Wave energy for event-related potentials

s273

605

WAVE ENERGY FOR EVENT-RELATED

ICHIRO SHIMOYAMA,

Dept. of Physiology,

TOSHIHIKO

Sch. of Medicine,

ITO, TADAHIKO

POTENTIALS

SHIBATA,

considered

as normalization

with a contextual

energy for auditory contextual sentences,

EVENT-RELATED FOREIGN

showed significantly

of Physiology,

The neurophysiological

(ERPs).

Wave energy could analyze

POTENTIALS

site, were

Auditory ERPs were recorded to study the sentences

and analyzed for post-stimulus

difference

at the terminal The

1024 ms.

between the incong.ruent and congruent

higher energy than that of the right hemisphere.

(ERPs) FOR WORDS RECOGNITION

AS EITHER MOTHER

OR

LANGUAGE

DILSHAT ABLA, YOSHIO NAKAJIMA Department

were normalized

process showed significant

and the left hemisphere

606

potentials

activities, peculiar to each recording

decision task using congruent and incongruent

Wave energy, mean square potentials,

words.

Background

as a whole.

with the energy just before the stimuli.

energy for eight volunteers

YOSHIO NAKAJIMA

Chiba Univ., 260-8670

Wave energy has not been reported for study of the event-related both negative and positive potentials

ABLA DILSHAT,

ICHIRO SHIMOYAMA, TOSHIHIKO IT0 and TADAHIKO

SHIBATA

School of Medicine, Chiba University, Chiba 260-8670, Japan

and the neurolinguistic

basis of multilingualism

is not yet fi~lly elucidated. ERPs were recorded in

silent reading of Japanese (Kanji) and English words as either mother (ML) or foreign languages (FL) from 8 volunteers. Twenty Kanji with two characters or 20 English words with 5-letter were randomly displayed on a TV-monitor for 50 ms 21-ch ERPs were recorded with a non-cephalic reference and a band-pass filter of 0.0560Hz.

at random intervals 3 to 4 s.

ERPs were averaged 120 times and ERPs between 200 and 300 ms after stimulus onset were analyzed using ANOVA. Grand average showed negative potentials between 200 and 300 ms over the left mid-posterior temporal, parietal areas for ML and FL.

The results suggest that

The amplitude of the negative potential elicited by FL was the largest(P
on words recognition as either ML and FL, the left mid-posterior temporal and parietal areas might activate around 200More generally, these results provide neurophysiologkal

300ms after stimulus.

support for the process discriminating

ML from FL recognition.

607 KEN’ICHI KONDOU

DETERMINATION OF CURRENT SOURCE CALCULATION AND MEMORY RECALL MATSUNAMI. ‘, TAKE0

Inst. Equilibrium

SABUROU

HONMA.

SITES

Res. and 1) Neurosurgery.

Dipole tracing is the method to estimate

:\CTIVATED

XIAO YAN HAN. HUDA KADRL’L.

on the scalp. Recently

Gifu Univ. School of Med.. Tsukasamachi Yanagido

three dimensionally

structure

head model. and hence it is named as the SSBiDT method. EEG activation

with a distinct

more inno\,ated

IKKI DEGUCHI’.

set after EEG activation. were summed and averaged

shape \\as investigated.

With using this mental sweating to distinguish.

DAISCIKE

as a triggering

From the a\,eraged spike-like

limbic area and the right parietal lobe. Calculation of the subjects

\\ith

a three lager

during and after mental calculation

signal. several

areas.

the number

involving

and

appears on glabrous skin. 4-j small spike-like

waves in EIIG

waves. the SSBiD7‘ method estimated

sources in the left temporal

Because

and 2) Dept. Information

Using this method. the current sources of a small

which appeared

places

in those respective

40.

version of this system was de\xzloped.

recall (mental stress). When mental stress was loaded to a subject. mental sweating

results.

MENTj\L

current sources in the brain from EEti \\aaves recorded

electrodes

conclusive

BY

I. Gifu City. Japan.

multiple

memory

EEG

OJIKA’

Technol.. Gifu Univ. School of Engineering.

spike-like

OF

their current

and mental recall activated slightI> different

is still small.

further study is needed

to gi,e

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