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Masking
N/A
10
Science
Professional
12/14/2010

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Term
Masking
Definition

Process by which representations of stimuli interact resulting in erasure.

(occurrence of new stimuli erases the mental or neural images of old stimuli.)

Term
SOA
Definition

Stimulus Onset Asynchrony:

Time in msec. between onset of a target and the onset of a mask.

Term
Backward Masking
Definition

Positive SOA:

masking where the mask occurs after presentation of a target therefore affecting the perception of the target

Term
Forward Masking
Definition

Negative SOA:

Mask occurs before the target

Term

Masking by Light

(Type A)

Definition
Masking found in contours when extended regions of light are used as a mask. Effect strong when both target and mask are shown to the same eye instead of presents to each eye separately.
Term

Masking by contour

(Type B)

Definition
Masking found with brightness rating or form identification. Brightness, contour detail and form are suppressed during this masking. But perception of the presence and location of target is not suppressed.
Term
Paracontrast
Definition
Forward masking by contour
Term
Metacontrast
Definition

Backward masking by contour.

 

(this is much more important than paracontrast)

Term

Luminance Summation Contrast Reduction Hypothesis

(Eriksen's theory explaining masking of light)

Definition

Sensory representation of target and mask combine, resulting in decrease in contrast and visibility of the target. Max of a type A function is when target and mask occur simultaneously (SOA= 0).

Predict by Michelson ratio:

(Lmax-Lmin) /( Lmax+Lmin)

Term
Masking by contour explained by neural interaction.
Definition

Werner suggests masking involved interruption of central contour forming mechanism.

Breitmeyer and Ganz Theory says:

presentation of visual stimulus results in quick response by magno cells followed by slower response of parvo cells.

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