Visual symmetry perception in early onset monocular blindness

Cattaneo, Zaira; Bona, Silvia; Monegato, Maura; Pece, Alfredo; Vecchi, Tomaso; Herbert, Andrew M.; Merabet, Lotfi B.

doi:10.1080/13506285.2014.938712

Cited by 7 publications

(5 citation statements)

References 42 publications

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“…Despite these changes to the visual system, slower processing time may not affect accuracy of visual behavior. The present data showing an increased response latency for visual stimuli compared to controls are consistent with data showing increased response latencies in people with one eye in a face perception and visual symmetry perception task in which they perform at the same level as controls but take significantly longer to do so (Cattaneo et al, 2014;.…”

Section: Slower Response Latencies For People With One Eyesupporting

confidence: 91%

Optimal Audiovisual Integration in People with One Eye

2014

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People with one eye show altered sensory processing. Such changes might reflect a central re-weighting of sensory information that might impact on how multisensory cues are integrated. We assessed whether people who lost an eye early in life differ from controls with respect to audiovisual integration. In order to quantify the relative weightings assigned to each sensory system, participants were asked to spatially localize audiovisual events that have been previously shown to be optimally combined and perceptually fused from the point of view of location in a normal population, where the auditory and visual components were spatially disparate. There was no difference in the variability of localizing unimodal visual and auditory targets by people with one eye compared to controls. People with one eye did however, demonstrate slower reaction times to localize visual stimuli compared to auditory stimuli and were slower than binocular and eye-patched control groups. When localizing bimodal targets, the weightings assigned to each sensory modality in both people with one eye and controls were predictable from their unimodal performance, in accordance with Maximum Likelihood Estimation and the time it took all three groups to localize the bimodal targets was faster than for vision alone. Regardless of demonstrating a longer response time to visual stimuli, people with one eye appear to integrate the auditory and visual components of multisensory events optimally when determining spatial location.

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Section: Slower Response Latencies For People With One Eyesupporting

confidence: 91%

Optimal Audiovisual Integration in People with One Eye

2014

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“…People who have had one eye removed early in life when the visual system is not yet mature demonstrate altered processing in their remaining senses. For example, they show intact ( Cattaneo, 2014 ) or enhanced visual spatial form ability ( Nicholas, Heywood, and Cowey 1996 , Reed et al, 1997 , Steeves et al, 2004 ), but reduced visual motion processing (see Steeves et al, 2008 ; Kelly et al, 2013 for reviews). Some evidence of cross-modal adaptation in response to the compromised enucleated visual system has also been demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Evidence of multisensory plasticity: Asymmetrical medial geniculate body in people with one eye

Moro

Kelly

McKetton

et al. 2015

NeuroImage: Clinical

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The medial geniculate body (MGB) plays a central role in auditory processing with both efferent and afferent tracts to primary auditory cortex. People who have lost one eye early in life have enhanced sound localization, lack visual over auditory dominance and integrate auditory and visual information optimally, similar to controls, despite taking longer to localize unimodal visual stimuli. Compared to controls, people with one eye have decreased lateral geniculate nuclei (LGN) volume as expected given the 50% deafferentation of the visual system. However, LGN volume is larger than predicted contralateral to the remaining eye, indicating altered structural development likely through recruitment of deafferented LGN cells.Purpose: the current study investigated whether structural MGB changes are also present in this group given the changes they exhibit in auditory processing.Methods: MGB volumes were measured in adults who had undergone early unilateral eye enucleation and were compared to binocularly intact controls.Results: unlike controls, people with one eye had a significant asymmetry with a larger left compared to right MGB, independent of eye of enucleation. MGB volume correlated positively with LGN volume in people with one eye.Conclusions: volume asymmetry in the MGB in people with one eye may represent increased interactions between the left MGB and primary auditory cortex. This interaction could contribute to increased auditory and other left hemisphere-dominant processing, including language, as compensation for the loss of one half of visual inputs early in life. The positive correlation between MGB and LGN volume is not due to space constraints but rather indicates increased plasticity in both auditory and visual sensory systems following early eye enucleation.

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“…A debated point in this context concerns the possibility that such a regularity is extracted automatically, or it calls attentional processes into play (see [3] for a review). In support of the first point of view, it has been shown that patients with hemispatial neglect ("blind" for the left visual field as a consequence of a right-hemispheric lesion) show a preference for symmetrical arrangements in both visual fields, confirming that preattentive processes are responsible for figure-ground organization [8][9][10]. Other important results in this context come from those patients who have undergone surgical resection of callosal fibers, in the attempt to avoid the spread of epileptic foci between the two cerebral hemispheres, the so called "split-brain patients" [11].…”

Section: Introductionmentioning

confidence: 56%

Asymmetry for Symmetry: Right-Hemispheric Superiority in Bi-Dimensional Symmetry Perception

Prete

Fabri

Foschi³

et al. 2017

Symmetry

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Abstract:A right-hemispheric superiority has been shown for spatial symmetry perception with mono-dimensional stimuli (e.g., bisected lines). Nevertheless, the cerebral imbalance for bi-dimensional stimuli is still controversial, and the aim of the present study is to investigate this issue. Healthy participants and a split-brain patient (D.D.C.) were tested in a divided visual field paradigm, in which a square shape was presented either in the left or right visual field and they were asked to judge whether a dot was placed exactly in the center of the square or off-center, by using the left/right hand in two separate sessions. The performance of healthy participants was better when the stimuli presented in the left visual field (LVF) were on-center rather than off-center. The performance of D.D.C. was higher than chance only when on-center stimuli were presented in the LVF in the left hand session. Only in this condition did his accuracy not differ with respect to that of the control group, whereas in all of the other conditions, it was lower than the controls' accuracy. We conclude that the right-hemispheric advantage already shown for mono-dimensional stimuli can be extended also to bi-dimensional configurations, confirming the right-hemispheric superiority for spatial symmetry perception.

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Visual symmetry perception in early onset monocular blindness

Cited by 7 publications

References 42 publications

Optimal Audiovisual Integration in People with One Eye

Optimal Audiovisual Integration in People with One Eye

Evidence of multisensory plasticity: Asymmetrical medial geniculate body in people with one eye

Asymmetry for Symmetry: Right-Hemispheric Superiority in Bi-Dimensional Symmetry Perception

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