Zusammenfassung der Ressource
Motion Perception
- Uses
- motion of objects in the world.
- Attracts attention
- Figure-background segmentation
- Estimate depth (motion parallax)
- Infer form and 3D structure
- Infer action and type of actor from biological motion
- Types of Motion
- Ego motion
- Object motion
- Apparent motion
- Biological motion
- Motion parallax
- Components of Motion
- Direction
- Speed
- Velocity
- Computation of Visual Motion
- Motion aftereffect
- implies an opponent-process system, like that of colour vision
- Interocular transfer
- Result of activities of neurons in a part of the visual system
where information collected from two eyes is combined
- Input from both eyes is combined in area V1
- Recent studies: Locate site of motion aftereffects more precisely
- Aperture
- Correspondance problem
- Aperture problem
- Optic Flow
- Models for Motion Detection
- Spatiotemporal energy models for the perception of motion
- Elaborated Reichardt detectors
- Model of human visual-motion sensing
- Eye Movement
- Smooth pursuit
- Saccade
- problem of discriminating motion across the retina that is due to eye movements vs. object movements
- Motor system solves “problem” of why an object in motion may appear
stationary by sending out two copies of each order to move eyes
- One copy goes to eye muscles
- Another (“efference copy”) goes to an area of visual
system that has been dubbed “comparator”
- Comparator can then compensate for image changed caused by eye movement, inhibiting
any attempts by other parts of the visual system to interpret changes as object motion
- Akinetopsia
- caused by disruptions to the human cortical homolog of MT