Abstract
Original language | English |
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Article number | 17 |
Journal | Journal of Vision |
Volume | 8 |
Issue number | 10 |
DOIs | |
Publication status | Published - 30 Nov 2008 |
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Bibliographical note
Creative Commons Attribution Non-Commercial No Derivatives LicenseKeywords
- human vision
- complex motion
- V5
- MT
- MST
- intraparietal sulcus
- radial motion
- optic flow
- MEG
- hMSTs
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Optic flow in human vision: MEG reveals a foveo-fugal bias in V1, specialization for spiral space in hMSTs, and global motion sensitivity in the IPS. / Holliday, Ian E.; Meese, Timothy S.
In: Journal of Vision, Vol. 8, No. 10, 17, 30.11.2008.Research output: Contribution to journal › Article
TY - JOUR
T1 - Optic flow in human vision: MEG reveals a foveo-fugal bias in V1, specialization for spiral space in hMSTs, and global motion sensitivity in the IPS
AU - Holliday, Ian E.
AU - Meese, Timothy S.
N1 - Creative Commons Attribution Non-Commercial No Derivatives License
PY - 2008/11/30
Y1 - 2008/11/30
N2 - Abstract We recorded MEG responses from 17 participants viewing random-dot patterns simulating global optic flow components (expansion, contraction, rotation, deformation, and translation) and a random motion control condition. Theta-band (3–7 Hz), MEG signal power was greater for expansion than the other optic flow components in a region concentrated along the calcarine sulcus, indicating an ecologically valid, foveo-fugal bias for unidirectional motion sensors in V1. When the responses to the optic flow components were combined, a decrease in MEG beta-band (17–23 Hz) power was found in regions extending beyond the calcarine sulcus to the posterior parietal lobe (inferior to IPS), indicating the importance of structured motion in this region. However, only one cortical area, within or near the V5/hMT+ complex, responded to all three spiral-space components (expansion, contraction, and rotation) and showed no selectivity for global translation or deformation: we term this area hMSTs. This is the first demonstration of an exclusive region for spiral space in the human brain and suggests a functional role better suited to preliminary analysis of ego-motion than surface pose, which would involve deformation. We also observed that the rotation condition activated the cerebellum, suggesting its involvement in visually mediated control of postural adjustment.
AB - Abstract We recorded MEG responses from 17 participants viewing random-dot patterns simulating global optic flow components (expansion, contraction, rotation, deformation, and translation) and a random motion control condition. Theta-band (3–7 Hz), MEG signal power was greater for expansion than the other optic flow components in a region concentrated along the calcarine sulcus, indicating an ecologically valid, foveo-fugal bias for unidirectional motion sensors in V1. When the responses to the optic flow components were combined, a decrease in MEG beta-band (17–23 Hz) power was found in regions extending beyond the calcarine sulcus to the posterior parietal lobe (inferior to IPS), indicating the importance of structured motion in this region. However, only one cortical area, within or near the V5/hMT+ complex, responded to all three spiral-space components (expansion, contraction, and rotation) and showed no selectivity for global translation or deformation: we term this area hMSTs. This is the first demonstration of an exclusive region for spiral space in the human brain and suggests a functional role better suited to preliminary analysis of ego-motion than surface pose, which would involve deformation. We also observed that the rotation condition activated the cerebellum, suggesting its involvement in visually mediated control of postural adjustment.
KW - human vision
KW - complex motion
KW - V5
KW - MT
KW - MST
KW - intraparietal sulcus
KW - radial motion
KW - optic flow
KW - MEG
KW - hMSTs
UR - http://www.scopus.com/inward/record.url?scp=58149522499&partnerID=8YFLogxK
UR - http://www.journalofvision.org/content/8/10/17.full
U2 - 10.1167/8.10.17
DO - 10.1167/8.10.17
M3 - Article
VL - 8
JO - Journal of Vision
JF - Journal of Vision
SN - 1534-7362
IS - 10
M1 - 17
ER -