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Results for “FIGURAL AFTEREFFECT”

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PubMed1981

Evidence for parallel processing in motion perception.

It is proposed that motion perception is mediated within two parallel channels in the visual system. These channels are distinguished by the following properties: rate of recovery from adaptation; degree of fine tuning for contour orientation; inclusion of color sensitive units; and ocular dominance characteristics. Three experiments are reported which test the hypothesized systems.

Color Perception↗
PubMed1994

Visible persistence decay rates for schizophrenics and substance abusers.

Information-processing deficits are consistently reported for schizophrenics. The findings from the majority of psychophysical tasks indicate that the deficit is specific to schizophrenics and thus may represent a marker for schizophrenia. The present study evaluated for specificity of impairment by including controls using methadone. A two-pulsed forced choice information-processing task that required the detection of a line or a blank-field during an interstimulus interval (ISI) indexed efficiency of processing (i.e., visible persistence). There were 19 schizophrenic, 9 schizoaffective, 8 depressed, 12 on methadone, and 12 normal subjects. The visual stimuli were low and high spatial frequency gratings. Either a line of equivalent width to those of the gratings or a blank field was presented during the ISI. The gratings were presented for 150 msec prior to and following an ISI of 30, 60, 90, 120, 150, and 350 msec. The results support previous findings for impaired processing during a 90-150 msec interval for schizophrenics. Also, the methadone-using controls were not significantly different from schizophrenics. Normal and depressed controls' profiles did not differ from each other, however, they were significantly different from the other groups. The results support an early information-processing deficit in schizophrenic individuals and may implicate dysregulation of dopaminergic neuromodulation.

Adult↗
PubMed1989

The phenomenology of spatial integration: data and models.

A briefly presented visual stimulus followed by darkness seems to persist beyond its physical offset. We are concerned here with the relation between two characteristics of this visible persistence: first, its phenomenological resemblance to the stimulus that spawned it and second, its usefulness as a basis for integrating visual stimuli that are separated in time. We describe two experiments using a task in which two halves of a visual stimulus were presented successively and observers reported how complete the stimulus appeared to be. Stimuli appeared less complete with increases in both the duration of the interval intervening between presentation of the two halves and the duration of the initially presented stimulus half. This data pattern is similar to that obtained in tasks in which spatial integration of two temporally disparate stimuli is necessary for correct responding. On the basis of this similarity, we argue that phenomenological appearance and ability to integrate stimuli over time are two facets of the same perceptual events. We describe a formal model to account for these and other data.

Adult↗