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Schedule in July 2015


The 22nd Perceptual Frontier Seminar: Patterns in Mind

Date and time: Friday, 31 July 2015, from 13:00-14:30
Venue: Room 601, 6th floor, Build. 3, Ohashi Campus, Kyushu University
How to get to Ohashi Campus: <http://www.design.kyushu-u.ac.jp/kyushu-u/english/access>
Location of the Build. 3 in the Campus: <http://www.design.kyushu-u.ac.jp/kyushu-u/english/about/campusmap>
Organizer: Yoshitaka NAKAJIMA (Kyushu University/ReCAPS)

Program

1. On the contribution of power-fluctuation factors to speech intelligibility
Takuya KISHIDA*, Yoshitaka NAKAJIMA**, Kazuo UEDA**, and Gerard B. REMIJN**
*Graduate School of Design, Kyushu University **Dept. Human Science/Research Center for Applied Perceptual Science, Kyushu University

The present study investigated how power-fluctuation factors extracted from speech signals, represented as 20 power fluctuations incritical-band filters, contribute to speech intelligibility. Nine native Japanese speakers listened to speech-like stimuli resynthesized from the extracted factors, and answered Japanese morae (syllable-like units) they perceived. When the number of factors changed from two to three, their identification performance leaped from 5.4% to 79.6%. This suggests that the first three power-fluctuation factors are critical for speech intelligibility.

2. Neuromagnetic account of how the human brain decides the equality of two intervals
Takako MITSUDO*
*Kyushu University

Magnetoenchephalography experiment using unique perceptual phenomenon, Auditory temporal assimilation, revealed that two distinct brain regions are involved in cognitive time management. The right temporo-parietal junction was activated when participants attended to the time intervals to be encoded. The right inferior frontal gyrus was activated when participants compared and decided the equality/inequality of two adjacent empty time intervals. These processes completed immediately after the stimulus presentation.

3. Integration of touch and vision in children, studied with child MEG
Gerard B. Remijn*, Mitsuru Kikuchi**, Kiyomi Shitamichi**, Sanae Ueno**, Yuko Yoshimura***, Kikuko Nagao+, Tsunehisa Tsubokawa**, Haruyuki Kojima**, Haruhiro Higashida**, and Yoshio Minabe**
*Kyushu University, **Kanazawa University, ***Kanazawa University and Osaka University, +Osaka University

We will describe an experiment in which somatosensory evoked field (SEF) was obtained from 3- to 4-year-old children in response to tactile-only and visuotactile stimuli. The data were obtained with the use of child-customsized magneto-encephalography (MEG) equipment. SEF data from preschool children to tactile-only stimuli have been described in only a few articles so far, and, to our knowledge, the present study is the first to describe preschool SEF in response to visuotactile stimuli. The major deflections in the MEG waveform in terms of latencies and source strengths will be described. We first show that the preschool children who participated in the experiment mainly provided an anteriorly-directed M60 as a first major deflection in the waveform---different from an adult-like M50. The second major deflection in the waveform, the M100, was subject to modulatory effects of visual information. This shows that already at preschool age, somatosensory evoked field reflects intermodal connectivity.

Reference: Remijn, G.B. et al. (2014). Somatosensory evoked field in response to visuotactile stimulation in 3- to 4-year-old children. Frontiers in Human Neuroscience, 8, 170.

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