Kyushu University Academic Staff Educational and Research Activities Database
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Shuji Mori Last modified date:2020.01.27

Graduate School
Undergraduate School

HP in Japanese .
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JSPS Grain-in Aid for Scientific Research (A): Investigating common properties of across-channel processing in space, time, and speech perception .
Academic Degree
Ph.D. in Psychology
Country of degree conferring institution (Overseas)
Field of Specialization
cognitive science, cognitive psychology, psychophysics, auditory science
Total Priod of education and research career in the foreign country
Outline Activities
Research: Psychophysical approach to human cognitive processing
Ongoing research topics include
* Between-channel processing of perception of time, space, and speech
Education: Graduate courses titled Cognitive Science, Psychophysics, Kansei Science, Informatics Exercise, Informatics Advanced Study I and II, Cognition and Behavior Advanced Study, undergraduate courses titled Introduction to Electrical Engineering and Information Science I, Data Analysis and Experimental Design
Organized 23rd Annual Meeting of International Society for Psychophysics (October 2007), and The 11th Joint Workshop on Machine Perception and Robotics (November, 2015)
Chief Researcher of JSPS Grand-in Aid Type (A) "Between-channel processing of perception of time, space and speech" (fiscal years of 2013 to 2017)
Research Interests
  • Auditory temporal resolution
    keyword : Auditory Perception, Temporal Processing, Auditory Brainstem Response, Magnetoencephalography
    2018.04Across-frequency gap detection Our auditory system is good at detection a silent gap in otherwise continuous sounds. However, such gap detection deteriorates when the gap is inserted at the point of frequency change in the sound. This is called across-frequency gap detection, and we are now investigating its underlying mechanism by psychophysical experiments, measurement of brain activity, and simulations of cochlear functions..
  • Between-channel processing of perception of time, space, and speech
    keyword : Auditory Perception, Channel, Time, Space, Speech
    2013.04~2018.03Across-frequency gap detection Our auditory system is good at detection a silent gap in otherwise continuous sounds. However, such gap detection deteriorates when the gap is inserted at the point of frequency change in the sound. This is called across-frequency gap detection, and we are now investigating its underlying mechanism by psychophysical experiments, measurement of brain activity, and simulations of cochlear functions..
  • Psychophysics of Japanese reading
    keyword : Japanese, reading, letter recognition
    2008.04~2015.03Psychophysics of Japanese reading This research investigate stimulus factors (letter size, contrast, etc.) and individual factors (age, native language, etc) that possibly affect reading and letter recognition of Japanese by psychophysical experiments..
  • Sport psychophysics
    keyword : sport, psychophysics, anticipation, reaction time, induced motion
    2001.01~2015.03Sport psychophysics Sport psychophysics is a branch of psychophysics that study perceptual and cognitive abilities specific to athletes, i.e. expertise perception, by psychophysical measurement methods. Our initial research focused on karate athletes, measuring their reaction times, expectation, and eye movements. The results show that these measures are quite different between karate athletes and non-athletes (Mori et al., 2002, Human Movement Science; Seya & Mori, Visual Cognition, in press). We are now studying expertise perception of penalty kicks in soccer, side-by-side steps in Rugby, and tennis forhand strokes, using video-filmed motions of the athletes, and point-light displays (biological motion) and computer graphics coverted from the motions..
  • Reaction time and arousal level during automobile driving
    keyword : driving, reaction time, arousal level
    2007.04~2012.03Reaction time and arousal level during automobile driving Reaction times to external stimuli during automobile driving, and driver's arousal level are closely related to occurence of automobile accindents. In order to predict probability of collision during automobile driving and promote safety driving, we are now investigating driver's reaction times and arousal level under simulated driving situations..
  • Auditory search in frequency and intensity
    keyword : audition, search, frequency, intensity, tonal sequence
    2001.04~2006.03Auditory search in frequency and intensity To understand perception and attention of sounds in the temporal dimension, we study auditory search performance for a target in tonal sequence. Search is easier as the target and non-targets are increasing different in frequency, which is modelled in terms of attention band (Mori & Wong, 2004, Journal of Physiological Anthropology and Applied Human Science). However, the model does not fit intensity effects on search, and we are now working on new models..
