Direct evidence for encoding of motion streaks in human visual cortex
Identifieur interne : 002454 ( Pmc/Corpus ); précédent : 002453; suivant : 002455Direct evidence for encoding of motion streaks in human visual cortex
Auteurs : Deborah Apthorp ; D. Samuel Schwarzkopf ; Christian Kaul ; Bahador Bahrami ; David Alais ; Geraint ReesSource :
- Proceedings of the Royal Society B: Biological Sciences [ 0962-8452 ] ; 2013.
Abstract
Temporal integration in the visual system causes fast-moving objects to generate static, oriented traces (‘motion streaks’), which could be used to help judge direction of motion. While human psychophysics and single-unit studies in non-human primates are consistent with this hypothesis, direct neural evidence from the human cortex is still lacking. First, we provide psychophysical evidence that faster and slower motions are processed by distinct neural mechanisms: faster motion raised human perceptual thresholds for static orientations parallel to the direction of motion, whereas slower motion raised thresholds for orthogonal orientations. We then used functional magnetic resonance imaging to measure brain activity while human observers viewed either fast (‘streaky’) or slow random dot stimuli moving in different directions, or corresponding static-oriented stimuli. We found that local spatial patterns of brain activity in early retinotopic visual cortex reliably distinguished between static orientations. Critically, a multivariate pattern classifier trained on brain activity evoked by these
Url:
DOI: 10.1098/rspb.2012.2339
PubMed: 23222445
PubMed Central: 3574303
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