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Transcript of Motion Perception
Motion Perception Project
Without the ability to perceive motion, we are unable to do the following activities:
Suppose an engineering team is trying to design a device that can be used by individuals with motion agnosia to help them navigate their environments. We are hired as a consultant to provide advice on the types of information that this motion detector device will need to be able to process.
1. Consider the ways in which we rely on motion perception in our daily lives.
2. Consider the types of information that are needed in order to perceive motion correctly.
What is agnosia?
AKINETOPSIA is a type of agnosia that is associated with the inability to perceive motion. It is caused by the lesions in the visual cortex.
The motion detector device should be able to process the following:
different types of motion
recognition of pattern
interaction with vision
first and second order motion
The device must have the capability to detect the two movement detectors that people with akinetopsia cannot do.
***The device must detect real motion detectors in V3 because it will help the patients detect the motion in their surrounding whether their eyes are moving or not.
*** One of the motion detectors is our neurons in the medial temporal cortex. The device must be have the ability to communicate with neurons so that someone who has akinestopia will be able to response to motion in a particular direction.
***The device must also be able to detect recognition of patterns because it one of the main key that affects our perception of movement.
...biological movement- http://www.biomotionlab.ca/Demos/BMLwalker.html
***It is highly important for the motion detector device to interact with vision. Our visual cues can affect our balance; therefore, it affects our perception of movement. The device needs to be able to coordinate the eye movements with the head movements in order to stabilize the visual field.
The four types of motion perceptions are:
Real movement, apparent movement, induced movement, and movement after-effect.
***It is imperative that the device will be able to detect and analyze these four things because it the basic connection to how we perceive motion. Each of these has different characteristics that enable us to perceive motion.
Although sometimes our perception of motions deceives us, it is crucial for an individual to perceive motion. Without movement perception, we will have trouble with shapes, navigation, recognition, and etc. If we are not able to perceive any motion, the world will be like a frozen glacier.
changes in the size of the objects
***objects moving away get smaller while objects moving closer get bigger.
perception of motion of an object that
differs in luminance.
***detectors that work this way are called Reichardt detectors
moving contour is defined by contrast, texture, flicker, or some quality that does not result in an increase in luminance.
Agnosia affects only a single information pathway in the brain.