  • Reference frame for human orientation processing
    keyword : orientation processing, reference frame, visual search, rod-frame illusion, orientation contrast
    2001.01~2004.01Reference frame for human orientation processing Human vision is quite sensitive to orientation difference, while such orientation sensitivity is greatly modulated by a reference frame. This research investigated effects of reference frame on orientation processing in visual search experiments. The results showed that three mechanisms contribute to the effects, namely distraction by frame components, orientation contrast, and interference in local orientation processing (for details, Mori & Kataoka, 2004, Perception & Psychophysics)..
Current and Past Project
  • We investigate mechanisms of across-channel processing in audition, in JSPS grant (Kaken A).
  • A a part of joint research with Rion Co.Ltd, we aim to find methodologies to objectively estimate human auditory temporal resolution.
Academic Activities
1. Cognitive Science Dictionary (2002). Japanese Cognitive Science Society (ed.) Authored items: Method of adjustment, Method of limit, Up-and-down method, Method of constant stimuli, Psychometric function, Probit method, Magnitude estimation, Stimulus uncertainty, Attentional deficit of schizophrenic patients. Tokyo: Kyoritsu Shuppan. (in Japanese).
2. Mori, S. (2005). Applying Basic Research. In M. Naka (ed.), New approach of Cognitive Psychology, Ch.7 (pp.153-178). Tokyo: Seishinshobo Publishers. (in Japanese).
3. Mori, S., Miyaoka, T., & Wong, W., Fechner Day '07: Proceedings of International Society for Psychophysics, International Society for Psychophysics, 2007.10, 筆頭著者の森が大会委員長となって2007年10月20日から23日に東京で開催した第23回国際心理物理学会年次大会の発表原稿集である。序言、目次に続いて、招待講演、テーマセッション、口頭発表、ポスター発表の原稿(4若しくは6ページ)から成る。.
4. Takahiro Yoshioka, Shuji Mori, Yuji Matsuki, Osamu Uekusa, Stochastic changes in driver reaction time with arousal state. In L. Dorn & M. Sullman (Eds.) Advances in Traffic Psychology, Ashgate Publishing Ltd., 2012.05.
1. Seya, Y., Mori, S., Spatial attention and reaction times during smooth pursuit eye movement, Attention, Perception, & Psychophysics, 10.3758/s13414-011-0247-y, 74, 493-509, 2012.03.
2. Wataru Teramoto, kousuke Tao, Kaoru Sekiyama, Shuji Mori, Reading performance in middle-aged adults with declned accommodation, Attention, Perception, & Psychophysics, 74, 1722-1731, 2012.12.
3. Shuji Mori, Takuro Shimada, Expert anticipation from deceptive action, Attention, Perception, & Psychophysics, 10.3758/s13414-013-0435-z, 75, 751-770, 2013.06.
4. Takako Mitsudo, Naruhito Hironaga, Shuji Mori, Cortical activity associated with the detection of temporal gaps in tones: a magnetoencephalography study, Frontiers in Human Neuroscience, doi: 10.3389/fnhum.2014.00763, 8, 1-11, 2014.09, [URL], In this study, spatio-temporal profiles of brain responses to gaps in tones were investigated by two experiments using magnetoencephalography (MEG). Stimuli were consisted of leading and trailing markers with gaps between the two markers of 0, 30, or 80 ms. The leading and trailing markers were 300 ms pure tones at 800 or 3200 Hz. Two conditions were examined: the within-frequency (WF) condition in which the leading and trailing markers had identical frequencies, and the between-frequency (BF) condition in which they had different frequencies. Using minimum-norm estimates (MNE), we localized the source activations at the time of the peak response to the trailing markers. The results revealed that MEG signals in response to 800 and 3200 Hz tones were localized in different regions within the auditory cortex, which indicates spatial representation of frequency pathways of two markers in terms of tonotopic organization. The time course of regional activity (RA) was extracted from each localized region for each condition. In Experiment 1, N1m amplitude of the trailing marker in WF differed between gap durations but not frequency, while in BF conditions, N1m amplitude differed for trailing marker frequency. In Experiment 2, both WF and BF amplitudes showed an effect of frequency, but not gap duration. RAs showed the difference of the temporal characteristics between WF and BF conditions. .
