Objects look different sizes in the right and left eyes

McManus, IC; Tomlinson, Julia

doi:10.1080/13576500342000077a

Cited by 9 publications

(5 citation statements)

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“…Certainly this hypothesis concurs with demonstrations that neglect patients with right hemisphere damage consistently show strong asymmetries in the opposite direction. Moreover, research has recently shown that right-handed participants judged stimuli that were presented to the left eye as being larger than those presented to the right eye, regardless of position within hemispace (McManus & Tomlinson, 2004). Although the theoretical locus of this finding is unclear, the authors propose that it is possible that there are receptor differences between the two eyes, therefore, the effect may be similar to the attentional bias in stimulus judgment brought about through right-hemispheral dominance.…”

mentioning

confidence: 97%

Hemispatial asymmetries in judgment of stimulus size

Charles

Sahraie

McGeorge

2007

Perception & Psychophysics

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Recent research has demonstrated a leftward bias in judgments of size. In the present experiments, hemispatial size bias was measured through simultaneous presentation of a circle and an ellipse varying in horizontal or vertical extent. A consistent leftward bias of horizontal size judgments (but not vertical) was obtained; at the point of subjective equality, the width of the objects that were presented in left hemispace was smaller than the width of the objects that were presented in right hemispace. These data suggest that the horizontal extent of stimuli appear larger in left hemispace than in right hemispace. Results also indicated that symmetrical stimulus presentation, with respect to the vertical meridian, is required for the bias to emerge. Furthermore, increasing or decreasing stimulus eccentricity weakened the effect. Attenuation of this bias upon the manipulation of parameters indicates that this phenomenon is context specific and is affected by similar parameters that are known to influence the magnitude of error in pseudoneglect.

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mentioning

confidence: 97%

Hemispatial asymmetries in judgment of stimulus size

Charles

Sahraie

McGeorge

2007

Perception & Psychophysics

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“…For example, the human right hemisphere is usually dominant for spatial processing, and this determines left -right perceptual and attentional biases, a phenomenon known as 'pseudoneglect'. Simple tests show that more attention is paid to the left side of a happy -sad chimeric face (David 1989), that a systematic leftward error is made in the manual bisection of a line ( Jewell & McCourt 2000) or that objects appear to have significantly different size when seen by the right and the left eye (McManus & Tomlinson 2004).…”

Section: Introductionmentioning

confidence: 99%

The costs of hemispheric specialization in a fish

et al. 2009

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Laboratory and field studies have documented better cognitive performance associated with marked hemispheric specialization in organisms as diverse as chimpanzees, domestic chicks and topminnows. While providing an evolutionary explanation for the emergence of cerebral lateralization, this evidence represents a paradox because a large proportion of non-lateralized (NL) individuals is commonly observed in animal populations. Hemispheric specialization often determines large left -right differences in perceiving and responding to stimuli. Using topminnows selected for a high or low degree of lateralization, we tested the hypothesis that individuals with greater functional asymmetry pay a higher performance cost in situations requiring matching information from the two eyes. When trained to use the middle door in a row of a nine, NL fish correctly chose the central door in most cases, while lateralized fish showed systematic leftward or rightward biases. When choosing between two shoals, each seen with a different eye, NL fish chose the high-quality shoal significantly more often than the lateralized fish, whose performance was affected by eye preference for analysing social stimuli. These findings suggest the existence of a trade-off between computational advantages of hemispheric specialization and the ecological cost of making suboptimal decisions whenever relevant information is located on both sides of the body.

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“…Interestingly, the majority of the adult population demonstrates a very slight head-tilt with about 67% having the left eye higher and 33% the right eye higher [38]. However, it is not possible to assess the exact impact of these minor degrees of asymmetry on handedness in healthy populations based on the present dataset.…”

Section: Discussionmentioning

confidence: 85%

“…Torticollis-children exhibit a permanently fixed headposture, whereas in the overall population a clear head-turning preferences are only evident in specific situations, such as if an infant is brought into a supine position or during kissing. Also, it is not known how often and how long normal adult exhibit the asymmetries in eye height reported by McManus and Tomlinson [38] in everyday life. This probably results in stronger asymmetries in visual experience of the hand in torticollis-children than in the overall population.…”

Section: Discussionmentioning

confidence: 96%

Visual experience affects handedness

Ocklenburg

Bürger

Westermann

et al. 2010

Behavioural Brain Research

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a b s t r a c tIn birds, a lateralised visual input during early development importantly modulates morphological and functional asymmetries of vision. We tested the hypothesis that human handedness similarly results from a combination of inborn and experience-driven factors by analysing sidedness in children suffering from congenital muscular torticollis. These children display a permanently tilted asymmetric head posture to the left or to the right in combination with a contralateral rotation of face and chin, which could lead to an increased visual experience of the hand contralateral to the head-tilt. Relative to controls, torticollischildren had a higher probability of right-or left-handedness when having a head-tilt to the opposite side. No statistical significant relation between head position and direction of functional asymmetries was found for footedness and eye-preference, although the means show a non-significant trend in the same direction as was observed for handedness. Thus, an increased visual control of the hand during early childhood seems to modulate handedness and possibly other lateral preferences to a lesser extent. These findings not only show that human handedness is affected by early lateralised visual experience but also speak in favour of a combined gene-environment model for its development.

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Objects look different sizes in the right and left eyes

Cited by 9 publications

References 0 publications

Hemispatial asymmetries in judgment of stimulus size

Hemispatial asymmetries in judgment of stimulus size

The costs of hemispheric specialization in a fish

Visual experience affects handedness

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