The Experts below are selected from a list of 167979 Experts worldwide ranked by ideXlab platform
Yasunari Yokota - One of the best experts on this subject based on the ideXlab platform.
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influence of spatio Temporal Frequency of dynamic textures on fixational eye movement in central and peripheral vision
2015Co-Authors: Masae Yokota, Yasunari YokotaAbstract:Our eyes move slightly and rapidly, even while we gaze at an object. If fixational eye movement is inhibited, visual objects begin to fade until we ultimately cannot see them at all. Involuntary fixational eye movement is essential for the acquisition of visual information, as neurons become inactive when exposed to continuous homogeneous visual stimuli. Involuntary fixational eye movement is believed to be generated by random neural activation. In this study, we focused on the other role of eye movement. It is supposed that fixational eye movement is affected by perception of a visual stimulus. Thus, involuntary fixational eye movement might be controlled by perception. We measured subjects’ fixational eye movement while dynamic textures with limited spatio-Temporal Frequency were presented to their central or peripheral visual field. Results indicated that recorded fixational eye movements are influenced by the spatio-Temporal Frequency sensitivity of vision. The higher Frequency component of the fixational eye movement in both central and in peripheral vision increases when the dynamic texture of a stimulus has a spatio-Temporal Frequency of a higher visual sensitivity.
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Involuntary Eye Movement during Fixation is Influenced by Spatio-Temporal Frequency of Visual Stimuli.
i-Perception, 2011Co-Authors: Masae Yokota, Yasunari YokotaAbstract:Involuntary eye movement during fixation is essential for visual information acquisition. Previous studies have suggested that such eye movement depends on the attributes of visual stimuli (e.g. Yokota, APCV2010). In this study, we focus on spatio-Temporal Frequency, as an attribute of visual stimuli in order to understand spatio-Temporal Frequency property in the pathway of human vision. We measured eye movement during fixation for three subjects when 16 random-dot dynamic textures that have various Frequency bands in spatially and Temporally, are presented to the subjects as visual stimuli. The result shows that eye movement depends on the spatio-Temporal Frequency of visual stimuli. The eye movement includes higher Frequency components, in other words, higher velocity components, when visual stimulus has higher spatial Frequency and/or higher Temporal Frequency. Future detailed experiments will show that involuntary eye movement during fixation might be influenced by spatio-Temporal Frequency sensitivi...
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Involuntary Eye Movement during Fixation Depends on Spatio-Temporal Frequency of Stimuli
IFMBE Proceedings, 2011Co-Authors: Masae Yokota, Yasunari YokotaAbstract:Our eyes oscillate small and rapidly, even while we gaze at something. Visual objects become to fade and we can see nothing, if involuntary eye movement is eliminated temporarily. Involuntary eye movement is essential to acquire visual information. As preliminary experiment, we have been recorded eye movement when filling-in, one of famous visual illusions, occurs in our peripheral vision (EMBEC2008). These experiments suggested that eye movement depends on the attributes of visual stimuli. In this study, we focus on spatioTemporal Frequency as an attribute of visual stimuli in order to understand spatio-Temporal Frequency property in the pathway of human vision. In this study, we measured eye movement during fixation when 16 random-dot dynamic textures that have various Frequency bands in spatially and Temporally, are presented to the subjects as visual stimuli. The result shows that eye movement depends on both spatial and Temporal frequencies of visual stimuli. The eye movement includes higher Frequency components, in other words, higher velocity components, when visual stimulus has higher spatial Frequency and/or higher Temporal Frequency.
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Facilitation of perceptual filling-in for spatio-Temporal Frequency of dynamic textures
2005 IEEE Engineering in Medicine and Biology 27th Annual Conference, 2005Co-Authors: Masae Yokota, Yasunari YokotaAbstract:Objects are perceived to fade and disappear within a few seconds under certain conditions when a small object surrounded by a moving texture is presented in human peripheral vision. This phenomenon is called perceptual filling-in or fading. Investigation of filling-in properties is important to understand visual information capture and processing. Previous studies have adopted filling-in time to evaluate the facilitation of filling-in. From this viewpoint, we propose a model of the filling-in process to address the phenomenon by which a small homogeneous area (filling-in target), which is surrounded by spatio-Temporal Frequency limited random-dot dynamic textures, is presented to an observer's peripheral vision (Proc. IC-EMBS2003). The model expresses target distinguishability from the surrounding texture. This study measured time to filling-in for various spatio-Temporal frequencies of target-surrounding dynamic textures. Spatio-Temporal Frequency sensitivity of human vision was also estimated. Applying these results to the proposed model, it was suggested that M-channel pathway of LGN facilitates perceptual filling-in. In contrast, the P-channel pathway is assumed not to facilitate, but rather inhibit, filling-in
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The Relationship between Filling-in Induction and Spatio-Temporal Frequency of Sorrounding Dynamic Textures
IEEJ Transactions on Electronics Information and Systems, 2003Co-Authors: Masae Yokota, Yasunari YokotaAbstract:To elucidate perceptual filling-in mechanisms in peripheral vision, we investigated dependency of filling-in occurrence on spatio-Temporal Frequency of dynamic textures surrounding the filling-in target. We first measured spatial Frequency sensitivity of the filling-in target in static texture. Then, the time to filling-in, when dynamic textures which have variously limited spatio-Temporal Frequency are surrounding the filling-in target, were measured. According to the hypothesis of filling-in process which has already proposed by the authors, the tendency of inducing filling-in, i.e., the attenuation factor of perceptual power for filling-in target in dynamic textures, is estimated as a function of spatio-Temporal Frequency. It was suggested that surrounding texture with stronger perception promotes filling-in more intensively.
