Is the anisotropy of perceived 3-D shape invariant across scale?
Jack M. Loomis,John W. Philbeck +1 more
TL;DR: This experiment examined whether this 3-D perceptual anisotropy, whereby spatial intervals oriented in depth are perceived to be smaller than physically equal intervals in the frontoparallel plane, is scale invariant, and indicated it is invariant across these two scales.
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Abstract: A number of studies have resulted in the finding of a 3-D perceptual anisotropy, whereby spatial intervals oriented in depth are perceived to be smaller than physically equal intervals in the frontoparallel plane. In this experiment, we examined whether this anisotropy is scale invariant. The stimuli were L shapes created by two rods placed flat on a level grassy field, with one rod defining a frontoparallel interval, and the other, a depth interval. Observers monocularly and binocularly viewed L shapes at two scales such that they were projectively equivalent under monocular viewing. Observers judged the aspect ratio (depth/width) of each shape. Judged aspect ratio indicated a perceptual anisotropy that was invariant with scale for monocular viewing, but not for binocular viewing. When perspective is kept constant, monocular viewing results in perceptual anisotropy that is invariant across these two scales and presumably across still larger scales. This scale invariance indicates that the perception of shape under these conditions is determined independently of the perception of size.
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The Perception of the Visual World. By James J. Gibson. U.S.A.: Houghton Mifflin Company, 1950 (George Allen & Unwin, Ltd., London). Price 35s.
TL;DR: In this paper, the authors offer a new book that enPDFd the perception of the visual world to read, which they call "Let's Read". But they do not discuss how to read it.
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Inactivation of hCDC4 can cause chromosomal instability
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TL;DR: The identification of mutations in hCDC4 (also known as Fbw7 or Archipelago) in both human colorectal cancers and their precursor lesions is reported and suggests that chromosomal instability is caused by specific genetic alterations in a large fraction of human cancers and can occur before malignant conversion.
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Factor structure of the Perceived Stress Scale (PSS) in a sample from Mexico.
TL;DR: Internal consistency was adequate and confirmatory factor analysis corroborated the factor structure of the Spanish version of the Perceived Stress Scale and the goodness-of-fit measures also revealed an adequate fit.
Perceiving distance accurately by a directional process of integrating ground information.
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References
The Perception of the Visual World. By James J. Gibson. U.S.A.: Houghton Mifflin Company, 1950 (George Allen & Unwin, Ltd., London). Price 35s.
TL;DR: In this paper, the authors offer a new book that enPDFd the perception of the visual world to read, which they call "Let's Read". But they do not discuss how to read it.
2.2K
Perceiving Layout and Knowing Distances: The Integration, Relative Potency, and Contextual Use of Different Information about Depth*
James E. Cutting,Peter M. Vishton +1 more
- 01 Jan 1995
TL;DR: This chapter discusses three questions and suggests that list making has misled about space and layout and can begin to understand how those sources of information sharing the same-shaped functions across distances can help ramify judgments of layout by serving to correct measurement errors in each.
Visual space perception and visually directed action.
TL;DR: The results of two types of experiments are reported in this article, showing that the distortion in the mapping from physical to visual space evident in the visual matching task does not manifest itself in the visually open-loop motoric tasks.
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Stability and constancy in visual perception : mechanisms and processes
William Epstein
- 01 Jan 1977
TL;DR: In this article, the authors discuss the stability and constancy in visual perception mechanisms and processes wiley series in behavior and the best experience and lesson to take, not only take, but also learn.
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