The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Wataru Teramoto - One of the best experts on this subject based on the ideXlab platform.
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Touch-contingent visual Motion Perception: tactile events drive visual Motion Perception
Experimental brain research, 2016Co-Authors: Ryo Teraoka, Wataru TeramotoAbstract:It has recently been demonstrated that the brain rapidly forms an association between concurrently presented sound sequences and visual Motion. Once this association has been formed, the associated sound sequence can drive visual Motion Perception. This phenomenon is known as "sound-contingent visual Motion Perception" (SCVM). In the present study, we addressed the possibility of a similar association involving touch instead of audition. In a 9-min exposure session, two circles placed side by side were alternately presented to produce apparent Motion in a horizontal direction. The onsets of the circle presentations were synchronized with vibrotactile stimulation on two different positions of the forearm. We then quantified pre- and post-exposure perceptual changes using a Motion-nulling procedure. Results showed that after prolonged exposure to visuotactile stimuli, the tactile sequence influenced visual Motion Perception. Notably, this effect was specific to the previously exposed visual field, thus ruling out the possibility of simple response bias. These findings suggest that SCVM-like associations occur, at least to some extent, for the other modality combinations. Furthermore, the effect did not occur when the forearm posture was changed between the exposure and test phases, suggesting that the association is formed after integrating proprioceptive information.
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Auditory Motion Information Drives Visual Motion Perception
PloS one, 2011Co-Authors: Souta Hidaka, Wataru Teramoto, Yoichi Sugita, Yuko Manaka, Shuichi Sakamoto, Yôiti SuzukiAbstract:Background Vision provides the most salient information with regard to the stimulus Motion. However, it has recently been demonstrated that static visual stimuli are perceived as moving laterally by alternating left-right sound sources. The underlying mechanism of this phenomenon remains unclear; it has not yet been determined whether auditory Motion signals, rather than auditory positional signals, can directly contribute to visual Motion Perception. Methodology/Principal Findings Static visual flashes were presented at retinal locations outside the fovea together with a lateral auditory Motion provided by a virtual stereo noise source smoothly shifting in the horizontal plane. The flash appeared to move by means of the auditory Motion when the spatiotemporal position of the flashes was in the middle of the auditory Motion trajectory. Furthermore, the lateral auditory Motion altered visual Motion Perception in a global Motion display where different localized Motion signals of multiple visual stimuli were combined to produce a coherent visual Motion Perception. Conclusions/Significance These findings suggest there exist direct interactions between auditory and visual Motion signals, and that there might be common neural substrates for auditory and visual Motion processing.
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Visual Motion Perception induced by sounds in vertical plane.
Neuroscience letters, 2010Co-Authors: Wataru Teramoto, Souta Hidaka, Yoichi Sugita, Yuko Manaka, Shuichi Sakamoto, Ryota Miyauchi, Jiro Gyoba, Yukio Iwaya, Yôiti SuzukiAbstract:The alternation of sounds in the left and right ears induces Motion Perception of a static visual stimulus (SIVM: Sound-Induced Visual Motion). In this case, binaural cues were of considerable benefit in perceiving locations and movements of the sounds. The present study investigated how a spectral cue - another important cue for sound localization and Motion Perception - contributed to the SIVM. In experiments, two alternating sound sources aligned in the vertical plane were presented, synchronized with a static visual stimulus. We found that the proportion of the SIVM and the magnitude of the perceived movements of the static visual stimulus increased with an increase of retinal eccentricity (1.875-30 degree), indicating the influence of the spectral cue on the SIVM. These findings suggest that the SIVM can be generalized to the whole two dimensional audio-visual space, and strongly imply that there are common neural substrates for auditory and visual Motion Perception in the brain.
Yôiti Suzuki - One of the best experts on this subject based on the ideXlab platform.
