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Results for “Space Perception”

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At least 847 records · Page 47Linked to original sources

PubMed2003

[Effects of field viewing angles on object judgement [correction of jubgerent] in virtual environment].

OBJECT: To investigate the effect of viewing angle on human judgement reliability for objects in virtual environment. METHOD: Firstly, pre-tests were done with the PC virtual reality ergonomic system to determine difference among observed object and values of viewing angle. Then, one factor, 4-levels full random experiments were done with 45 health human subjects (male and female nearly 1:1). RESULT: It was shown that the reliability of human judgement was significantly influenced by the setting of the viewing angle of virtual environment, and the object judgement including size and angle judgement was the best when the viewing angle of virtual environment was 60 degrees. CONCLUSION: When virtual reality was used in ergonomic design, operation training and other related research, the effect of field viewing angle should be taken into consideration, and 60 degrees is recommended to be optimal for human judgment task.

Adult↗

PubMed2003

[Effect of striate visual cortex topography on the parameters of image filtering].

A model of spatial-frequency filtering at the level of 4C layer of the striate visual cortex is proposed and based on the well-known literature data. The evidence on conformable character of representation of the visual field on the primary visual cortex and the suggestions concerning uniformity of horizontal connections of cortical neurones serve as the ground of the model. A correspondence between predictions of the model and results of the experiments with shape perception and size discrimination has been obtained.

Animals↗

PubMed2003

[Problem of visual segmentation and spatial-frequency filtration].

The analysis of the visual segmentation problem involved questions concerned with a signal description as a result of linear filtering, nature following nonlinear transformations, and possible role of a spatial attention in pooling. Different approaches to the visual segmentation problem are compared. Our data suggest a model of visual segmentation. It uses the universal principle of linear filters pooling at second-order mechanisms. The pooling mechanism is characterized by position, spatial frequency and orientation tuning an is selective in respect to pattern size. The most activated pooling mechanisms are "targets" for selective attention. It is shown that the information selected this way is necessary and sufficient for recognition. Multiple representation of a visual scene with different resolution and hierarchical principle of description organise the recognition as successive specification.

Attention↗

PubMed1989

Do artificial limbs become part of the user? New evidence.

This paper provides evidence that limb-deficient subjects who wear artificial arms tend to overestimate the perceived length of their residual limb. It is proposed that this "perceptual error" may provide a useful and possibly more valid alternative to existing methods of determining prosthetic acceptance. The degree of overestimation is substantial for most subjects with amputations, and typically represents 20 percent of the length of the prosthetic arm. The effect is considerably reduced when the prosthetic limb is removed. Comparisons are made with normal-limbed subjects of various ages. For the most part, their errors are small and typically are underestimates of actual limb length. This research is compared with the work of Fraser (1984), who found similarities in reaching trajectories for normal and artificial arms. Further investigation is required to determine if this effect may serve as an index of adjustment to a prosthesis and, additionally, if prosthetics training programs might benefit from including techniques for enhancing perceptual adaptations to artificial limbs.

Adaptation, Psychological↗

PubMed1986

[Antenatal prevention, using lithium oxybutyrate, of changes in the development of the rat brain caused by serum from schizophrenic patients].

It has been found that antenatal administration of schizophrenic patients' sera to rats has neuroembryotoxic effect on their progeny, decreasing the number of females in the brood, disturbing motor coordination and space perception in young male rats, slightly stimulating muscular force and motor activity, altering lateralization of the behaviour. Antenatal lithium hydroxybutyrate was shown to prevent some of the serum effects.

Adult↗

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