Precise velocity discrimination despite random variations in temporal frequency and contrast

McKee, Suzanne P.; Silverman, Gerald; Nakayama, Ken

doi:10.1016/0042-6989(86)90009-x

Cited by 271 publications

(169 citation statements)

References 24 publications

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“…Which aspect of these signals dominates a visual percept depends largely on the velocity of the target. At intermediate velocities (for example, 10°/s), the velocity signal dominates other signals associated with moving targets, such as or position, contrast, and temporal frequency (Maunsell and van Essen, 1983;McKee et al, 1986;Chen et al, 1998). At slow velocities, on the other hand, position displacement becomes the dominant signal, and at high velocities, contrast or temporal frequency becomes dominant (McKee, 1981;McKee et al, 1986;Smith, 1987).…”

Section: Motion Processing In Schizophrenia and In Bipolar Disordermentioning

confidence: 99%

“…At intermediate velocities (for example, 10°/s), the velocity signal dominates other signals associated with moving targets, such as or position, contrast, and temporal frequency (Maunsell and van Essen, 1983;McKee et al, 1986;Chen et al, 1998). At slow velocities, on the other hand, position displacement becomes the dominant signal, and at high velocities, contrast or temporal frequency becomes dominant (McKee, 1981;McKee et al, 1986;Smith, 1987). Therefore, velocity discrimination in the intermediate range of velocities provides a more direct measure of the integrity of motion processing than performance in the slow and fast ranges of velocities, where multiple aspects of visual signals, including velocity and position or contrast, are involved.…”

Section: Motion Processing In Schizophrenia and In Bipolar Disordermentioning

confidence: 99%

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Bipolar and schizophrenic patients differ in patterns of visual motion discrimination

Chen

Levy

Sheremata

et al. 2006

Schizophrenia Research

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Background-Since Kraepelin's early distinction between bipolar disorder and schizophrenia, it has been assumed that these disorders represent two different pathophysiological processes, although they share many clinical symptoms. Previous studies showed that velocity discrimination, a sensitive psychophysiological measure of the visual motion system, is deficient in schizophrenia. Here we examined whether the motion processing impairment found in schizophrenia also occurs in bipolar disorder.

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Section: Motion Processing In Schizophrenia and In Bipolar Disordermentioning

confidence: 99%

Section: Motion Processing In Schizophrenia and In Bipolar Disordermentioning

confidence: 99%

Bipolar and schizophrenic patients differ in patterns of visual motion discrimination

Chen

Levy

Sheremata

et al. 2006

Schizophrenia Research

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“…The visual cues that influence velocity discrimination vary as a function of target velocity (McKee et al, 1986;Chen et al, 1998). At slow velocities (e.g.…”

Section: Introductionmentioning

confidence: 99%

Aging and visual motion discrimination in normal adults and schizophrenia patients

Bidwell

Holzman

Chen

2006

Psychiatry Research

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Motion perception is impaired in many neuropathological conditions, including schizophrenia. Motion perception also declines in the course of normal aging. In this study, we ask whether aging is an additive factor in the motion-discrimination deficits of schizophrenia patients. We examined motion perception in schizophrenia patients (n =44) and non-psychiatric controls (n =40) whose ages ranged from 18 to 55. The tasks included velocity discrimination and contrast detection. Thresholds for each of the two tasks were determined for each subject using psychophysical methods. Schizophrenia patients showed significantly increased thresholds (degraded performance) for velocity discrimination compared with the controls. Degraded performance in patients was not related to age. In controls, however, velocity discrimination thresholds were significantly increased beginning by age 45. Performance on a contrast-detection task, which does not require precise discrimination of motion signals, was not significantly affected by age in either group. Aging, even in its early stages, degrades motion discrimination in normal adults. Aging, however, does not adversely affect motion-discrimination deficits in schizophrenia patients through age 55. A similar motion-discrimination deficit in schizophrenia patients and aging normal adults suggests that the mechanisms underlying motion processing in schizophrenia and normal aging may be associated.

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“…The question of how to combine information from many such local measures into a consistent object velocity signal has drawn considerable attention in the last decade, both within the computer vision community (reviewed in Uras et al, 1988) and within the psychological and physiological investigation of biological vision (Adelson & Movshon, 1982;Derrington & Suero, 1991;Ferrera & Wilson, 1987, !990, 1991McKee, Silverman, and Nakayama, 1986;Movshon, et al, 1985;Welch, 1989).…”

Section: Introductionmentioning

confidence: 99%

The perception of globally coherent motion

Mingolla¹,

1992

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Precise velocity discrimination despite random variations in temporal frequency and contrast

Cited by 271 publications

References 24 publications

Bipolar and schizophrenic patients differ in patterns of visual motion discrimination

Bipolar and schizophrenic patients differ in patterns of visual motion discrimination

Aging and visual motion discrimination in normal adults and schizophrenia patients

The perception of globally coherent motion

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