Grant Proposal: The conditions of grouping features for object motion computation

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Grant ProposalThe conditions of grouping
features for object motion computation

• Grant proposal FM1
• Presented by Pieter van de Vijver

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Introduction

• Rotating dotted ellipses
• Motion perception -gt occlusion
• Speed illusion
• Aperture problem
• Illusionairy contours
• Local motion system
• Low level
• Group motion system
• High level
• Dominates local motion under certain grouping
  conditions

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Research Question

• Where does group-motion perception start and end?
• Only grouping if group motion is well known?
• Under what conditions does group motion overthrow
  local motion
• Interdot distance
• Grouping contours
• Basic forms (circles, squares etc)
• Complex objects

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PreExperiment interdot distance and figure
selection

• Create contours with a small interdot distance
• Basic forms (ellipses, squares, triangles e.d.)
• Compare speed perception when varying
  interfigural sizes
• Make 2 images rotate at the same speed
• For figures with speed illusion
• Change interdot distance

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Main Experiment

• Repeat speed illusion experiment with
• Basic forms
• Known (moving) complex objects
• Cars, bikes, people
• Unknown complex objects
• Random combination of geons

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Results?

• Does knowlegde of movement support use of group
  motion
• To what extend is group motion used
• Rough estimate for further research
• Further research
• 3D objects
• fMRI / EEG scans

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