Masatoshi Yoshida

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Patients with damage to primary visual cortex (V1) demonstrate residual performance on laboratory visual tasks despite denial of conscious seeing (blindsight) [1]. After a period of recovery, which suggests a role for plasticity [2], visual sensitivity higher than chance is observed in humans and monkeys for simple luminance-defined stimuli, grating(More)
Monkeys with unilateral lesions of the primary visual cortex (V1) can make saccades to visual stimuli in their contralateral ("affected") hemifield, but their sensitivity to luminance contrast is reduced. We examined whether the effects of V1 lesions were restricted to vision or included later stages of visual-oculomotor processing. Monkeys with unilateral(More)
Previous reports on 'blindsight' have shown that some patients with lesions of the primary visual cortex (V1) could localize visual targets in their scotoma with hand and/or eye movements without visual awareness. A role of the retino-tectal pathway on residual vision has been proposed but the direct evidence for this still remains sparse. To examine this(More)
Prior visual stimulus presentation induces immediate facilitation and subsequent inhibition of orienting to an ensuing target at the same location. Recent studies revealed that the superior colliculus (SC) is involved in these facilitatory and inhibitory cueing effects on saccade; however, as the SC receives inputs both directly from the retina(More)
A number of previous articles on blindsight have stressed that even after the lesion of the primary visual cortex (V1), subjects can perform visually guided saccades toward the targets in the blind field and that the extrageniculate visual pathway which bypasses the V1 can control the saccades by itself. However, in monkey model of V1 lesion, about two(More)
If machine audition can recognize an auditory scene containing simultaneous and moving talkers, what kinds of awareness will people gain from an auditory scene vi-sualizer? This paper presents the design and implementation of 3D Auditory Scene Visualizer based on the visual information seeking mantra, i.e., " overview first, zoom and filter, then details on(More)
In the primate brain, the primary visual cortex (V1) is a major source of visual information processing in the cerebral cortex, although some patients and monkeys with damage to the V1 show visually guided behaviors in the visual field affected by the damage. Until now, behaviors of the surviving brain regions after damage to V1 and their contribution to(More)
Microsaccades exhibit systematic oscillations in direction after spatial cueing, and these oscillations correlate with facilitatory and inhibitory changes in behavioral performance in the same tasks. However, independent of cueing, facilitatory and inhibitory changes in visual sensitivity also arise pre-microsaccadically. Given such pre-microsaccadic(More)
This paper presents the design and implementation of 3D Auditory Scene Visualizer based on the visual information seeking mantra, " overview first, zoom and filter, then details on demand ". The machine audition system called HARK captures 3D sounds with a microphone array. The natural language processing called SalienceGraph visualizes topic transition by(More)
Inherent in visual scene analysis is a bottleneck associated with the need to sequentially sample locations with foveating eye movements. The concept of a 'saliency map' topographically encoding stimulus conspicuity over the visual scene has proven to be an efficient predictor of eye movements. Our work reviews insights into the neurobiological(More)