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Results for “Perceptual Distortion”

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At least 325 records · Page 18Linked to original sources
PubMed1992

Depressed mothers as informants about their children: a critical review of the evidence for distortion.

The claim that depressed mothers have distorted, inflated, perceptions of their children's problems has been made with increasing frequency in recent years. This review explicates the significance of the depression-->distortion controversy, introduces a set of standards for evaluating distortion claims, and uses these standards to evaluate the key characteristics of 22 studies that have published data directly relevant to the distortion question. None of the studies that claimed evidence for a depression-->distortion influence on mothers' ratings of their children met the necessary and sufficient criteria for establishing distortion. This review challenges the empirical foundation for the widely held assumption that depressed mothers have distorted perceptions of their children's problems. Issues that will require reckoning in future efforts to explore the depression-->distortion question are considered.

Child↗
PubMed1999

Some recent studies on the extraretinal contribution to distance perception.

Some recent studies on the extraretinal contribution to distance perception are reviewed. These experiments demonstrate that vergence can provide reliable information for judgments on the distance of proximal targets in the absence of all other cues. We argue that, although vergence is an unreliable cue at large fixation distances and is subject to a strong contraction bias when studied in isolation, these facts do not imply a minor role for vergence in near-space perception. When additional depth and distance cues are added, the contribution of vergence information becomes more complicated. We present results which indicate that the different cues to depth and distance are combined in a manner that can result in unexpected distortions of visual space. A simple heuristic model which can produce the observed distortions is outlined.

Accommodation, Ocular↗
PubMed1986

Relative size and spatial separation: effects on the parallel-lines illusion.

The parallel-lines illusion provides a prototypical example of visual-size assimilation, where the size of a test element is phenomenally skewed towards (or "averaged with") that of a context element. Most assimilation theories predict that distortion should decrease with spatial separation between context and test lengths. However, there is some disagreement about the nature of the function relating sizes of context and test elements and magnitude of assimilation. The present study tests the limits of assimilation in the parallel-lines configurations by observing the effects of a wide range of context/test size ratios, repeated over two disparate levels of spatial separation. The results replicate and extend 1979 findings by Brigell and Uhlarik, confirming that assimilation rises to a peak at midrange size ratios, only to decrease continuously as the ratios become more extreme. The functions were nonmonotonic and similar in shape for both levels of spatial separation, with an over-all decrease in distortion for configurations with the larger separation.

Adolescent↗
PubMed1988

Distorted body image in bulimic women.

Fifteen bulimic women (DSM III) and 15 women with no indication of an eating disorder, matched pairwise with respect to age, weight and height, were assessed via a distorting video image technique under four conditions. They were asked to: (1) estimate the width of a water bottle, (2) estimate the width of their own body, (3) repeat those estimates under a condition of reward for high accuracy, (4) focus attention on their bodily sensations and indicate how wide their body felt. While groups did not differ in their estimates under condition 1 (water bottle), significant differences were found between groups under conditions 2, 3 and 4 (own body), the percentage of overestimating being highest when subjects were to indicate how wide their body felt. Results suggest that modalities of perception other than visual are strongly involved in the body image distortion of bulimics.

Adult↗