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    Visual motion modulates pattern sensitivity ahead, behind, and beside motion

    Access Status
    Open access via publisher
    Authors
    Arnold, D.
    Marinovic, Welber
    Whitney, D.
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Arnold, D. and Marinovic, W. and Whitney, D. 2014. Visual motion modulates pattern sensitivity ahead, behind, and beside motion. Vision Research. 98: pp. 99-106.
    Source Title
    Vision Research
    DOI
    10.1016/j.visres.2014.03.003
    ISSN
    0042-6989
    School
    School of Psychology and Speech Pathology
    URI
    http://hdl.handle.net/20.500.11937/50270
    Collection
    • Curtin Research Publications
    Abstract

    Retinal motion can modulate visual sensitivity. For instance, low contrast drifting waveforms (targets) can be easier to detect when abutting the leading edges of movement in adjacent high contrast waveforms (inducers), rather than the trailing edges. This target-inducer interaction is contingent on the adjacent waveforms being consistent with one another - in-phase as opposed to out-of-phase. It has been suggested that this happens because there is a perceptually explicit predictive signal at leading edges of motion that summates with low contrast physical input - a 'predictive summation'. Another possible explanation is a phase sensitive 'spatial summation', a summation of physical inputs spread across the retina (not predictive signals). This should be non-selective in terms of position - it should be evident at leading, adjacent, and at trailing edges of motion. To tease these possibilities apart, we examined target sensitivity at leading, adjacent, and trailing edges of motion. We also examined target sensitivity adjacent to flicker, and for a stimulus that is less susceptible to spatial summation, as it sums to grey across a small retinal expanse. We found evidence for spatial summation in all but the last condition. Finally, we examined sensitivity to an absence of signal at leading and trailing edges of motion, finding greater sensitivity at leading edges. These results are inconsistent with the existence of a perceptually explicit predictive signal in advance of drifting waveforms. Instead, we suggest that phase-contingent target-inducer modulations of sensitivity are explicable in terms of a directionally modulated spatial summation.

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