豊橋技術科学大学

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Koida, Kowa

Affiliation Electronics-Inspired Interdisciplinary Research Institute(EIIRIS)
Title Associate professor
Fields of Research Neuroscience
Degree phD
Academic Societies Society for Neuroscience, International color vision society
E-mail koida@eiiris
Please append ".tut.ac.jp" to the end of the address above.
Laboratory website URL http://www.eiiris.tut.ac.jp/koida/
Researcher information URL(researchmap) Researcher information

Research

 視覚認知、特に色と明るさに関する脳と心の働きを理解するために、ヒトを対象とした知覚心理物理実験、ならびにモデル動物(マカクザル)の脳からのニューロン活動記録実験を行なっています。視覚情報が神経情報に変換され、知識によってラベリングされるまでの広い現象を、色覚を手がかりに解き明かしていくことを目的としています。

 実験はエレクトロニクス先端融合研究所のライフサイエンスラボにて集中的に行われています。工学系単科大学では珍しい本格的な動物実験区域です。豊橋技科大で発明された超微細電極「豊橋プローブ」の開発・実証実験や、新規計測技術の探索を学科をまたいたチームとして融合研究を進めています。

Theme1:Understanding neural basis for visual sensation and cognition

Overview
Neurons, spiking activities of neuron and shcematic illustration of the cortex of monkey.

Color is a premier model system for understanding how visual information is processed by neural circuits. Both the physical stimulus for color and the perceptual output experienced as color are quite well characterized, but the neural mechanisms that underlie the transformation from stimulus to perception are incompletely understood.

I am focusing on the inferior temporal cortex (ITC), where many neurons response to visual stimuli as highly selective and sophisticated manner. I found a patch organization of color selective cells in the ITC where clusters of neurons showed strong and fine color responses. To understand higher visual function taking place in the ITC such as effect of task demands, memory and utility, color response in the patch could become a useful target area for single unit recording and electrical microstimulation.

Human psychophysics is carried out to find out new phenomena, visual illusion and critical feature of visual stimuli. Psychophysical measurement is important to supports correlative evidence between animal behavior and human perception.

REFs: Nat Neurosci 10(1): 108-116., J. Neurosci. (2010) 30, p14955-63.

Selected publications and works

Nat Neurosci (2007)10, p108-116.
J. Neurosci. (2010)30, p14955-63.

Keywords

Electrophysiology, Single-unit recording, Electrical microstimulation, behaving animal. Human psychophysics

Theme2:Establishing innovative method for neuroscience

Overview
Picture of a micro-imaging probe with a high density optical fibers.

EIIRIS have a strong advantage for the development of sensing device such as high density electrode with smart electrical circuits and optical devices. The electrode using Vapor-Liquid-Solid techniques (also known as Toyohashi-probe) is now in trial for effective physiological experiments. An optical imaging system using bundle fibers enable us to monitor functional architecture of deep brain. We debelop these techniques using animalas such as mice, rats, and monkeys.

Selected publications and works

http://www.eiiris.tut.ac.jp/probe/

Keywords

Optical imaging, Fiber cuppled microscopy, Multi-electrode depelopment

Theme3:Behavioral study for dichromatic macaque

Overview
Pseudoisochromatic plates example used in the behavioral tests.

Our research groug have found dichromatic macacues a deacade ago, and examined their color vision by genetics (Onishi, et al. 1999), electroretinography (Hanazawa, et al. 2000), and behavioral color discrimination perfromance (Koida, et al. 2013). Futher reseach such as physiological recording in the brain would be expected.

Selected publications and works

J Vis 13(13): 1.(2013)

Keywords

color blind, dichromaticism, macaque monkey

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