The Experts below are selected from a list of 35010 Experts worldwide ranked by ideXlab platform
Andrea Serino - One of the best experts on this subject based on the ideXlab platform.
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Neural Adaptation accounts for the dynamic resizing of peripersonal space evidence from a psychophysical computational approach
Journal of Neurophysiology, 2018Co-Authors: Jeanpaul Noel, Andrea Serino, Olaf Blanke, Elisa MagossoAbstract:Interactions between the body and the environment occur within the Peri-Personal Space (PPS), the space immediately surrounding the body. The PPS is encoded by multisensory (audio-tactile, visual-tactile) neurons that possess receptive fields (RFs) anchored on the body and restricted in depth. The extension in depth of PPS neurons' RFs has been documented to change dynamically as a function of the velocity of incoming stimuli, but the underlying Neural mechanisms are still unknown. Here, by integrating a psychophysical approach with Neural network modeling, we propose a mechanistic explanation behind this inherent dynamic property of PPS. We psychophysically mapped the size of participant's peri-face and peri-trunk space as a function of the velocity of task-irrelevant approaching auditory stimuli. Findings indicated that the peri-trunk space was larger than the peri-face space, and importantly, as for the neurophysiological delineation of RFs, both of these representations enlarged as the velocity of inc...
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Neural Adaptation accounts for the dynamic resizing of peripersonal space: evidence from a psychophysical-computational approach.
Journal of Neurophysiology, 2018Co-Authors: Jeanpaul Noel, Olaf Blanke, Elisa Magosso, Andrea SerinoAbstract:Interactions between body and environment occur within the peripersonal space (PPS). PPS neurons are highly dynamic, adapting online as a function of body-object interactions. The mechanistic under...
Jeanpaul Noel - One of the best experts on this subject based on the ideXlab platform.
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Neural Adaptation accounts for the dynamic resizing of peripersonal space evidence from a psychophysical computational approach
Journal of Neurophysiology, 2018Co-Authors: Jeanpaul Noel, Andrea Serino, Olaf Blanke, Elisa MagossoAbstract:Interactions between the body and the environment occur within the Peri-Personal Space (PPS), the space immediately surrounding the body. The PPS is encoded by multisensory (audio-tactile, visual-tactile) neurons that possess receptive fields (RFs) anchored on the body and restricted in depth. The extension in depth of PPS neurons' RFs has been documented to change dynamically as a function of the velocity of incoming stimuli, but the underlying Neural mechanisms are still unknown. Here, by integrating a psychophysical approach with Neural network modeling, we propose a mechanistic explanation behind this inherent dynamic property of PPS. We psychophysically mapped the size of participant's peri-face and peri-trunk space as a function of the velocity of task-irrelevant approaching auditory stimuli. Findings indicated that the peri-trunk space was larger than the peri-face space, and importantly, as for the neurophysiological delineation of RFs, both of these representations enlarged as the velocity of inc...
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Neural Adaptation accounts for the dynamic resizing of peripersonal space: evidence from a psychophysical-computational approach.
Journal of Neurophysiology, 2018Co-Authors: Jeanpaul Noel, Olaf Blanke, Elisa Magosso, Andrea SerinoAbstract:Interactions between body and environment occur within the peripersonal space (PPS). PPS neurons are highly dynamic, adapting online as a function of body-object interactions. The mechanistic under...
Stephen L. Macknik - One of the best experts on this subject based on the ideXlab platform.
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The impact of microsaccades on vision: towards a unified theory of saccadic function
Nature reviews. Neuroscience, 2013Co-Authors: Susana Martinez-conde, Jorge Otero-millan, Stephen L. MacknikAbstract:When we attempt to fix our gaze, our eyes nevertheless produce so-called 'fixational eye movements', which include microsaccades, drift and tremor. Fixational eye movements thwart Neural Adaptation to unchanging stimuli and thus prevent and reverse perceptual fading during fixation. Over the past 10 years, microsaccade research has become one of the most active fields in visual, oculomotor and even cognitive neuroscience. The similarities and differences between microsaccades and saccades have been a most intriguing area of study, and the results of this research are leading us towards a unified theory of saccadic and microsaccadic function.
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Fixational eye movements across vertebrates: comparative dynamics, physiology, and perception.
Journal of vision, 2008Co-Authors: Susana Martinez-conde, Stephen L. MacknikAbstract:During visual fixation, human eyes are never still. Instead, they constantly produce involuntary "fixational eye movements." Fixational eye movements overcome Neural Adaptation and prevent visual fading: thus they are an important tool to understand how the brain makes the environment visible. The last decade has seen a growing interest in the analysis of fixational eye movements in humans and primates, as well as in their perceptual and physiological consequences. However, no comprehensive comparison of fixational eye movements across species has been offered. Here we review five decades of fixational eye movement studies in non-human vertebrates, and we discuss the existing evidence concerning their physiological and perceptual effects. We also provide a table that summarizes the physical parameters of the different types of fixational eye movements described in non-human vertebrates.
