COST B27 Working Group 3 MK national report Georgi Stojanov Faculty of Electrical Engineering University of SS Cyril and Methodius in Skopje, Macedonia

COST B27Working Group 3 MKnational report

Georgi Stojanov

Faculty of Electrical EngineeringUniversity of SS Cyril and Methodius in Skopje, Macedonia

WG3 COST B27 MK national report, Istanbul, September 3. 2005

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PREVIOUS EXPERIENCE CNV and DCNV extraction and recognition EEG controlled devices

ONGOING RESEARCH representation of knowledge of the

environment in autonomous agents Behavior of human subjects in simple virtual

environments WG3 MK ROLE IN COST B27


Contingent Negative Variation (CNV)

s1 s2

reaction

record EEG

subject

Experimental setup for the CNV experiments


Contingent Negative Variation (CNV)

Typical CNV wave recorded from Cz electrode. By convention negative EEG values are up


CNV extraction using classical averaging

trials time

S1 S2


DYNAMIC CNV EXPERIMENTAL SETUP (DCNV)

subject

s1

reaction

record EEG

if i(cnv)>t and s2 then s2:=Fif i(cnv)<t and ~s2 then s2:=T


DYNAMIC CNV EXPERIMENTAL SETUP (DCNV)


EXTRACTION OF CNV WAVE DURING CLASSIC AND DCNV SETUP

( ) ( ) ( ) ( ) ( )

_

( )

_

n n

i

ni

ni

n nf f s n s nE E

( )

_

nn 0

( ) ( )

_

n nf s

_

( )( )n ps f

n

i

i

p

1

1

^

( ) ( ) ( )( ) , ...n Hs f f fn

1 2 1

^

( ) ( )( )ns h fii

n

n i

1

( ) ( ) ( )

^ ^k k ks c s d f

1

…….

)()(

ikfcoi

i

k ds

CNV DCNV


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Behavior of human subjects in simple simulated environment










EXPERIMENTAL RESULTSVISUAL AND AUDITORY STIMULI

(8 subjects grand average)

y = -31,777x + 488,74 r2=0.84

0

200

400

600

1 2 3 4 5 6 7 8 9 10 11 12 13TIMES THE GOAL WAS REACHED

VISUAL STIMULI ONLY(8 subjects grand average)

y = -13,333x + 584,6 r2=0.68

0200400600800

1 2 3 4 5 6 7 8 9 10 11TIMES THE GOAL WAS REACHED

AUDITORY STIMULI ONLY (7 subjects grand average)

y = -23,97x + 426,44 r2=0.68

0

200

400

600

1 2 3 4 5 6 7 8 9 10 11 12 13 14TIMES THE GOAL WAS REACHED

learning was much faster for compound stimuli (slope= -31.8) than only auditory (slope= -23.0) or only visual (slope= -13.3) stimuli. The compound versus simple percept discrepancy was predicted by the model.


AUDITORY STIMULI ONLY


y = -23,97x + 426,44 r2=0.68

0

200

400

600





y = -31,777x + 488,74 r2=0.84

0

200

400

600



y = -13,333x + 584,6 r2=0.68

0200400600800



y = -23,97x + 426,44 r2=0.68

0

200

400

600




VISUAL STIMULI ONLY


y = -13,333x + 584,6 r2=0.68

0200400600800





y = -31,777x + 488,74 r2=0.84

0

200

400

600



y = -13,333x + 584,6 r2=0.68

0200400600800



y = -23,97x + 426,44 r2=0.68

0

200

400

600




VISUAL AND AUDITORY STIMULI

VISUAL AND AUDITORY STIMULI(8 subjects grand average)

y = -31,777x + 488,74 r2=0.84

0

200

400

600



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EEG CONTROLED DEVICES

VISUAL FEEDBACK

RADIO CONTROL


SELECTED PUBLICATIONSStojanov, G., Bozinovski, S., Bozinovska, L., “AV Control System Which Makes Use of Environment Stabilizations”, SPIE Conference on Mobile Robot and Automated Vehicle Control, Boston, 1996.Stojanov, G., Bozinovska, L, Bozinovski, S., “Optimal Linear

Estimator for CNV Wave During the Dynamic CNV Paradigm Experiments”, 11th ISBE, Zagreb, 1996a.Bozinovska, L., Sestakov, M. Stojanov, G., Bozinovski, S.,

“Change in the CNV wave Intensity during bio-feedback Training with Personal Computer”, (in Serbo-Croatian),

Neurologija, Supl.2., 1988.Sestakov, M, “Digital Processing of Preparatory and Evoked Bio-

electric Sygnals” (in Macedonian), M.Sc. Thesis, ETF, University in Skopje, 1988Bozinovska, L., Bozinovski, S., Stojanov, G., “Electroexpectogram: Experimental Design and Algortithms”, IEEE Biomedical Days, Istambul, 1992.


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environments WG3 ROLE IN COST B27


WG3 ROLE IN COST B27

• participation in devising new experimental set-ups meant to invoke particular perceptual, memory/learning processes in human subjects; • participation in adaptation and development of new algorithms for EEG FTS patterns analysis; • development of a generic computational model of a system which comprises multitude of mutually affecting oscillators (in collaboration with WG1), and • modelling the observed phenomena

Documents

COST B27 Working Group 3 MK national report Georgi Stojanov Faculty of Electrical Engineering University of SS Cyril and Methodius in Skopje, Macedonia