Gilaie-Dotan, S;
(2016)
Visual motion serves but is not under the purview of the dorsal pathway.
Neuropsychologia
, 89
pp. 378-392.
10.1016/j.neuropsychologia.2016.07.018.
Preview |
Text
Gilaie-Dotan_Gilaie-Dotan_motionPathway_2016.pdf - Published Version Download (723kB) | Preview |
Abstract
Visual motion processing is often attributed to the dorsal visual pathway despite visual motion’s involvement in almost all visual functions. Furthermore, some visual motion tasks critically depend on the structural integrity of regions outside the dorsal pathway. Here, based on numerous studies, I propose that visual motion signals are swiftly transmitted via multiple non-hierarchical routes to primary motion-dedicated processing regions (MT/V5 and MST) that are not part of the dorsal pathway, and then propagated to a multiplicity of brain areas according to task demands, reaching these regions earlier than the dorsal/ventral hierarchical flow. This not only places MT/V5 at the same or even earlier visual processing stage as that of V1, but can also elucidate many findings with implications to visual awareness. While the integrity of the non-hierarchical motion pathway is necessary for all visual motion perception, it is insufficient on its own, and the transfer of visual motion signals to additional brain areas is crucial to allow the different motion perception tasks (e.g. optic flow, visuo-vestibular balance, movement observation, dynamic form detection and perception, and even reading). I argue that this lateral visual motion pathway can be distinguished from the dorsal pathway not only based on faster response latencies and distinct anatomical connections, but also based on its full field representation. I also distinguish between this primary lateral visual motion pathway sensitive to all motion in the visual field, and a much less investigated optic flow sensitive medial processing pathway (from V1 to V6 and V6A) that appears to be part of the dorsal pathway. Multiple additional predictions are provided that allow testing this proposal and distinguishing between the visual pathways.
| Type: | Article |
|---|---|
| Title: | Visual motion serves but is not under the purview of the dorsal pathway |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.neuropsychologia.2016.07.018 |
| Publisher version: | http://dx.doi.org/10.1016/j.neuropsychologia.2016.... |
| Language: | English |
| Additional information: | © 2016 The Author. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). |
| Keywords: | Science & Technology, Social Sciences, Life Sciences & Biomedicine, Behavioral Sciences, Neurosciences, Psychology, Experimental, Neurosciences & Neurology, Psychology, Where And What Pathways, Action And Perception Pathways, Visual Hierarchy, Motion Perception, Motion Processing, Mt/v5, Visual Movement, Visual System, V6 Complex, Transcranial Magnetic Stimulation, Superior Temporal Sulcus, Anterior Intraparietal Area, Pursuit Eye-Movements, Perception Following Lesions, Midline Cerebellar Lesions, Primate Cerebral-Cortex, Bilateral Brain-Damage, Monkey Striate Cortex, Optic Flow Responses |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1513739 |
Archive Staff Only
 |
View Item |
