significant Glass pattern fMRI activations with respect to known visual areas.

Consistent with a previous report, we find activations to the presentation of Glass patterns in both dorsal and ventral regions of occipital cortex, but little signal in striate cortex or early extrastriate visual areas. The strongest activations comprise two distinct foci: one anterior to V4 on the ventral surface, and one sited in or close to the V3A/B complex on the dorso-lateral surface.

Wade, A. R., Norcia, A. M., Vildavski, V. Y., Pettet, M.(2003). fMRI of Glass patterns [Abstract]. Journal of Vision, 3( 12): 50, 50a, http://journalofvision.org/3/12/50/, doi:10.1167/3.12.50. [CrossRef]
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