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Auditory Motion Information Drives Visual Motion Perception
PloS one, 2011Co-Authors: Souta Hidaka, Wataru Teramoto, Yoichi Sugita, Yuko Manaka, Shuichi Sakamoto, Yôiti SuzukiAbstract:Background Vision provides the most salient information with regard to the stimulus Motion. However, it has recently been demonstrated that static visual stimuli are perceived as moving laterally by alternating left-right sound sources. The underlying mechanism of this phenomenon remains unclear; it has not yet been determined whether auditory Motion signals, rather than auditory positional signals, can directly contribute to visual Motion Perception. Methodology/Principal Findings Static visual flashes were presented at retinal locations outside the fovea together with a lateral auditory Motion provided by a virtual stereo noise source smoothly shifting in the horizontal plane. The flash appeared to move by means of the auditory Motion when the spatiotemporal position of the flashes was in the middle of the auditory Motion trajectory. Furthermore, the lateral auditory Motion altered visual Motion Perception in a global Motion display where different localized Motion signals of multiple visual stimuli were combined to produce a coherent visual Motion Perception. Conclusions/Significance These findings suggest there exist direct interactions between auditory and visual Motion signals, and that there might be common neural substrates for auditory and visual Motion processing.
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Visual Motion Perception induced by sounds in vertical plane.
Neuroscience letters, 2010Co-Authors: Wataru Teramoto, Souta Hidaka, Yoichi Sugita, Yuko Manaka, Shuichi Sakamoto, Ryota Miyauchi, Jiro Gyoba, Yukio Iwaya, Yôiti SuzukiAbstract:The alternation of sounds in the left and right ears induces Motion Perception of a static visual stimulus (SIVM: Sound-Induced Visual Motion). In this case, binaural cues were of considerable benefit in perceiving locations and movements of the sounds. The present study investigated how a spectral cue - another important cue for sound localization and Motion Perception - contributed to the SIVM. In experiments, two alternating sound sources aligned in the vertical plane were presented, synchronized with a static visual stimulus. We found that the proportion of the SIVM and the magnitude of the perceived movements of the static visual stimulus increased with an increase of retinal eccentricity (1.875-30 degree), indicating the influence of the spectral cue on the SIVM. These findings suggest that the SIVM can be generalized to the whole two dimensional audio-visual space, and strongly imply that there are common neural substrates for auditory and visual Motion Perception in the brain.
Ayse Pinar Saygin - One of the best experts on this subject based on the ideXlab platform.
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The role of human ventral visual cortex in Motion Perception
Brain, 2013Co-Authors: Sharon Gilaie-dotan, Ayse Pinar Saygin, Lauren J. Lorenzi, Ryan Egan, Geraint Rees, Marlene BehrmannAbstract:Visual Motion Perception is fundamental to many aspects of visual Perception. Visual Motion Perception has long been associated with the dorsal (parietal) pathway and the involvement of the ventral ‘form’ (temporal) visual pathway has not been considered critical for normal Motion Perception. Here, we evaluated this view by examining whether circumscribed damage to ventral visual cortex impaired Motion Perception. The Perception of Motion in basic, non-form tasks (Motion coherence and Motion detection) and complex structure-from-Motion, for a wide range of Motion speeds, all centrally displayed, was assessed in five patients with a circumscribed lesion to either the right or left ventral visual pathway. Patients with a right, but not with a left, ventral visual lesion displayed widespread impairments in central Motion Perception even for non-form Motion, for both slow and for fast speeds, and this held true independent of the integrity of areas MT/V5, V3A or parietal regions. In contrast with the traditional view in which only the dorsal visual stream is critical for Motion Perception, these novel findings implicate a more distributed circuit in which the integrity of the right ventral visual pathway is also necessary even for the Perception of non-form Motion.