Masae Yokota - One of the best experts on this subject based on the ideXlab platform.
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influence of spatio Temporal Frequency of dynamic textures on fixational eye movement in central and peripheral vision
2015Co-Authors: Masae Yokota, Yasunari YokotaAbstract:Our eyes move slightly and rapidly, even while we gaze at an object. If fixational eye movement is inhibited, visual objects begin to fade until we ultimately cannot see them at all. Involuntary fixational eye movement is essential for the acquisition of visual information, as neurons become inactive when exposed to continuous homogeneous visual stimuli. Involuntary fixational eye movement is believed to be generated by random neural activation. In this study, we focused on the other role of eye movement. It is supposed that fixational eye movement is affected by perception of a visual stimulus. Thus, involuntary fixational eye movement might be controlled by perception. We measured subjects’ fixational eye movement while dynamic textures with limited spatio-Temporal Frequency were presented to their central or peripheral visual field. Results indicated that recorded fixational eye movements are influenced by the spatio-Temporal Frequency sensitivity of vision. The higher Frequency component of the fixational eye movement in both central and in peripheral vision increases when the dynamic texture of a stimulus has a spatio-Temporal Frequency of a higher visual sensitivity.
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Involuntary Eye Movement during Fixation is Influenced by Spatio-Temporal Frequency of Visual Stimuli.
i-Perception, 2011Co-Authors: Masae Yokota, Yasunari YokotaAbstract:Involuntary eye movement during fixation is essential for visual information acquisition. Previous studies have suggested that such eye movement depends on the attributes of visual stimuli (e.g. Yokota, APCV2010). In this study, we focus on spatio-Temporal Frequency, as an attribute of visual stimuli in order to understand spatio-Temporal Frequency property in the pathway of human vision. We measured eye movement during fixation for three subjects when 16 random-dot dynamic textures that have various Frequency bands in spatially and Temporally, are presented to the subjects as visual stimuli. The result shows that eye movement depends on the spatio-Temporal Frequency of visual stimuli. The eye movement includes higher Frequency components, in other words, higher velocity components, when visual stimulus has higher spatial Frequency and/or higher Temporal Frequency. Future detailed experiments will show that involuntary eye movement during fixation might be influenced by spatio-Temporal Frequency sensitivi...
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Involuntary Eye Movement during Fixation Depends on Spatio-Temporal Frequency of Stimuli
IFMBE Proceedings, 2011Co-Authors: Masae Yokota, Yasunari YokotaAbstract:Our eyes oscillate small and rapidly, even while we gaze at something. Visual objects become to fade and we can see nothing, if involuntary eye movement is eliminated temporarily. Involuntary eye movement is essential to acquire visual information. As preliminary experiment, we have been recorded eye movement when filling-in, one of famous visual illusions, occurs in our peripheral vision (EMBEC2008). These experiments suggested that eye movement depends on the attributes of visual stimuli. In this study, we focus on spatioTemporal Frequency as an attribute of visual stimuli in order to understand spatio-Temporal Frequency property in the pathway of human vision. In this study, we measured eye movement during fixation when 16 random-dot dynamic textures that have various Frequency bands in spatially and Temporally, are presented to the subjects as visual stimuli. The result shows that eye movement depends on both spatial and Temporal frequencies of visual stimuli. The eye movement includes higher Frequency components, in other words, higher velocity components, when visual stimulus has higher spatial Frequency and/or higher Temporal Frequency.
