Natural motion trajectory enhances the coding of speed in primate extrastriate cortex

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The ability to estimate the speed of an object irrespective of size or texture is a crucial function of the visual system. However, previous studies have suggested that the neuronal coding of speed in the middle temporal area (MT, a key cortical area for motion analysis in primates) is ambiguous, with most neurons changing their speed tuning depending on the spatial frequency (SF) of a visual pattern. Here we demonstrate that the ability of MT neurons to encode speed is markedly improved when stimuli follow a trajectory across the visual field, prior to entering their receptive fields. We also show that this effect is much less marked in the primary visual area. These results indicate that MT neurons build up on computations performed at earlier levels of the visual system to provide accurate coding of speed in natural situations, and provide additional evidence that nonlinear pooling underlie motion processing.
Original languageEnglish
Article number19739
Number of pages14
JournalScientific Reports
Volume6
DOIs
Publication statusPublished - 27 Jan 2016

Keywords

  • sensory processing
  • visual system

Cite this

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title = "Natural motion trajectory enhances the coding of speed in primate extrastriate cortex",
abstract = "The ability to estimate the speed of an object irrespective of size or texture is a crucial function of the visual system. However, previous studies have suggested that the neuronal coding of speed in the middle temporal area (MT, a key cortical area for motion analysis in primates) is ambiguous, with most neurons changing their speed tuning depending on the spatial frequency (SF) of a visual pattern. Here we demonstrate that the ability of MT neurons to encode speed is markedly improved when stimuli follow a trajectory across the visual field, prior to entering their receptive fields. We also show that this effect is much less marked in the primary visual area. These results indicate that MT neurons build up on computations performed at earlier levels of the visual system to provide accurate coding of speed in natural situations, and provide additional evidence that nonlinear pooling underlie motion processing.",
keywords = "sensory processing, visual system",
author = "Davies, {Amanda J.} and Chaplin, {Tristan A.} and Rosa, {Marcello G. P.} and Hsin-Hao Yu",
year = "2016",
month = "1",
day = "27",
doi = "10.1038/srep19739",
language = "English",
volume = "6",
journal = "Scientific Reports",
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}

Natural motion trajectory enhances the coding of speed in primate extrastriate cortex. / Davies, Amanda J.; Chaplin, Tristan A.; Rosa, Marcello G. P.; Yu, Hsin-Hao.

In: Scientific Reports, Vol. 6, 19739, 27.01.2016.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Natural motion trajectory enhances the coding of speed in primate extrastriate cortex

AU - Davies, Amanda J.

AU - Chaplin, Tristan A.

AU - Rosa, Marcello G. P.

AU - Yu, Hsin-Hao

PY - 2016/1/27

Y1 - 2016/1/27

N2 - The ability to estimate the speed of an object irrespective of size or texture is a crucial function of the visual system. However, previous studies have suggested that the neuronal coding of speed in the middle temporal area (MT, a key cortical area for motion analysis in primates) is ambiguous, with most neurons changing their speed tuning depending on the spatial frequency (SF) of a visual pattern. Here we demonstrate that the ability of MT neurons to encode speed is markedly improved when stimuli follow a trajectory across the visual field, prior to entering their receptive fields. We also show that this effect is much less marked in the primary visual area. These results indicate that MT neurons build up on computations performed at earlier levels of the visual system to provide accurate coding of speed in natural situations, and provide additional evidence that nonlinear pooling underlie motion processing.

AB - The ability to estimate the speed of an object irrespective of size or texture is a crucial function of the visual system. However, previous studies have suggested that the neuronal coding of speed in the middle temporal area (MT, a key cortical area for motion analysis in primates) is ambiguous, with most neurons changing their speed tuning depending on the spatial frequency (SF) of a visual pattern. Here we demonstrate that the ability of MT neurons to encode speed is markedly improved when stimuli follow a trajectory across the visual field, prior to entering their receptive fields. We also show that this effect is much less marked in the primary visual area. These results indicate that MT neurons build up on computations performed at earlier levels of the visual system to provide accurate coding of speed in natural situations, and provide additional evidence that nonlinear pooling underlie motion processing.

KW - sensory processing

KW - visual system

UR - http://www.ncbi.nlm.nih.gov/pubmed/26813361

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