5. Yasuhiro Seya, Shuji Mori, Tradeoff between manual response speed and pursuit accuracy revealed by a deadline procedure.
, Experimental Brain Research, 0.1007/s00221-015-4256-2, 233, 1845-1854, 2015.06.
6. Shuji Mori, Kazuki Oyama, Yousuke Kikuchi, Takako Mitsudo, Nobuyuki Hirose, Between-frequency and between-ear gap detection and their relation to perception of stop consonants, Ear & Hearing, 10.1097/AUD.0000000000000136, 2015.07.
7. Shuji Mori, Yousuke Kikuchi, Nobuyuki Hirose, Hugo Lepage, Willy Wong, Auditory gap detection: psychometric functions and insights into the underlying neural activity, Biological Cybernetics,, 112, 6, 575-584, 2018.10, The detection of a silent interval or gap provides important insight into temporal processing by the auditory system. Previous research has uncovered a multitude of empirical findings leaving the mechanism of gap detection poorly understood and key issues unresolved. Here, we expand the findings by measuring psychometric functions for a number of conditions including both across-frequency and across-intensity gap detection as a first study of its kind. A model is presented which not only accounts for our findings in a quantitative manner, but also helps frame the body of work on auditory gap research. The model is based on the peripheral response and postulates that the identification of gap requires the detection of activity associated with silence..
1. Shuji Mori, Perception, anticipation, and deception in sports, 2012 Concluding Symposium of Perception and Action Project, 2012.08.
2. Takako Mitsudo, Naruhito Hironaga, Shuji Mori, Neuromagnetic correlates of temporal gap detection in human auditory cortex, The 9th Joint Workshop on Machine, Perception and Robotics (MPR2013), 2013.10.
3. Yousuke Kikuchi, Shuji Mori, Nobuyuki Hirose, Binaural temporal fusion shifts perceptual boundary of stop consonants, The 54th Annual Meeting of the Psychonomic Society, 2013.11.
4. Hitomi Kondo, Shuji Mori, Takako Mitsudo, Does brainstem categorize speech? Study of ABR to voiced and unvoiced consonants, 56th Annual Meeting of Psychonomic Society, 2015.11.
5. Shuji Mori, What underlies across-channel gap detection:Overview, 5th Joint Meeting of Acoustical Society of America and Acoustical Society of Japan, 2016.12.
6. Nobuyuki Hirose, Yuzuru Okuda, Shuji Mori, Across-frequency impairment in seeing a temporal gap, European Association for Vision and Eye Research (EVER) 20th Annual Meeting, 2017.09.
Membership in Academic Society
  • Japanese Psychological Association
  • Vision Society of Japan
  • Acoustical Society of Japan
  • Psychonomic Society
Educational Activities
Graduate courses: Psychophysics, Introduction to Kansei science at School of Integrated Frontier Science; Cognitive science, Informatics 1/2/3, Informatics study, Informatics Advanced Study I and II, Cognition and Behavior Advanced Study at School of Electrical Engineering and Information Science
Undergraduate courses: Introduction to Electrical Information Engineering, Data Analysis and Experimental Design, Electrical and Information Engineering Graduate Thesis
Other Educational Activities
  • 2007.01, Member of Ph.D. University Defense Committee of Graduate School of Science, Tokyo Metropolitan Unviersity.
  • 2007.07, JSPS Summer Program Host (Visited student: Sheena Luu, University of Toronto).
Professional and Outreach Activities
2006 Tokyo Metropolitan University 'Open University` lecture.