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superior temporal and premotor brain areas necessary for biological Motion Perception
Brain, 2007Co-Authors: Ayse Pinar SayginAbstract:We tested biological Motion Perception in a large group of unilateral stroke patients (N = 60). Both right and left hemisphere lesioned patients were significantly impaired compared with age-matched controls. Voxel-based lesion analyses revealed that lesions in superior temporal and premotor frontal areas had the greatest effect on biological Motion Perception. Moreover, the effect in each region was independent, and not attributable to indirect effects of lesions in the other area. When we explored functional magnetic resonance imaging (fMRI) data collected from neurologically healthy controls in a separate experiment in relation to the lesion maps, we found that the two methods converged on their findings. We thus establish that superior temporal and premotor areas are not only involved in biological Motion Perception, but also have causal relationships to deficits in biological Motion Perception. While the precise functional roles of each region remain to be identified, this network has been implicated in the Perception of action stimuli in many studies and as such patients' deficits may reflect an inability to effectively engage the action observation system.
Jason J.s. Barton - One of the best experts on this subject based on the ideXlab platform.
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Blindsight Modulation of Motion Perception
Journal of cognitive neuroscience, 2002Co-Authors: James Intriligator, Ruiman Xie, Jason J.s. BartonAbstract:Monkey data suggest that of all perceptual abilities, Motion Perception is the most likely to survive striate damage. The results of studies on Motion blindsight in humans, though, are mixed. We used an indirect strategy to examine how responses to visible stimuli were modulated by blind-field stimuli. In a 26-year-old man with focal striate lesions, discrimination of visible optic flow was enhanced about 7p by blind-field flow, even though discrimination of optic flow in the blind field alone (the direct strategy) was at chance. Pursuit of an imagined target using peripheral cues showed reduced variance but not increased gain with blind-field cues. Preceding blind-field prompts shortened reaction times to visible targets by about 10 msec, but there was no attentional crowding of visible stimuli by blind-field distractors. A similar efficacy of indirect blind-field optic flow modulation was found in a second patient with residual vision after focal striate damage, but not in a third with more extensive medial occipito-temporal damage. We conclude that indirect modulatory strategies are more effective than direct forced-choice methods at revealing residual Motion Perception after focal striate lesions.
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Directional defects in pursuit and Motion Perception in humans with unilateral cerebral lesions
Brain, 1996Co-Authors: Jason J.s. Barton, James A. Sharpe, Jane E. RaymondAbstract:We tested Motion Perception and smooth pursuit in 26 patients with unilateral cerebral hemispheric lesions. We used random dot cinematograms to test Motion direction discrimination. We measured pursuit gain as they followed a predictable sinusoidal target moving horizontally at three different frequencies, and an unpredictable horizontal step-ramp target in the ipsilateral hemi-field. Six patients had defects in Motion Perception when the targets were moving towards the side of the lesions ('ipsi-directional' defects) and two had bi-directional defects. Motion Perception defects occurred with lesions of the junction of Brodmann areas 19 and 37, a putative human homologue of the monkey V5 complex. Seven patients had ipsi-directional pursuit defects, five of whom had damage to the posterior limb of the internal capsule. Only two patients had ipsi-directional defects of both Motion Perception and sinusoidal smooth pursuit. Four patients had ipsi-directional defects of Motion Perception alone, and five patients had ipsi-directional pursuit defects alone. The two patients with bi-directional defects in Motion Perception had normal sinusoidal smooth pursuit. Patients with lesions at the 19/37 junction and defects of Motion Perception alone had normal pursuit of unpredictable step-ramp targets in the ipsilateral hemi-field. In contrast, patients with ipsi-directional sinusoidal pursuit defects had decreased ipsi-directional and increased contra-directional velocities with step-ramp targets. No patient group had a Motion-specific directional defect in saccadic accuracy. We conclude that neither predictable nor unpredictable pursuit is necessarily impaired by lesions of the 19/37 junction that cause ipsi-directional defects of Motion Perception. These dissociations between smooth pursuit and Motion Perception provide evidence that the pursuit system operates as an interconnected network with parallel pathways, rather than as a simple sequential hierarchy of cortical areas.
