A5020047111- Visual perception and processing mechanisms
- Neuroscience and Neural Engineering
- Neural dynamics and brain function
- Color perception and design
- EEG and Brain-Computer Interfaces
- Color Science and Applications
- Photoreceptor and optogenetics research
- Advanced Memory and Neural Computing
- Neurobiology and Insect Physiology Research
- Advanced Sensor and Energy Harvesting Materials
- Retinal Development and Disorders
- Muscle activation and electromyography studies
- Visual Attention and Saliency Detection
- Multisensory perception and integration
- Neural Networks and Applications
- Image Enhancement Techniques
- Animal Behavior and Reproduction
- Categorization, perception, and language
- Memory and Neural Mechanisms
- Optical Imaging and Spectroscopy Techniques
- Advanced Fluorescence Microscopy Techniques
- Surface Roughness and Optical Measurements
- Ophthalmology and Visual Impairment Studies
- Ocular and Laser Science Research
- Impact of Light on Environment and Health
Toyohashi University of Technology
2016-2025
National Institute for Physiological Sciences
2003-2023
Tohoku University
2016
Juntendo University
2016
Nippon Soken (Japan)
2009
Tokyo Institute of Technology
2000-2001
It has been empirically established that the cerebral cortical areas defined by Brodmann one hundred years ago solely on basis of cellular organization are closely correlated to their function, such as sensation, association, and motion. Cytoarchitectonically distinct have different densities types neurons. Thus, signaling patterns may also vary among cytoarchitectonically unique areas. To examine how neuronal related innate functions, we detected intrinsic features firing devising a metric...
An ultrastretchable film device is developed that can follow the shape of spherical and large deformable biological samples such as heart brain tissues. Although composed biocompatible parylene for substrate metal layers platinum (Pt)/titanium (Ti), which are unstretchable materials, shows a high stretchability by patterning slits "Kirigami" design. A Pt/Ti-microelectrode array embedded in 11 µm thick with 5 × 91 exhibits strain ≈250% at 9 mN strain-force (0.08 MPa stress) Young's modulus 23...
The architectonic subdivisions of the brain are believed to be functional modules, each processing parts global functions. Previously, we showed that neurons in different regions operate firing regimes monkeys. It is possible reflect differences underlying information processing, and consequently homologous across animal species might similar. We analyzed neuronal spike trains recorded from behaving mice, rats, cats, regularity differed systematically, with one being greater than similar...
Abstract Dichromacy is a color vision defect in which one of the three cone photoreceptors absent. Individuals with dichromacy are called dichromats (or sometimes “color-blind”), and their discrimination performance has contributed significantly to our understanding vision. Macaque monkeys, normally have trichromatic that nearly identical humans, been used extensively neurophysiological studies In present study we employed two tests, pseudoisochromatic test monochromatic light detection...
Electronic devices used to record biological signals are important in neuroscience, brain-machine interfaces, and medical applications. Placing electronic below the skin surface recording muscle offers accurate robust electromyography (EMG) recordings. The device stretchability flexibility must be similar tissues achieve an intimate integration of with tissues. However, conventional elastomer-based EMG electrodes have a Young's modulus that is ≈20 times higher than muscle. In addition, these...
Abstract Long‐term quantitative observations of the physiological state brain are essential technologies in various fields. In vivo electrophysiology with microelectrodes enables high spatiotemporal recordings neuronal activities; however, tissue damage occurs due to electrode penetration, which limits recording period. A neural technology is introduced that uses a 5‐µm‐diameter microneedle device. The implanted mouse cortex shows capabilities 1 day after implantation, exceeds year‐long...
Earlier studies suggest that the inferior temporal (IT) cortex of monkey plays a key role in color discrimination. Here, we examined quantitative relationship between judgment monkeys and responses color-selective neurons anterior part IT (area TE) by comparing neuronal activity behavior recorded simultaneously while performed color-judgment task. We first compared abilities single to discriminate color. To calculate neuron's ability color, computed neurometric function using...
