Visual Electroencephalogram Group

Visual EEG
Visual EEG - from basic science (mechanism of a brain) to applied technology -


 Progress of electroencephalogram research is remarkable. Gradually, neural function is being elucidated. Our aim is to elucidate operation of the brain and its visual mechanism. We are also challenging on the application of BCI(Brain-Computer Interface).


Basic science - Visual information processing system of brain


 Event-Related Potentials(ERP) is brain surface potential that originates in brain activity caused synchronizing with specific event. Studies on ERP can help us to understand human brain mechanism. In our laboratory, visual information processing system is investigated by measuring ERP during visual task.


Study on the effects of color information on face recognition



 Face perception is important for our social interaction. Our study has been revealed that when we perceive faces, not only face features such as its configuration and contour but also face color, affect our face perception. Also we continue to reveal the effect of the color information on face processing and consider its developmental aspects using tools such as EEG, fMRI, TMS.


[Related Research Papers]
Kongthong N, Minami T, Nakauchi S (2014). Gamma oscillations distinguish mere exposure from other likability effects. Neuropsychologia 2014 Feb;54:129-38. [External Link]
Kongthong, N., Minami, T. and Nakauchi, S.(2013), Semantic processing in subliminal face stimuli: An EEG and tDCS Study, Neuroscience letters, Vol.544 No.7, pp141–146 [External Link]
Nakajima,K.,Minami,T.,M. and Nakauchi,S (2012). The face-selective N170 component is modulated by facial color,Neuropsychologia,Vol.50,pp. 2499-2505 [External Link]
横田悠右,南哲人,中内茂樹 (2011),聴覚-視覚プライミングおよび不自然な視覚刺激が脳波事象関連電位およびガンマ帯振動に与える影響,電子情報通信学会論文誌D, Vol. J94-D, No.9, pp.1579-1588 [External Link]
Minami, T., Goto, K., Kitazaki, M and Nakauchi, S (2011). Effects of color information on face processing using event-related potentials and gamma oscillations, Neuroscience Vol.176, pp. 265-273 [External Link]
横田悠右,南哲人,中内茂樹 (2011),ERP に基づく視覚刺激における不自然さの推定, 日本感性工学会論文誌 Vol.10 No.2 pp.277-286 [External Link]
中島加惠,南哲人,中内茂樹 (2010.02) 記憶色の強さが事象関連電位P3に与える影響 日本感性工学会論文誌 Vol.9 No.2 pp. 235-242 [External Link]
Minami,T.,Goto,K.,Kitazaki,M. and Nakauchi,S (2009). Asymmetry of P3 amplitude during oddball tasks reflects the unnaturalness of visual stimuli,NeuroReport,Vol.20,pp. 1471-1476 [External Link]
後藤紀美子,南哲人,北崎充晃,中内茂樹 (2009) 顔認知処理に与える色情報の影響と時間特性 日本感性工学会論文集 Vol.8 No.3 pp. 527-534 [External Link]

K Nakajima, T Minami, S Nakauchi - Scientific reports, (2017), Interaction between facial expression and color, Scientific reports, vol.7 [External Link]


Study on the effects of irrelevant information gives in emotional judgment to object



 When we do shopping in supermarkets, we tend to think we understand the information of the product correctly and choose it. In fact, product judgment or evaluation may be performed by the information which is completely unrelated. For example, when you feel the coffee in caf? is delicious. This might due to the good weather of that day, or the good atmosphere of the store. This is called emotion misattribution effect. In this study, we investigated the relations between cognitive processing and emotion processing by measuring the brain activity when the misattribution of emotion occurring.


Study on the effects in brain acitivity by difference of driving skill



 Decreasing in driving skill by age is a very important issue in modern society. When we divided the type of car driving accident by driver’s age, It is shown that the proportion of crossing collision is increased with driver’s age. In recent study, It is suggested that UFOV ( Useful Field Of View ) is correlated with driving skill. In addition, the difference of brain activity by aging is studied all over the world. Therefore, We study the effect appeared in brain activity by difference of driving skill by using older and younger adults participants.


Basic science – Investigation of recognition mechanism : analysis of eye movement


 Studies on the pupil showed that our pupil size reflects our emotional conditions when we look at visual stimulus. In our laboratory, human recognition mechanism is investigated by measuring the eye movement during visual task.



Applied technology - apply to BCI and decoding of brain activity



 Development of electroencephalogram research is remarkable. Old researches were mostly about investigation of signal changes from brain activities. But now, researches on mind reading from the measured brain activity signal is active at home and abroad. We under go experiments using the electroencephalograph to study about how to extract high order cognitive activity and information from the measured EEG data.

Keyword:EEG,BCI (Brain Computer Interface), Brain activity decoding,machine learning

[Collaboration Research]
Toyohashi University of Technology Kitazaki Laboratory [External Link]
・Toyohashi University of Technology GCOE

Related Research Papers]
高井英明,南哲人,長谷川良平 (2011),P300に基づく認知型BMIにおける効率の良い刺激提示方法の検討, 日本感性工学会論文誌 Vol.10 No.2 pp.89-94 [External Link]




 Neuromarketing which involves analysis of customer's unconsciousness responses to commodity and advertisement from their brain activity has gained more attention today. In this study, we analyzed electroencephalogram (EEG) which was recorded while the subjects evaluated familiarity of commodity characters. We focused on the difference of the EEGs caused by the subjects’ responses (KNOWN or UNKNONN) of the characters.


[Collaboration Research]
AIST (National Institute of Advanced Industrial Science and Technology) [External Link]

Related Research Papers]
Hashimoto, Y., Minami, T. and Nakauchi, S (2012), Electrophysiological differences in the processing of affect misattribution, PLoS ONE 7(11): e49132 [External Link]
橋本陽平,南哲人,長谷川良平,中内茂樹(2011),商品キャラクタに対する認知状態と脳波の関連 日本感性工学会論文誌 Vol.10 No.2 [External Link]


Detection of intelligibility about visual information(2008〜)


 Do you recognize what the image above (binarization image) is? Try moving your mouse cursor above the image, it will automatically switch to color image. Again, remove your mouse cursor from the image. Now, you must have come to understand clearly what the image is compared to when you first looked at the binarization image. Here, we make a hypothesis that your recognition states. That is, ambiguous or clear. And, recent researches revealed that the EEG component caused by flickering image, which is called steady state visually evoked potential (SSVEP), might be a potential index for object recognition. Our research aim to discriminate whether a person recognizes an object or not using SSVEP.

[Related Research Papers]
Minami T, Noritake Y, Nakauchi S (2014). Decreased beta-band activity is correlated with disambiguation of hidden figures. Neuropsychologia, in press. [External Link]
則竹洋介,南哲人,中内茂樹 (2011),単一試行に対するEEGを用いた2値化された隠し絵の知覚状態推定、電子情報通信学会論文誌D, Vol.J94-D, No.7, pp.1145-1153 [External Link]



Previous Researches

Previous Researches