title: A Possible Role for End-Stopped V1 Neurons in the Perception of Motion: A Computational Model.
abstract: We present a model of the early stages of processing in the visual cortex, in particular V1 and MT, to investigate the potential role of end-stopped V1 neurons in solving the aperture problem. A hierarchical network is used in which the incoming motion signals provided by complex V1 neurons and end-stopped V1 neurons proceed to MT neurons at the next stage. MT neurons are categorized into two types based on their function: integration and segmentation. The role of integration neurons is to propagate unambiguous motion signals arriving from those V1 neurons that emphasize object terminators (e.g. corners). Segmentation neurons detect the discontinuities in the input stimulus to control the activity of integration neurons. Although the activity of the complex V1 neurons at the terminators of the object accurately represents the direction of the motion, their level of activity is less than the activity of the neurons along the edges. Therefore, a model incorporating end-stopped neurons is essential to suppress ambiguous motion signals along the edges of the stimulus. It is shown that the unambiguous motion signals at terminators propagate over the rest of the object to achieve an accurate representation of motion.
authors.affiliation: NeuroEngineering Laboratory, Dept Electrical & Electronic Engineering, The University of Melbourne, Parkville, VIC 3010, Australia.|NICTA Victorian Research Laboratory, Parkville, VIC 3010, Australia.
authors.forename: Parvin
authors.initials: P
authors.lastname: Zarei Eskikand
authors.affiliation: NeuroEngineering Laboratory, Dept Electrical & Electronic Engineering, The University of Melbourne, Parkville, VIC 3010, Australia.
authors.forename: Tatiana
authors.initials: T
authors.lastname: Kameneva
authors.affiliation: National Vision Research Institute, Australian College of Optometry, Carlton, VIC 3053, Australia.
authors.forename: Michael R
authors.initials: MR
authors.lastname: Ibbotson
authors.affiliation: NeuroEngineering Laboratory, Dept Electrical & Electronic Engineering, The University of Melbourne, Parkville, VIC 3010, Australia.
authors.forename: Anthony N
authors.initials: AN
authors.lastname: Burkitt
authors.affiliation: NeuroEngineering Laboratory, Dept Electrical & Electronic Engineering, The University of Melbourne, Parkville, VIC 3010, Australia.|Centre for Neural Engineering, The University of Melbourne, Parkville, VIC 3030, Australia.
authors.forename: David B
authors.initials: DB
authors.lastname: Grayden
mesh_terms: D000465:Algorithms; D000818:Animals; D006801:Humans; D008959:Models, Neurological; D009039:Motion Perception / Q000502:physiology*; D009474:Neurons / Q000502:physiology*; D014793:Visual Cortex / Q000502:physiology