The spatial luminance relationship between shading patterns and specular highlight is suggested to be a cue for perceptual translucency (Motoyoshi, 2010). Although local image features are also important perception (Fleming & Bulthoff, 2005), they have rarely been investigated. Here, we aimed extract regions related from computer graphics (CG) images of objects using psychophysical reverse-correlation method. From many trials in which the observer compared two CG images, obtained...
Abstract Categorical perception is a ubiquitous function in sensory information processing and reported to have important influences on the recognition of presented and/or memorized stimuli. However, such complex interactions among categorical other aspects not been explained well unified manner. Here, we propose recurrent neural network model process stimuli, which approximately realizes hierarchical Bayesian estimation The accounts for wide variety neurophysiological cognitive phenomena...
Humans are able to categorize an infinite variety of surface colors into a small number color terms. Previous studies have shown that 11 basic terms commonly used in fully developed languages. These usually flat matte plates as stimuli, but we can also perceive the glossy surfaces by discounting effect gloss. However, such GOLD and SILVER specifically associated with surfaces. In this study, conducted categorical color-naming task examine whether could be located stimulus space defined...
Abstract Investigations into mechanisms in various cortical areas can be greatly improved and supported by stable recording of single neuronal activity. In this study, fine silicon wire electrodes (diameter 3 μm, length 160 μm) are fabricated vapor–liquid–solid (VLS) growth with the aim stabilizing reducing invasiveness on measurement procedure. The electrode is a modular 1 × mm 2 conductive block that assembled number different device packages, for example rigid or flexible printed circuit...
Color-vision polymorphism in New World monkeys occurs because of an allelic the single-copy red-green middle-to-long-wavelength-sensitive (M/LWS) opsin gene on X chromosome. Because color-vision types can readily be estimated from M/LWS gene, this polymorphic system offers researchers excellent opportunity to study association between vision and behavior. As a prerequisite for such studies, genetically determined must concordant with phenotypes directly by behavioral criteria (e.g., color...
The capacity for flexible sensory-action association in animals has been related to context-dependent attractor dynamics outside the sensory cortices. Here, we report a line of evidence that flexibly modulated during task switching are already present higher visual cortex macaque monkeys. With nonlinear decoding approach, can extract particular aspect neural population response reflects task-induced emergence bistable population, which could be obscured by standard unsupervised...
Whether a color stimulus appears in the surface-color or aperture-color mode depends on luminance relationship between center and its surround. We investigated how chromaticity of affected level at which appearance changed from to mode. Mode estimation points were obtained for 10-cd/m2 stimuli with different chromaticities presented white surround variable luminance. The tended appear as purity increased, similarly increase brightness-to-luminance ratio equal-luminance colors. It was also...
Well-trained experts in pearl grading have been thought to evaluate pearls according their glossiness, interference color, and shape. However, the characteristics of evaluations are not fully understood. Using experiments, we investigate consistency novice (i.e., without knowledge grading) expert participants' skill then compare novices' with that experts; furthermore, discuss relationship between grading, glossiness. We found was significantly less concordant average than experts' grading;...
It has been argued that when an observer moves, a contingent retinal-image motion of stimulus would strengthen the perceived glossiness. This be attributed to veridical perception three-dimensional structure by parallax. However, it not investigated whether effect parallax is more than stimulus. Using magnitude estimation method, we examine in this paper cross-modal coordination change and observer's (i.e., parallax) essential or alone sufficient for enhancing Our data show simulating...
The glare illusion refers to brightness enhancement and the perception of a self-luminous appearance that occurs when central region is surrounded by luminance gradient. center appears be light source, with its dispersing into surrounding region. If luminous edge critical for generating illusion, modulating perceived image, switching from nonluminous, would have strong impact on lightness estimation. Here, we quantified in two ways, assessing examining whether appeared luminous. Thus, could...
We propose neural recording using a 5 μm-diameter needle electrode device, which enables following the brain's motion. The implanted device in mouse brain showed stable of neuronal signals for 6 months and reduced tissue damage.