Psychology 2115A/B Lecture Notes - Interstimulus Interval, Optical Flow, Retina

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Published on 20 Apr 2013
School
Western University
Department
Psychology
Course
Psychology 2115A/B
Chapter 8 Review: Motion
By the end of this section, you should know:
- Functions of motion
- Two approaches to motion perception
- Motion coherence
- Corollary discharge theory
Motion
Perception is a creation
o Our perception of motion is a creation of the nervous system
o The fact that we can perceive motion in a static image tells you that it is created and not actually
there
Depends on more than just sensation
o Depends on more than just what is presented on the retina
Involves interactions between systems
o Our own movement gives us clues about the movement of other objects
Perception involves top-down processes
o When we think about motion, we are also looking at heuristics about how we think the world
ought to work
o We impose cognition on what is happening
Not just a simple calculation of how much an image is moving across the retina, it is an interaction of
a lot of factors
Function of Motion Perception
Understand the environment
o Thinks are moving around us and we need to know what is going on around us to successfully
navigate
o Movement is a critical piece of the world and of understanding how the world works
o Women who had a stroke that affected area MT and now has motion agnosia: difficulty in seeing
moving objects
o Her deficit tells us how important movement is to our everyday lives
o Understanding optic flow: objects are moving relative to the observer (in the opposite direction)
Attract attention
o Movement ruins camouflage
Information about objects
o Our movement around the world tells us about the 3D nature of the objects around us
o Provides us key information about how objects work
4 Ways to Create the Perception of Movement
1. Real movement: something actually moving
o Moving an object across your field of view
2. Apparent movement: perception of movement even though nothing is actually moving
o The inter-stimulus interval between the two images
3. Induced movement: an illusion of movement when one object creates the perception of movement in
another object
4. Movement after effect: feeling as though you are still in motion after the actual motion has stopped
Real vs. Apparent Motion
Larson et al. fMRI experiment: Same or different neural mechanism?
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Document Summary

By the end of this section, you should know: Perception is a creation: our perception of motion is a creation of the nervous system, the fact that we can perceive motion in a static image tells you that it is created and not actually there. Depends on more than just sensation: depends on more than just what is presented on the retina. Involves interactions between systems: our own movement gives us clues about the movement of other objects. Perception involves top-down processes: when we think about motion, we are also looking at heuristics about how we think the world ought to work, we impose cognition on what is happening. Not just a simple calculation of how much an image is moving across the retina, it is an interaction of a lot of factors. Information about objects: our movement around the world tells us about the 3d nature of the objects around us, provides us key information about how objects work.

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