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Common-onset masking simulated with a distributed-code model.

Bridgeman B - Adv Cogn Psychol (2008)

Bottom Line: A distributed-coding model incorporating lateral inhibition in a simulated nerve network has been successful in accounting for many properties of backward masking (Bridgeman, 1971, 1978), linking modeling with neurophysiology and psychophysics.Metacontrast is a variety of backward masking that is of particular interest in uncovering properties of visual coding because target and mask do not overlap in time or space, and it is the first stimulus that is reduced in visibility, not the second.The lateral inhibitory model can also simulate common-onset masking, where a target and mask appear simultaneously but the mask disappears after a variable delay, and it can reproduce qualitatively the effects of attention on object substitution by varying the time interval over which sensory codes are analyzed.

View Article: PubMed Central - PubMed

Affiliation: Department of Psychology, University of California, Santa Cruz, Ca. USA.

ABSTRACT
A distributed-coding model incorporating lateral inhibition in a simulated nerve network has been successful in accounting for many properties of backward masking (Bridgeman, 1971, 1978), linking modeling with neurophysiology and psychophysics. Metacontrast is a variety of backward masking that is of particular interest in uncovering properties of visual coding because target and mask do not overlap in time or space, and it is the first stimulus that is reduced in visibility, not the second. The lateral inhibitory model can also simulate common-onset masking, where a target and mask appear simultaneously but the mask disappears after a variable delay, and it can reproduce qualitatively the effects of attention on object substitution by varying the time interval over which sensory codes are analyzed.

No MeSH data available.


Paradigm for common-offset masking, showing the longest and shortest							masks simulated.
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Figure 4: Paradigm for common-offset masking, showing the longest and shortest masks simulated.

Mentions: This psychophysical finding can also test the lateral inhibitory model. To simulate simultaneous-offset masking, the parameters of the Francis (2003) instantiation of the lateral inhibitory model were modified to allow the mask to begin before the target (figure 4). A target was always presented for one iteration. The mask terminated along with the target, but it began either at the same time or at 30, 60 or 90msec before the target.


Common-onset masking simulated with a distributed-code model.

Bridgeman B - Adv Cogn Psychol (2008)

Paradigm for common-offset masking, showing the longest and shortest							masks simulated.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2864978&req=5

Figure 4: Paradigm for common-offset masking, showing the longest and shortest masks simulated.
Mentions: This psychophysical finding can also test the lateral inhibitory model. To simulate simultaneous-offset masking, the parameters of the Francis (2003) instantiation of the lateral inhibitory model were modified to allow the mask to begin before the target (figure 4). A target was always presented for one iteration. The mask terminated along with the target, but it began either at the same time or at 30, 60 or 90msec before the target.

Bottom Line: A distributed-coding model incorporating lateral inhibition in a simulated nerve network has been successful in accounting for many properties of backward masking (Bridgeman, 1971, 1978), linking modeling with neurophysiology and psychophysics.Metacontrast is a variety of backward masking that is of particular interest in uncovering properties of visual coding because target and mask do not overlap in time or space, and it is the first stimulus that is reduced in visibility, not the second.The lateral inhibitory model can also simulate common-onset masking, where a target and mask appear simultaneously but the mask disappears after a variable delay, and it can reproduce qualitatively the effects of attention on object substitution by varying the time interval over which sensory codes are analyzed.

View Article: PubMed Central - PubMed

Affiliation: Department of Psychology, University of California, Santa Cruz, Ca. USA.

ABSTRACT
A distributed-coding model incorporating lateral inhibition in a simulated nerve network has been successful in accounting for many properties of backward masking (Bridgeman, 1971, 1978), linking modeling with neurophysiology and psychophysics. Metacontrast is a variety of backward masking that is of particular interest in uncovering properties of visual coding because target and mask do not overlap in time or space, and it is the first stimulus that is reduced in visibility, not the second. The lateral inhibitory model can also simulate common-onset masking, where a target and mask appear simultaneously but the mask disappears after a variable delay, and it can reproduce qualitatively the effects of attention on object substitution by varying the time interval over which sensory codes are analyzed.

No MeSH data available.