August 2009
Volume 9, Issue 8
Free
Vision Sciences Society Annual Meeting Abstract  |   August 2009
Slowing vision: Pattern Pulse MultiFocal Visual Evoked Potential (PPmfVEP) timing dilation under Isoluminant and Luminance Contrast Conditions
Author Affiliations
  • Samuel Inverso
    ARC Centre of Excellence in Vision Science, and Visual Sciences Group, Research School of Biological Sciences, The Australian National University
  • Xin-Lin Goh
    ARC Centre of Excellence in Vision Science, and Visual Sciences Group, Research School of Biological Sciences, The Australian National University
  • Andrew James
    ARC Centre of Excellence in Vision Science, and Visual Sciences Group, Research School of Biological Sciences, The Australian National University
Journal of Vision August 2009, Vol.9, 314. doi:10.1167/9.8.314
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      Samuel Inverso, Xin-Lin Goh, Andrew James; Slowing vision: Pattern Pulse MultiFocal Visual Evoked Potential (PPmfVEP) timing dilation under Isoluminant and Luminance Contrast Conditions. Journal of Vision 2009;9(8):314. doi: 10.1167/9.8.314.

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

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Abstract

Purpose: The magnocellular (M) pathway's contributions to PPmfVEPs was examined by comparing VEP characteristics with isoluminant (ISO) colour and diffuse red background dartboards against Luminance Contrast (LC) dartboards.

Methods: Participants (n=5) observed stimuli through a stereoscopic display (two screens viewed via mirrors at 45°; lenses gave an effective infinity viewing distance). Stimulus was an 84 region cortically scaled dartboard, eccentricity 23° 4x4 checkerboards briefly pulsed pseudo-randomly (mean frequency 2/second/region). Ten conditions were tested with 30 or 60 cd/m2 mean luminance and grey or chromatic (red-green) checks yielding six LC and four ISO conditions. RGB values were selected with a photometer. Participants viewed a 30Hz reversing dartboard of all regions; for ISO they made it not flicker; for LC they verified it flickered, they then viewed PP dartboards (four 1 minute segments per condition). 64 channels were recorded at 256Hz.

Results: ISO produced a response delayed in initial rise and in peak relative to LC reflecting the absence of faster M pathway transmission for ISO. 90% of the channels were significant (pConclusions: PP presentation has better SNR than traditional contrast reversing stimuli, allowing for more conditions in a reasonable length session. This research is the first usage of PPmfVEPs to identify M pathway effects. Potential applications include Dyslexia and Schizophrenia, which have a correspondence with dysfunctional M pathways.

Inverso, S. Goh, X.-L. James, A. (2009). Slowing vision: Pattern Pulse MultiFocal Visual Evoked Potential (PPmfVEP) timing dilation under Isoluminant and Luminance Contrast Conditions [Abstract]. Journal of Vision, 9(8):314, 314a, http://journalofvision.org/9/8/314/, doi:10.1167/9.8.314. [CrossRef]
Footnotes
 ARC Centre of Excellence in Vision Science.
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