The what and why of perceptual asymmetries in the visual domain.
A. Karim,Haruyuki Kojima +1 more
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TLDR
These asymmetries have inborn neural/physiological origins, but can be also susceptible to visual experience, the critical why, and are explained in terms of perceptual aspects or tasks, the what of the asymmetry; and in terms, the why of the underlying mechanisms.Abstract:
Perceptual asymmetry is one of the most important characteristics of our visual functioning. We carefully reviewed the scientific literature in order to examine such asymmetries, separating them into two major categories: within-visual field asymmetries and between-visual field asymmetries. We explain these asymmetries in terms of perceptual aspects or tasks, the what of the asymmetries; and in terms of underlying mechanisms, the why of the asymmetries. Tthe within-visual field asymmetries are fundamental to orientation, motion direction, and spatial frequency processing. between-visual field asymmetries have been reported for a wide range of perceptual phenomena. foveal dominance over the periphery, in particular, has been prominent for visual acuity, contrast sensitivity, and colour discrimination. Tthis also holds true for object or face recognition and reading performance. upper-lower visual field asymmetries in favour of the lower have been demonstrated for temporal and contrast sensitivities, visual acuity, spatial resolution, orientation, hue and motion processing. Iin contrast, the upper field advantages have been seen in visual search, apparent size, and object recognition tasks. left-right visual field asymmetries include the left field dominance in spatial (e.g., orientation) processing and the right field dominance in non-spatial (e.g., temporal) processing. left field is also better at low spatial frequency or global and coordinate spatial processing, whereas the right field is better at high spatial frequency or local and categorical spatial processing. All these asymmetries have inborn neural/physiological origins, the primary why, but can be also susceptible to visual experience, the critical why (promotes or blocks the asymmetries by altering neural functions).read more
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Detection of Central White Matter Injury Underlying Vestibulopathy after Mild Traumatic Brain Injury
TL;DR: DTI findings in patients with mild TBI and vestibular symptoms support the hypothesis that posttraumatic vestibulopathy has a central axonal injury component.
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Radial asymmetries in population receptive field size and cortical magnification factor in early visual cortex.
Maria de Fátima Silva,Jan W. Brascamp,Sonia Maria Soares Ferreira,Miguel Castelo-Branco,Serge O. Dumoulin,Ben M. Harvey,Ben M. Harvey +6 more
TL;DR: Differences in pRF size and CMF vary gradually with polar angle and are not limited to the meridians or visual field map discontinuities, which may underlie consistent reports of asymmetries in perceptual abilities.
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The ganglion cell and cone distributions in the monkey's retina: Implications for central magnification factors
V H Perry,Alan Cowey +1 more
TL;DR: The distribution of cones and ganglion cells was determined in whole-mounted monkey retinae as discussed by the authors, showing that the relative representation of the fovea increases substantially in both thalamus and cortex.
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Right hemispheric dominance of visual phenomena evoked by intracerebral stimulation of the human visual cortex.
Jacques Jonas,Solène Frismand,J.-P. Vignal,Sophie Colnat-Coulbois,Laurent Koessler,Hervé Vespignani,Bruno Rossion,Louis Maillard +7 more
TL;DR: The greater sensitivity of the right occipito‐parieto‐temporal regions to intracerebral electrical stimulation to evoke visual phenomena supports a predominant role of right hemispheric visual areas from perception to recognition of visual forms, regardless of visuospatial and attentional factors.
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Individual differences in visual field shape modulate the effects of attention on the lower visual field advantage in crowding.
TL;DR: It is demonstrated that the relationship between visual field extent and perceptual asymmetry is most evident when participants are able to focus their attention on the target location, and important influences of visual field boundaries on visual perception are revealed, even for visual field locations far from those boundaries.
References
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David H. Hubel,Torsten N. Wiesel +1 more
TL;DR: The striate cortex was studied in lightly anaesthetized macaque and spider monkeys by recording extracellularly from single units and stimulating the retinas with spots or patterns of light, with response properties very similar to those previously described in the cat.
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