Coherent global motion percepts from stochastic local motions
Douglas W. Williams,Robert Sekuler +1 more
- 01 Jan 1986
- pp 105-106
450
TL;DR: This work studied the percept with dynamic random dot kinematograms whose elements took independent, random walks of constant step size; their directions of displacement were drawn from a uniform distribution.
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Abstract: A percept of global, coherent motion results when many different localized motion vectors are combined. We studied the percept with dynamic random dot kinematograms whose elements took independent, random walks of constant step size; their directions of displacement were drawn from a uniform distribution. The tendency to see global, coherent flow along the mean of the uniform distribution varied with the range of the distribution. Psychometric functions were obtained with kinematograms having various step sizes and element densities. The changes in the psychometric function with step size and density are consistent with Ullman's "minimal map theory" of motion correspondence.
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Citations
The Pervasiveness of Ensemble Perception
Jennifer E. Corbett,Igor Utochkin,Shaul Hochstein +2 more
- 13 Jan 2023
TL;DR: The recent understanding of ensemble representations in perception in a holistic way aimed to engage the general audience, novel and expert alike, has been outlined in this article , where the authors highlight the ubiquitous nature of this summary process, paving the way for a discussion of the theoretical and cortical underpinnings, and why ensemble encoding should be considered a basic, inherently necessary component of human perception.
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A transient deficit of motion perception in human
TL;DR: The nature and quick recovery of the deficits in SF resembles the transient motion perception deficit observed in monkey following ibotenic acid lesions, and provides additional evidence that humans possess specialized cortical areas subserving similar motion perception functions.
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No interaction of first- and second-order signals in the extraction of global-motion and optic-flow
TL;DR: Results show no cross-masking of FO and SO signals, thus supporting the hypothesis of independent first-order and second-order motion systems up to and including the level extracting optic-flow.
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Neural Computations Governing Spatiotemporal Pooling of Visual Motion Signals in Humans
TL;DR: This work examined the contribution of different computations to human observers' performance on two global visual motion discriminations tasks, one requiring the combination of motion directions over time and another requiring their combination in different relative proportions over space and time.
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Global motion adaptation.
TL;DR: It is found that following adaptation to this stimulus, judgements of the perceived direction of a test pattern are systematically biased towards the direction opposite to the adapting direction, suggesting that adaptation does occur at a level of visual processing at which global motion is represented.
18
References
•Book
The Interpretation of Visual Motion
Shimon Ullman
- 01 Jan 1979
TL;DR: In this paper, the authors used the methodology of artificial intelligence to investigate the phenomena of visual motion perception: how the visual system constructs descriptions of the environment in terms of objects, their three-dimensional shape, and their motion through space, on the basis of the changing image that reaches the eye.
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Phenomenal coherence of moving visual patterns
TL;DR: It is reported here that coherence depends on the relative contrasts, spatial frequencies and directions of motion of the gratings, and these effects may reveal the previously unstudied properties of a higher order stage of motion analysis.
A short-range process in apparent motion
TL;DR: Perceptual segregation in an alternated pair of random-dot patterns was perceived as a segregated, coherently moving shape only if the displacement was small, while classical apparent motion with larger displacements involves a different process.
905
Rapid measurement of contrast-sensitivity functions.
Robert Sekuler,Paul Tynan +1 more
TL;DR: This rapid procedure, which resembles that used in the Bekesy sweep-frequency audiometer, has potential as a clinical tool for diagnostic assessment.
37
•Journal Article
Phenomenal coherence of moving gratings (A)
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