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the role of fixational eye movements in visual perception
Nature Reviews Neuroscience, 2004Co-Authors: Susana Martinezconde, Stephen L. Macknik, David H HubelAbstract:Our eyes continually move even while we fix our gaze on an object. Although these fixational eye movements have a magnitude that should make them visible to us, we are unaware of them. If fixational eye movements are counteracted, our visual perception fades completely as a result of Neural Adaptation. So, our visual system has a built-in paradox — we must fix our gaze to inspect the minute details of our world, but if we were to fixate perfectly, the entire world would fade from view. Owing to their role in counteracting Adaptation, fixational eye movements have been studied to elucidate how the brain makes our environment visible. Moreover, because we are not aware of these eye movements, they have been studied to understand the underpinnings of visual awareness. Recent studies of fixational eye movements have focused on determining how visible perception is encoded by neurons in various visual areas of the brain.
Sanghun Lee - One of the best experts on this subject based on the ideXlab platform.
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s4 2 hierarchy of direction tuned motion Adaptation in human visual cortex
I-perception, 2012Co-Authors: Sanghun LeeAbstract:Prolonged exposure to a single direction of motion alters perception of subsequent static or dynamic stimuli and induces substantial changes in behaviors of motion-sensitive neurons, but it remains unclear about an origin of Neural Adaptation and Neural correlates of perceptual consequences of motion Adaptation in human brain. Using functional magnetic resonance imaging (fMRI), we measured motion Adaptation tuning curves in a fine scale by probing changes in cortical activity after Adaptation for a range of directions relative to the adapted direction. We found a clear dichotomy in tuning curve shape: cortical responses in early-tier visual areas reduced at around both the adapted and opposite direction, resulting in a bi-directional tuning curve, whereas response reduction in high-tier areas occurred only at around the adapted direction, resulting in a uni-directional tuning curve. We also found that the psychophysically measured Adaptation tuning curves were uni-directional and best matched the cortical...
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hierarchy of direction tuned motion Adaptation in human visual cortex
Journal of Neurophysiology, 2012Co-Authors: Hyunah Lee, Sanghun LeeAbstract:Prolonged exposure to a single direction of motion alters perception of subsequent static or dynamic stimuli and induces substantial changes in behaviors of motion-sensitive neurons, but the origin of Neural Adaptation and Neural correlates of perceptual consequences of motion Adaptation in human brain remain unclear. Using functional magnetic resonance imaging, we measured motion Adaptation tuning curves in a fine scale by probing changes in cortical activity after Adaptation for a range of directions relative to the adapted direction. We found a clear dichotomy in tuning curve shape: cortical responses in early-tier visual areas reduced at around both the adapted and opposite direction, resulting in a bidirectional tuning curve, whereas response reduction in high-tier areas occurred only at around the adapted direction, resulting in a unidirectional tuning curve. We also found that the psychophysically measured Adaptation tuning curves were unidirectional and best matched the cortical Adaptation tuning curves in the middle temporal area (MT) and the medial superior temporal area (MST). Our findings are compatible with, but not limited to, an interpretation in which direct impacts of motion Adaptation occur in both unidirectional and bidirectional units in early visual areas, but the perceptual consequences of motion Adaptation are manifested in the population activity in MT and MST, which may inherit those direct impacts of Adaptation from the directionally selective units.
Olaf Blanke - One of the best experts on this subject based on the ideXlab platform.
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Neural Adaptation accounts for the dynamic resizing of peripersonal space evidence from a psychophysical computational approach
Journal of Neurophysiology, 2018Co-Authors: Jeanpaul Noel, Andrea Serino, Olaf Blanke, Elisa MagossoAbstract:Interactions between the body and the environment occur within the Peri-Personal Space (PPS), the space immediately surrounding the body. The PPS is encoded by multisensory (audio-tactile, visual-tactile) neurons that possess receptive fields (RFs) anchored on the body and restricted in depth. The extension in depth of PPS neurons' RFs has been documented to change dynamically as a function of the velocity of incoming stimuli, but the underlying Neural mechanisms are still unknown. Here, by integrating a psychophysical approach with Neural network modeling, we propose a mechanistic explanation behind this inherent dynamic property of PPS. We psychophysically mapped the size of participant's peri-face and peri-trunk space as a function of the velocity of task-irrelevant approaching auditory stimuli. Findings indicated that the peri-trunk space was larger than the peri-face space, and importantly, as for the neurophysiological delineation of RFs, both of these representations enlarged as the velocity of inc...
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Neural Adaptation accounts for the dynamic resizing of peripersonal space: evidence from a psychophysical-computational approach.
Journal of Neurophysiology, 2018Co-Authors: Jeanpaul Noel, Olaf Blanke, Elisa Magosso, Andrea SerinoAbstract:Interactions between body and environment occur within the peripersonal space (PPS). PPS neurons are highly dynamic, adapting online as a function of body-object interactions. The mechanistic under...
