Global Motion Processing in Human Visual Cortical Areas V2 and V3. / Furlan, Michele; Smith, Andrew T.

In: The Journal of Neuroscience, Vol. 36, No. 27, 06.07.2016, p. 7314-7324.

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Global Motion Processing in Human Visual Cortical Areas V2 and V3. / Furlan, Michele; Smith, Andrew T.

In: The Journal of Neuroscience, Vol. 36, No. 27, 06.07.2016, p. 7314-7324.

Research output: Contribution to journalArticle

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Furlan, Michele ; Smith, Andrew T. / Global Motion Processing in Human Visual Cortical Areas V2 and V3. In: The Journal of Neuroscience. 2016 ; Vol. 36, No. 27. pp. 7314-7324.

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@article{7490cc3fcd764c669cf1bedd46ecbc4c,
title = "Global Motion Processing in Human Visual Cortical Areas V2 and V3",
abstract = "Global motion perception entails the ability to extract the central direction tendency from an extended area of visual space containing widely disparate local directions. A substantial body of evidence suggests that local motion signals generated in primary visual cortex (V1) are spatially integrated to provide perception of global motion, beginning in the middle temporal area (MT) in macaques and its counterpart in humans, hMT. However, V2 and V3 also contain motion-sensitive neurons that have larger receptive fields than those found in V1, giving the potential for spatial integration of motion signals. Despite this, V2 and V3 have been overlooked as sites of global motion processing. To test, free of local-global confounds, whether human V2 and V3 are important for encoding global motion, we developed a visual stimulus that yields a global direction yet includes all possible local directions and is perfectly balanced at the local motion level. We then attempted to decode global motion direction in such stimuli with multivariate pattern classification of fMRI data. We found strong sensitivity to global motion in hMT, as expected, and also in several higher visual areas known to encode optic flow. Crucially, we found that global motion direction could be decoded in human V2 and, particularly, in V3. The results suggest the surprising conclusion that global motion processing is a key function of cortical visual areas V2 and V3. A possible purpose is to provide global motion signals to V6.",
author = "Michele Furlan and Smith, {Andrew T}",
year = "2016",
month = "7",
day = "6",
doi = "10.1523/JNEUROSCI.0025-16.2016",
language = "English",
volume = "36",
pages = "7314--7324",
journal = "The Journal of Neuroscience",
issn = "0270-6474",
publisher = "Society for Neuroscience",
number = "27",

}

RIS

TY - JOUR

T1 - Global Motion Processing in Human Visual Cortical Areas V2 and V3

AU - Furlan, Michele

AU - Smith, Andrew T

PY - 2016/7/6

Y1 - 2016/7/6

N2 - Global motion perception entails the ability to extract the central direction tendency from an extended area of visual space containing widely disparate local directions. A substantial body of evidence suggests that local motion signals generated in primary visual cortex (V1) are spatially integrated to provide perception of global motion, beginning in the middle temporal area (MT) in macaques and its counterpart in humans, hMT. However, V2 and V3 also contain motion-sensitive neurons that have larger receptive fields than those found in V1, giving the potential for spatial integration of motion signals. Despite this, V2 and V3 have been overlooked as sites of global motion processing. To test, free of local-global confounds, whether human V2 and V3 are important for encoding global motion, we developed a visual stimulus that yields a global direction yet includes all possible local directions and is perfectly balanced at the local motion level. We then attempted to decode global motion direction in such stimuli with multivariate pattern classification of fMRI data. We found strong sensitivity to global motion in hMT, as expected, and also in several higher visual areas known to encode optic flow. Crucially, we found that global motion direction could be decoded in human V2 and, particularly, in V3. The results suggest the surprising conclusion that global motion processing is a key function of cortical visual areas V2 and V3. A possible purpose is to provide global motion signals to V6.

AB - Global motion perception entails the ability to extract the central direction tendency from an extended area of visual space containing widely disparate local directions. A substantial body of evidence suggests that local motion signals generated in primary visual cortex (V1) are spatially integrated to provide perception of global motion, beginning in the middle temporal area (MT) in macaques and its counterpart in humans, hMT. However, V2 and V3 also contain motion-sensitive neurons that have larger receptive fields than those found in V1, giving the potential for spatial integration of motion signals. Despite this, V2 and V3 have been overlooked as sites of global motion processing. To test, free of local-global confounds, whether human V2 and V3 are important for encoding global motion, we developed a visual stimulus that yields a global direction yet includes all possible local directions and is perfectly balanced at the local motion level. We then attempted to decode global motion direction in such stimuli with multivariate pattern classification of fMRI data. We found strong sensitivity to global motion in hMT, as expected, and also in several higher visual areas known to encode optic flow. Crucially, we found that global motion direction could be decoded in human V2 and, particularly, in V3. The results suggest the surprising conclusion that global motion processing is a key function of cortical visual areas V2 and V3. A possible purpose is to provide global motion signals to V6.

U2 - 10.1523/JNEUROSCI.0025-16.2016

DO - 10.1523/JNEUROSCI.0025-16.2016

M3 - Article

VL - 36

SP - 7314

EP - 7324

JO - The Journal of Neuroscience

JF - The Journal of Neuroscience

SN - 0270-6474

IS - 27

ER -