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Journal of Biosciences 2022
Topics: Neurons; Pattern Recognition, Visual; Photic Stimulation; Visual Perception
PubMed: 36222158
DOI: No ID Found -
Current Biology : CB Oct 2005Although conscious perception is smooth and continuous, the input to the visual system is a series of short, discrete fixations interleaved with rapid shifts of the eye.... (Comparative Study)
Comparative Study
Although conscious perception is smooth and continuous, the input to the visual system is a series of short, discrete fixations interleaved with rapid shifts of the eye. One possible explanation for visual stability is that internal maps of objects and their visual properties are remapped around the time of saccades, but numerous studies have demonstrated that visual patterns are not combined across saccades. Here, we report that visual-form aftereffects transfer across separate fixations when adaptor and test are presented in the same spatial position. The magnitude of the transsaccadic adaptation increased with stimulus complexity, suggesting a progressive construction of spatiotopic receptive fields along the visual-form pathway. These results demonstrate that basic shape information is combined across saccades, allowing for predictive and consistent information from the past to be incorporated into each new fixation.
Topics: Humans; Pattern Recognition, Visual; Photic Stimulation; Saccades; Visual Fields; Visual Perception
PubMed: 16213821
DOI: 10.1016/j.cub.2005.08.044 -
PloS One 2011Perception of a moving visual stimulus can be suppressed or enhanced by surrounding context in adjacent parts of the visual field. We studied the neural processes...
Perception of a moving visual stimulus can be suppressed or enhanced by surrounding context in adjacent parts of the visual field. We studied the neural processes underlying such contextual modulation with fMRI. We selected motion selective regions of interest (ROI) in the occipital and parietal lobes with sufficiently well defined topography to preclude direct activation by the surround. BOLD signal in the ROIs was suppressed when surround motion direction matched central stimulus direction, and increased when it was opposite. With the exception of hMT+/V5, inserting a gap between the stimulus and the surround abolished surround modulation. This dissociation between hMT+/V5 and other motion selective regions prompted us to ask whether motion perception is closely linked to processing in hMT+/V5, or reflects the net activity across all motion selective cortex. The motion aftereffect (MAE) provided a measure of motion perception, and the same stimulus configurations that were used in the fMRI experiments served as adapters. Using a linear model, we found that the MAE was predicted more accurately by the BOLD signal in hMT+/V5 than it was by the BOLD signal in other motion selective regions. However, a substantial improvement in prediction accuracy could be achieved by using the net activity across all motion selective cortex as a predictor, suggesting the overall conclusion that visual motion perception depends upon the integration of activity across different areas of visual cortex.
Topics: Adaptation, Ocular; Adult; Brain Mapping; Humans; Magnetic Resonance Imaging; Motion Perception; Neurons; Pattern Recognition, Visual; Photic Stimulation; Visual Fields; Visual Perception; Young Adult
PubMed: 21829549
DOI: 10.1371/journal.pone.0022902 -
Nature Apr 1996
Topics: Humans; Vision, Binocular; Visual Perception
PubMed: 8602257
DOI: 10.1038/380587a0 -
Journal of the American Psychoanalytic... Jan 1960
Topics: Humans; Perception; Photic Stimulation; Psychoanalytic Interpretation; Visual Perception
PubMed: 13825151
DOI: 10.1177/000306516000800105 -
Optometry and Vision Science : Official... Sep 2001We reviewed the scientific literature on monovision to compare the visual performance of monovision patients with that of others wearing more traditional prescriptions.... (Review)
Review
We reviewed the scientific literature on monovision to compare the visual performance of monovision patients with that of others wearing more traditional prescriptions. We found that visual performance of monovision patients was comparable to that of control patients wearing a balanced binocular correction, provided that reading adds were not greater than about +2.5 D, that illumination was photopic, and that stimuli were presented at supra-threshold levels. Under these conditions, monovision patients were satisfied with their perceptual experience and performed within 2 to 6% of balanced binocular control patients on a range of occupational tasks. It is noteworthy that monovision patients had relatively more difficulty with acuity-based tasks than with tasks demanding good depth perception. With reading adds over +2.5 D, at low levels of illumination, or with near-threshold level stimuli, visual performance of monovision patients was reduced compared with controls. Subjectively, under low levels of illumination, monovision patients experienced problems with glare and halos around point sources of light.
Topics: Contact Lenses; Contrast Sensitivity; Depth Perception; Humans; Light; Presbyopia; Reading; Vision, Monocular; Visual Acuity; Visual Perception
PubMed: 11587198
DOI: 10.1097/00006324-200109000-00009 -
Journal of Vision Jul 2006Human visual perception is highly adaptive. While this has been known and studied for a long time in domains such as color vision, motion perception, or the processing...
Human visual perception is highly adaptive. While this has been known and studied for a long time in domains such as color vision, motion perception, or the processing of spatial frequency, a number of more recent studies have shown that adaptation and adaptation aftereffects also occur in high-level visual domains like shape perception and face recognition. Here, we present data that demonstrate a pronounced aftereffect in response to adaptation to the perceived gender of biological motion point-light walkers. A walker that is perceived to be ambiguous in gender under neutral adaptation appears to be male after adaptation with an exaggerated female walker and female after adaptation with an exaggerated male walker. We discuss this adaptation aftereffect as a tool to characterize and probe the mechanisms underlying biological motion perception.
Topics: Adaptation, Physiological; Adult; Afterimage; Female; Gender Identity; Humans; Male; Motion Perception; Perception; Visual Perception; Walking
PubMed: 16895463
DOI: 10.1167/6.8.7 -
Nature Jul 1990
Review
Topics: Animals; Motion Perception; Visual Cortex; Visual Perception
PubMed: 2195354
DOI: 10.1038/346106a0 -
Cephalalgia : An International Journal... Dec 1992Visual fields were mapped with kinetic are perimetry in 23 migraine with aura subjects and, for comparison, in 20 migraine without aura subjects and in 21 non-headache...
Visual fields were mapped with kinetic are perimetry in 23 migraine with aura subjects and, for comparison, in 20 migraine without aura subjects and in 21 non-headache controls. Central vision on the Amsler eye chart and visual perception threshold on a computer task were also investigated. Measures were obtained at least seven days after an episode of migraine. In addition, 10 of the migraine with aura subjects and 10 migraine without aura subjects were studied the day after an attack. The day after migraine with aura, visual sensitivity in the periphery of the visual fields was depressed, central vision was blurred, and visual perception threshold was elevated. These visual disturbances had resolved 7 to 10 days later. With the exception of a minor increase in visual perception threshold, vision was normal after attacks of migraine without aura. Residual effects of the migraine aura could mediate the subclinical visual disturbances which persist for at least one day after attacks of migraine with aura.
Topics: Adolescent; Adult; Female; Humans; Migraine Disorders; Visual Field Tests; Visual Fields; Visual Perception
PubMed: 1473135
DOI: 10.1111/j.1468-2982.1992.00349.x -
Scientific American Mar 1981
Topics: Brain; Cognition; Form Perception; Humans; Motion Perception; Pattern Recognition, Visual; Retina; Visual Perception
PubMed: 7209487
DOI: 10.1038/scientificamerican0381-145