Testing Theories of Visual Position Perception by Manipulating Magnocellular Processing for Various Motion Trajectories
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1
Griffith University, Australia
Spatial projection theories of visual localization posit that a moving stimulus’ perceived position is projected forwards in order to compensate for processing delays (Eagleman & Sejnowski, 2007; Nijhawan, 2008). Temporal integration theories (Krekelberg & Lappe, 2000) suggest that an averaging over positions occupied by the moving stimulus for a period of time is the dominant process underlying perception of position. Contrary to the predictions of these theories, reducing magnocellular (M) pathway processing by making stimuli equiluminant, and adding luminance noise (see Fig. 1A), had the opposite effect on localization judgments, assessed via the flash-lag illusion, when a smooth, continuous trajectory was used, compared to when the moving object suddenly appeared, or suddenly reversed direction (Fig. 1B, for interaction, F[2, 22] = 59.91, p = 1.3 × 10-9, eta_P^2 = .85). In addition, we have preliminary data indicating that simply reducing the contrast of the moving stimulus, without adding luminance noise, also yields a cross-over interaction similar to that shown in Fig. 1B.
In order to explain the perception of the position of moving objects across all trajectories, our cross-over interaction result necessitates processes additional to those proposed by either the spatial projection or temporal integration theories. It also calls into question the utility of the onset and reversal trajectories for testing theories of localization for continuous trajectories.
Acknowledgements
We would like to thank Kathy T Mullen for helpful discussions, and David Hardwick for assistance with data checking and graphics. We would like to acknowledge the support of the Applied Cognitive Neuroscience Research Unit, Behavioural Basis of Health, Griffith Health Institute.
Keywords:
visual,
localization,
Theory,
spatial extrapolation,
Temporal Integration,
flash-lag illusion,
trajectories,
Magnocelluar pathway
Conference:
ACNS-2012 Australasian Cognitive Neuroscience Conference, Brisbane, Australia, 29 Nov - 2 Dec, 2012.
Presentation Type:
Oral Presentation
Topic:
Sensation and Perception
Citation:
Chappell
M,
Potter
Z and
Hine
TJ
(2012). Testing Theories of Visual Position Perception by Manipulating Magnocellular Processing for Various Motion Trajectories.
Conference Abstract:
ACNS-2012 Australasian Cognitive Neuroscience Conference.
doi: 10.3389/conf.fnhum.2012.208.00130
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Received:
25 Oct 2012;
Published Online:
17 Nov 2012.
*
Correspondence:
Dr. Mark Chappell, Griffith University, Brisbane, Australia, m.chappell@griffith.edu.au