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Results for “Distance Perception”

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At least 289 records · Page 16Linked to original sources
PubMed1999

The size-distance paradox is a cognitive phenomenon.

The perceived size of a fixated object is known to be a function of the perceived fixation distance. The size-distance paradox has been posited as evidence that the perceived distance of a fixated object is, in turn, influenced by the object's perceived size. If this is correct then it challenges a widely accepted account (modified weak fusion) of how the nervous system combines multiple sources of information. We hypothesised that the influence of perceived size on the perception of distance is likely to be restricted to conscious perceptual judgements. If our hypothesis is correct then the size-distance paradox should not be observed when observers make action-based distance judgements. In line with this expectation we observed the size-distance paradox when participants made verbal reports on target distance but found no paradoxical judgements in a group who were asked to point at the target. We therefore suggest that the size-distance paradox should not be taken as evidence that perceived size feeds back into distance perception.

Adult↗
PubMed1978

Effect of perspective and slant on perception of apparent size and distance.

An experiement was performed to re-examine the role of linear perspective and floor slant on apparent size and distance scales. Misleading perspective cues did not alter the observers' apparent distance scales but did influence the absolute magnitude of distance judgments; floor slant exerted little influence on apparent distance scales or the absolute magnitude of distance judgments. Neither perspective nor slant manipulation reliably affected apparent size scales or exerted more than a minor influence on the absolute magnitude of size judgments.

Cues↗
PubMed2000

Perceiving binocular depth with reference to a common surface.

A common surface is a spatial regularity of our terrestrial environment. For instance, we walk on the common ground surface, lay a variety of objects on the table top, and display our favorite paintings on the wall. It has been proposed that the visual system utilizes this regularity as a reference frame for coding objects' distances. Presumably, by treating the common surface as such--i.e. an anticipated constant--the visual system can reduce its coding redundancy, and divert its resources to representing other information. For intermediate-distance space perception, it has been found that absolute distance judgment is most accurate when a common ground surface is available. Here we explored if the common surface also serves as the reference frame for the processing of binocular-disparity information, which is a predominant cue for near-distance space perception. We capitalized on an established observation where the perceived slant of a surface with linear binocular-disparity gradient is underestimated. Clearly, if the visual system utilizes this incorrectly represented slant surface as a reference frame for coding the objects' locations, the perceived depth separation between the objects will be adversely affected. Our results confirm this, by showing that the depth judgment of objects (two laterally separated vertical lines) on, or in the vicinity of, the surface is underestimated. Furthermore, we show that the impact of the common surface on perceived depth separation most likely occurs at the surface-representation level where the visual surface has been explicitly delineated, rather than at the earlier disparity-processing level.

Cues↗
PubMed2005

Bicultural identity integration (BII): components and psychosocial antecedents.

The present study examines the underresearched topic of bicultural identity; specifically, we: (1) unpack the construct of Bicultural Identity Integration (BII), or the degree to which a bicultural individual perceives his/her two cultural identities as "compatible" versus "oppositional," and (2) identify the personality (Big Five) and acculturation (acculturation stress, acculturation attitudes, bicultural competence) predictors of BII. Differences in BII, acculturation stress, and bicultural competence were measured with new instruments developed for the purposes of the study. Using a sample of Chinese American biculturals, we found that variations in BII do not define a uniform phenomenon, as commonly implied in the literature, but instead encompass two separate independent constructs: perceptions of distance (vs. overlap) and perceptions of conflict (vs. harmony) between one's two cultural identities or orientations. Results also indicated that cultural conflict and cultural distance have distinct personality, acculturation, and sociodemographic antecedents.

Acculturation↗
PubMed2006

Distorting visual space with sound.

Attentional repulsion is described as the perceived displacement of a vernier stimulus in a direction that is opposite to a brief peripheral visual cue (Suzuki & Cavanagh, 1997). Here, we demonstrate that visual repulsion can also be elicited using lateralized sounds. Given that repulsion is believed to be occurring in early retinotopic visual areas, these results raise the possibility that the location of a sound could directly influence the pattern of activity as early as primary visual cortex.

Acoustic Stimulation↗
PubMed1977

The moon illusion: a test of the vestibular hypothesis under monocular viewing conditions.

The results of earlier monocular experiments on the moon illusion have been either negative or confounded. To test the role of vestibular function, 24 subjects made forced-choice distance comparisons between stimuli mounted in translucent tubes. The stimulus tube for standard distance could be positioned in three viewing angles (45 degrees up, horizontal, and 45 degrees down). A comparison tube adjustable for distance was mounted horizontally. There was a greater perception of depth in the downward looking condition. The relatively weak effects are discussed in terms of a two-hypothesis explanation of the real-life moon illusion and the poor cues for depth perception in monocular viewing.

Astronomical Phenomena↗