VSP Motion Perception

What is the illusion of motion of one's entire self, as a result of motion in one's peripheral visual field?

What does info about an object motion involve?

What does the retina use to percieve motion?

What two ways can retinal motion occur?

What is the perceptual disappearance of a stabilized retinal image called?

Will high or low spatial frequncies fade easier?

The human visual system is sensitive to ? in light simulation

The minimum amplitude of perceivable motion varies with what?

How small of a movement does stimulus need to make for a person to detect it?

How slowly can the stimulus move for a person to barely detect that it is moving? what is this called?

Does percievable velocity incr or decr with increasing luminance?

5 ways by which an object might appear to move

What is it called when a small, stationary object viewed against an otherwise completely featureless VF will appear to move about randomly w/in a small area even though it's not really moving?

What is it called when a stationary object appears to move due to the motion of surrounding objects or contours?

Induced motion is always percieved to be in what direction compared to that of the inducing objects and contours?

Special case of induced motion that only operates accross very short distances.

Illusory changes in the perception of motion that occur during prolonged viewing of moving objects or contours.

Illusory perception of motion of stationary objects or changes in the perception of motion of moving objects after prolonged viewing of moving objects of contours.

Prolonged viewing of an object moving at constant velocity may cause a decrease in the percieved speed of motion

Motion detection and contrast detection thresholds increase during prolonged vieweing of moving objects or contours but only for objects or contours moving in the same or similar direction

Motion after effect (MAE) demonstrates...

If the field viewed after adaptation contains contours moving in a direction w/in 30 degr of that of the adaptingmotion, the percieved direction of their motion may be altered by the adaptation.

Examples of the motion after effect

Illusory motion resulting from the successive presentation of a stimulus at different locations along a continuous path. Also called>

example of stroboscopic motion

4 types of stroboscopic motion

illusory motion of 2 stimuli in reverse direction when the luminance of one is signif higher than other

illusory expansion and contraction of an object as its luminance is incr or decr on successive presentations

illusory motion of an object due to successive presenations at optimally spaced positions along a continuous path

illusory expansion or contraction of and object d/t successive presentations of difference sizes of the object

Laws that describe the relationships among various stimulus parameters necessry to maintain optimum phi motion when andy one parameter is changed.

Korte's laws; if you incr luminance you have to:

Korte's laws; if you increase ISI (interstimulus interval) you have to:

Which order of motion stimuli is the movement of areas or contours that is defined by their luminance.
Changing luminance over time

Which order of motion stimuli is defined by mvnt of areas whose contours or shapes are defined by texture; and NOT by luminance. Example?

Which order of motion stimuli is defined by mvnt of areas defined as "figure" with neither luminance nor texture boundaries. Example?

Motion of elements that all share the same velocity (direction and speed) of motion. and what order of motion perception is this?

The object that we see is moving, using both eyes.

Cyclopean motion; Coherent motion against a static random element background.

Cyclopean motion; Coherent motion against a dynamic random element background (background in which each background element undergoes spatial displacements of random direction and/or magnitude)

LIke random element stereograms , random element motion displays req solution of a...

Minimum proportion of elements in a dynamic random element disply that must undergo the same velocity of motion for this to be detected.

Describe a clinical application of coherent motion threshold.

Minimum spatial displacemtn of elements necessary for the perception of stroboscopic motion

Clinical Example of the minimum displacement threshold (Dmin

What is the maximum spatial displacement of elements that supports the perception of 2nd order motion? example

Typical the maximum displacement threshold (Dmax) is

2 parts of Braddicks 2 process model of motion perception

Which part of Braddick's model supports 1st order motion (eg: continuous and phi motion)

Which part of Braddick's model supports 2nd order stroboscopic motion ?

Which motion perception of Braddicks model has spatial displacemnts within the Dmin to Dmax range?

Which motion perception of Braddicks model that operates with displacement larger than Dmax

What does Braddicks model rely heavily upon?

In this Order of motion the perception of motion for stimuli whose contours are defined only by differences in color without any luminance or texture differences is very weak when compared with motion of stimuli definced by luminance or texture

Remaining 3rd order motion is thought most likely to depend on which pathway?

Sometimes a motion of a stimulus is...

This may influence perception of the direction of motion within
Example?

Averaging of component motion vectors. The brain must average the direction of all stimuni it sees to decide which way things are moving.

Correlations of motion velocity from different portions of a display. If sufficiently consistent witha a rigid transformation of size and shape in 3D space, may elicit the perception of depth from a 2D display.