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Related Experiment Videos

Interruption of dot processing by a backward mask.

P Liss, A Reeves

    Perception
    |January 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Backward masking interrupts visual perception, as shown by dot counting experiments. Contrast reduction, however, integrates visual information rather than interrupting it.

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    Area of Science:

    • Cognitive psychology
    • Visual perception

    Background:

    • Backward masking is a phenomenon where a visual stimulus is rendered invisible by a subsequent stimulus.
    • Understanding the mechanisms of visual masking is crucial for comprehending visual processing limitations.

    Purpose of the Study:

    • To investigate the mechanisms underlying backward masking by pattern.
    • To differentiate between interruption and integration models of visual masking.
    • To examine the effect of stimulus contrast on visual masking.

    Main Methods:

    • Presenting a target field of black dots for 20 ms, followed by a patterned mask for 200 ms.
    • Varying stimulus onset asynchrony (SOA) between target and mask.
    • Testing different criteria (strict or lax) for reporting target numerosity.

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  • Degrading target contrast without using a mask.

    • Main Results:

    • Numerosity functions and discrimination data supported an interruption model for pattern masking, even at short SOAs (50 ms).
    • When targets were degraded by contrast reduction instead of masking, results supported an integration model.
    • The findings suggest distinct mechanisms for pattern masking and contrast degradation.

    Conclusions:

    • Backward masking by pattern operates via an interruption mechanism.
    • Contrast reduction in visual stimuli leads to integration rather than interruption.
    • Visual masking mechanisms are dependent on the specific stimulus manipulation employed.