August 2012
Volume 12, Issue 9
Free
Vision Sciences Society Annual Meeting Abstract  |   August 2012
The human foveal confluence and high resolution fMRI
Author Affiliations
  • Mark M. Schira
    Neuroscience Research Australia (NeuRA), Sydney & University of New South Wales, Sydney, Australia
Journal of Vision August 2012, Vol.12, 1396. doi:10.1167/12.9.1396
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      Mark M. Schira; The human foveal confluence and high resolution fMRI. Journal of Vision 2012;12(9):1396. doi: 10.1167/12.9.1396.

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

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Abstract

After remaining terra incognita for 40 years, the detailed organization of the foveal confluence has just recently been described in humans. I will present recent high resolution mapping results in human subjects and introduce current concepts of its organization in human and other primates (Schira et al., J. Nsci, 2009). I will then introduce a new algebraic retino-cortical projection function that accurately models the V1-V3 complex to the level of our knowledge about the actual organization (Schira et al. PLoS Comp. Biol. 2010). Informed by this model I will discuss important properties of foveal cortex in primates. These considerations demonstrate that the observed organization though surprising at first hand is in fact a good compromise with respect to cortical surface and local isotropy, proving a potential explanation for this organization. Finally, I will discuss recent advances such as multi-channel head coils and parallel imaging which have greatly improved the quality and possibilities of MRI. Unfortunately, most fMRI research is still essentially performed in the same old 3 by 3 by 3 mm style - which was adequate when using a 1.5T scanner and a birdcage head coil. I will introduce simple high resolution techniques that allow fairly accurate estimates of the foveal organization in research subjects within a reasonable timeframe of approximately 20 minutes, providing a powerful tool for research of foveal vision.

Meeting abstract presented at VSS 2012

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