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Results for “Perceptual Masking”

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At least 109 records · Page 6Linked to original sources
PubMed2001

Contextual modulation of orientation discrimination is independent of stimulus processing time.

Contextual inhibition of neural activity in the primary visual cortex begins immediately and is most pronounced in the early transient response component. Using backward masking to control available processing time, we investigated whether the interaction between perceptual contextual modulation and processing time reflects the neural dynamics of contextual inhibition. We found that the threshold elevation due to contextual inhibition in an orientation-discrimination task is essentially independent of the available processing time and that it is closely related to contextual inhibition of the early transient response component of orientation-selective neurons in the primary visual cortex.

Discrimination, Psychological↗
PubMed1999

Backward masking in bipolar affective disorder.

1. When an informational stimulus, the target, is followed closely in time by a non-informational stimulus, the mask, the visual system's processing of the informational stimulus is disturbed. This disturbance is known as backward visual masking. 2. Transient and sustained visual pathways detect different characteristics of a visual stimulus, at different times in early visual information processing, and have unique anatomic distribution with regard to retinal origin, thalamic and cortical projections. 3. Backward masking occurs by two mechanisms. Interruption occurs when activity in the transient channels of the mask disrupt activity in the sustained channels of the target. Integration occurs when activity in the sustained channels of the mask disrupt activity of the sustained channels of the target. 4. Characteristics of the mask--energy, location, or the time presented after the target--can be altered to enhance interruption or integration. Interruption is a bell-shaped function of, and integration is an exponential function of, visual performance and interstimulus interval. 5. An impairment in backward masking is present in bipolar subjects during manic episodes, is not related to the presence of psychotic symptoms, and persists when mania resolves. Lithium appears to have a detrimental effect on backward masking.

Bipolar Disorder↗
PubMed2006

Auditory masking: need for improved conceptual structure.

Even in simpler times, some people (e.g., Tanner) found it useful to ask "What is masking?" Independent of the extent to which this question was adequately answered even in those times, it is clear that the current expanded interest in central auditory processing has raised this question anew. In this note, comments are made about masking-related issues that illustrate the kinds of questions that need to be considered in attempting to develop a conceptual structure that can be effectively used to define, classify, study, and model auditory masking.

Acoustic Stimulation↗
PubMed1975

Serial processing shown by mutual masking of icons.

In a procedure called mutual masking, two compound words were tachistoscopically exposed successively at the same location. Perceptual accuracy for both words was examined. With fixation at the center of the arrays, Ss often identified the component at the left within the temporally first word and at the right within the second. These results imply a left-to-right serial processing. With fixation on begining or end component, Ss tended to identify the component away from fixation of the first word and the fixated part of the second. This implies scanning from periphery toward fixation. Therefore, sequential processing of iconic information was obtained, with direction of processing determined by specific conditions.

Adolescent↗
PubMed1976

Potential artifact in dichoptic backward masking.

Under some conditions a dark interval in the target eye may be concomitant with presentation of a dichoptic mask. Results show that this monoptic dark interval contributes to the over-all observed dichoptic masking effect.

Differential Threshold↗