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Motion Perception in optic neuropathy
Neurology, 1994Co-Authors: Jason J.s. Barton, Matthew RizzoAbstract:We tested Motion Perception in 15 eyes of 13 patients with optic neuropathy. Eleven of the eyes had optic neuritis. The Motion Perception paradigm tested subjects9 ability to discriminate the direction of a global coherent Motion signal amid varying levels of background noise. The results showed defective Motion processing in eight of the 15 eyes. This defect was not due to low visibility (poor spatial resolution), since 11 of the 15 eyes had Snellen acuities of 20/20 or better. Neither was impaired Motion Perception due to decreased luminance sensitivity, since attenuating the display signal by 2.1 log units (0.6 units more than the worst relative afferent pupillary defect in any patient) in five normal eyes had no effect. Motion Perception and critical flicker fusion were independent of each other. Given proposals that both depend exclusively on the same M, or transient, channel, we had not predicted this double dissociation between flicker and Motion Perception.
Yue Chen - One of the best experts on this subject based on the ideXlab platform.
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Deficient biological Motion Perception in schizophrenia: results from a Motion noise paradigm
Frontiers in psychology, 2013Co-Authors: Jejoong Kim, Daniel Norton, Ryan Mcbain, Dost Öngür, Yue ChenAbstract:Background: Schizophrenia patients exhibit deficient processing of perceptual and cognitive information. However, it is not well understood how basic perceptual deficits contribute to higher level cognitive problems in this mental disorder. Perception of biological Motion, a Motion-based cognitive recognition task, relies on both basic visual Motion processing and social cognitive processing, thus providing a useful paradigm to evaluate the potentially hierarchical relationship between these two levels of information processing. Methods: In this study, we designed a biological Motion paradigm in which basic visual Motion signals were manipulated systematically by incorporating different levels of Motion noise. We measured the performances of schizophrenia patients (n=21) and healthy controls (n=22) in this biological Motion Perception task, as well as in coherent Motion detection, theory of mind, and a widely used biological Motion recognition task. Results: Schizophrenia patients performed the biological Motion Perception task with significantly lower accuracy than healthy controls when perceptual signals were moderately degraded by noise. A more substantial degradation of perceptual signals, through using additional noise, impaired biological Motion Perception in both groups. Performance levels on biological Motion recognition, coherent Motion detection and theory of mind tasks were also reduced in patients. Conclusion: The results from the Motion-noise biological Motion paradigm indicate that in the presence of visual Motion noise, the processing of biological Motion information in schizophrenia is deficient. Combined with the results of poor basic visual Motion Perception (coherent Motion task) and biological Motion recognition, the association between basic Motion signals and biological Motion Perception suggests a need to incorporate the improvement of visual Motion Perception in social cognitive remediation.
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Motion Perception in schizophrenia.
Archives of general psychiatry, 1999Co-Authors: Yue Chen, Germán P. Palafox, Ken Nakayama, Deborah L. Levy, Steven Matthysse, Philip S. HolzmanAbstract:Background Eye-tracking dysfunction has been found in many patients with schizophrenia and in about 40% of their first-degree biological relatives. We hypothesized that a deficit in Motion processing is associated with eye-tracking dysfunction because both Motion signals and the brain regions responsible for processing Motion signals are implicated in the generation of smooth pursuit. We examined several aspects of visual Perception, including Motion Perception, in patients with schizophrenia. Methods To evaluate Motion Perception, contrast sensitivity for velocity discrimination was measured in patients with schizophrenia (n=15) and normal control subjects (n=18). Contrast sensitivities for orientation discrimination and contrast detection were measured as control tasks. Results Patients with schizophrenia showed significantly lower contrast sensitivity (ie, higher thresholds) than normal controls for the discrimination of small velocity differences (eg, 11 vs 9 degrees/s). This reduction in contrast sensitivity was severe (up to 10-fold) in about 40% of the patients. No group differences were found on the other tasks. Conclusion The discrimination of small velocity differences is impaired in a subgroup of patients with schizophrenia.