Summation of visual motion across eye movements reflects a nonspatial decision mechanism

Morris, AP, Liu, CC, Cropper, SJ, Forte, JD, Krekelberg, B and Mattingley, JB (2010) Summation of visual motion across eye movements reflects a nonspatial decision mechanism. Journal of Neuroscience, 30 29: 9821-9830. doi:10.1523/JNEUROSCI.1705-10.2010

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Author Morris, AP
Liu, CC
Cropper, SJ
Forte, JD
Krekelberg, B
Mattingley, JB
Title Summation of visual motion across eye movements reflects a nonspatial decision mechanism
Journal name Journal of Neuroscience   Check publisher's open access policy
ISSN 0270-6474
Publication date 2010-07-01
Year available 2010
Sub-type Article (original research)
DOI 10.1523/JNEUROSCI.1705-10.2010
Open Access Status File (Publisher version)
Volume 30
Issue 29
Start page 9821
End page 9830
Total pages 10
Place of publication Washington, DC, United States
Publisher Society for Neuroscience
Language eng
Abstract Human vision remains perceptually stable even though retinal inputs change rapidly with each eye movement. Although the neural basis of visual stability remains unknown, a recent psychophysical study pointed to the existence of visual feature-representations anchored in environmental rather than retinal coordinates (e.g., "spatiotopic" receptive fields; Melcher and Morrone, 2003). In that study, sensitivity to a moving stimulus presented after a saccadic eye movement was enhanced when preceded by another moving stimulus at the same spatial location before the saccade. The finding is consistent with spatiotopic sensory integration, but it could also have arisen from a probabilistic improvement in performance due to the presence of more than one motion signal for the perceptual decision. Here we show that this statistical advantage accounts completely for summation effects in this task. We first demonstrate that measurements of summation are confounded by noise related to an observer's uncertainty about motion onset times. When this uncertainty is minimized, comparable summation is observed regardless of whether two motion signals occupy the same or different locations in space, and whether they contain the same or opposite directions of motion. These results are incompatible with the tuning properties of motion-sensitive sensory neurons and provide no evidence for a spatiotopic representation of visual motion. Instead, summation in this context reflects a decision mechanism that uses abstract representations of sensory events to optimize choice behavior. Copyright © 2010 the authors.
Keyword Probability summation
Successive fixations
Parietal Cortex
Area Mt
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID 525487
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Psychology Publications
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Citation counts: TR Web of Science Citation Count  Cited 21 times in Thomson Reuters Web of Science Article | Citations
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Created: Sun, 08 Aug 2010, 10:03:52 EST