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Facilitation of perceptual filling-in for spatio-Temporal Frequency of dynamic textures
2005 IEEE Engineering in Medicine and Biology 27th Annual Conference, 2005Co-Authors: Masae Yokota, Yasunari YokotaAbstract:Objects are perceived to fade and disappear within a few seconds under certain conditions when a small object surrounded by a moving texture is presented in human peripheral vision. This phenomenon is called perceptual filling-in or fading. Investigation of filling-in properties is important to understand visual information capture and processing. Previous studies have adopted filling-in time to evaluate the facilitation of filling-in. From this viewpoint, we propose a model of the filling-in process to address the phenomenon by which a small homogeneous area (filling-in target), which is surrounded by spatio-Temporal Frequency limited random-dot dynamic textures, is presented to an observer's peripheral vision (Proc. IC-EMBS2003). The model expresses target distinguishability from the surrounding texture. This study measured time to filling-in for various spatio-Temporal frequencies of target-surrounding dynamic textures. Spatio-Temporal Frequency sensitivity of human vision was also estimated. Applying these results to the proposed model, it was suggested that M-channel pathway of LGN facilitates perceptual filling-in. In contrast, the P-channel pathway is assumed not to facilitate, but rather inhibit, filling-in
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The Relationship between Filling-in Induction and Spatio-Temporal Frequency of Sorrounding Dynamic Textures
IEEJ Transactions on Electronics Information and Systems, 2003Co-Authors: Masae Yokota, Yasunari YokotaAbstract:To elucidate perceptual filling-in mechanisms in peripheral vision, we investigated dependency of filling-in occurrence on spatio-Temporal Frequency of dynamic textures surrounding the filling-in target. We first measured spatial Frequency sensitivity of the filling-in target in static texture. Then, the time to filling-in, when dynamic textures which have variously limited spatio-Temporal Frequency are surrounding the filling-in target, were measured. According to the hypothesis of filling-in process which has already proposed by the authors, the tendency of inducing filling-in, i.e., the attenuation factor of perceptual power for filling-in target in dynamic textures, is estimated as a function of spatio-Temporal Frequency. It was suggested that surrounding texture with stronger perception promotes filling-in more intensively.
Tobias Bonhoeffer - One of the best experts on this subject based on the ideXlab platform.
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Spatio-Temporal Frequency domains and their relation to cytochrome oxidase staining in cat visual cortex.
Nature, 1997Co-Authors: Doron Shoham, Mark Hübener, Silke Schulze, Amiram Grinvald, Tobias BonhoefferAbstract:Spatial and Temporal frequencies are important attributes of the visual scene. It is a long-standing question whether these attributes are represented in a spatially organized way in cat primary visual cortex1–4. Using optical imaging of intrinsic signals5–10, we show here that grating stimuli of different spatial frequencies drifting at various speeds produce distinct activity patterns. Rather than observing a map of continuously changing spatial Frequency preference across the cortical surface, we found only two distinct sets of domains, one preferring low spatial Frequency and high speed, and the other high spatial Frequency and low speed. We compared the arrangement of these spatio–Temporal Frequency domains with the cytochrome oxidase staining pattern, which, based on work in primate striate cortex, is thought to reflect the partition of the visual cortex into different processing streams. We found that the cytochrome oxidase blobs in cat striate cortex coincide with domains engaged in the processing of low spatial and high Temporal Frequency contents of the visual scene. Together with other recent results11, our data suggest that spatio–Temporal Frequency domains are a manifestation of parallel streams in cat visual cortex, with distinct patterns of thalamic inputs and extrastriate projections.
W. Martin Usrey - One of the best experts on this subject based on the ideXlab platform.
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Orientation Tuning, But Not Direction Selectivity, Is Invariant to Temporal Frequency in Primary Visual Cortex
Journal of neurophysiology, 2005Co-Authors: Bartlett D. Moore, Henry J. Alitto, W. Martin UsreyAbstract:The activity of neurons in primary visual cortex is influenced by the orientation, contrast, and Temporal Frequency of a visual stimulus. This raises the question of how these stimulus properties i...
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Influence of contrast on orientation and Temporal Frequency tuning in ferret primary visual cortex.
Journal of neurophysiology, 2004Co-Authors: Henry J. Alitto, W. Martin UsreyAbstract:Neurons in primary visual cortex are highly sensitive to the contrast, orientation, and Temporal Frequency of a visual stimulus. These three stimulus properties can be varied independently of one a...
Doron Shoham - One of the best experts on this subject based on the ideXlab platform.
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Spatio-Temporal Frequency domains and their relation to cytochrome oxidase staining in cat visual cortex.
Nature, 1997Co-Authors: Doron Shoham, Mark Hübener, Silke Schulze, Amiram Grinvald, Tobias BonhoefferAbstract:Spatial and Temporal frequencies are important attributes of the visual scene. It is a long-standing question whether these attributes are represented in a spatially organized way in cat primary visual cortex1–4. Using optical imaging of intrinsic signals5–10, we show here that grating stimuli of different spatial frequencies drifting at various speeds produce distinct activity patterns. Rather than observing a map of continuously changing spatial Frequency preference across the cortical surface, we found only two distinct sets of domains, one preferring low spatial Frequency and high speed, and the other high spatial Frequency and low speed. We compared the arrangement of these spatio–Temporal Frequency domains with the cytochrome oxidase staining pattern, which, based on work in primate striate cortex, is thought to reflect the partition of the visual cortex into different processing streams. We found that the cytochrome oxidase blobs in cat striate cortex coincide with domains engaged in the processing of low spatial and high Temporal Frequency contents of the visual scene. Together with other recent results11, our data suggest that spatio–Temporal Frequency domains are a manifestation of parallel streams in cat visual cortex, with distinct patterns of thalamic inputs and extrastriate projections.
