TY - JOUR
T1 - Investigating long-range correlation properties in EEG during complex cognitive tasks
AU - Karkare, Siddharth
AU - Saha, Goutam
AU - Bhattacharya, Joydeep
N1 - Funding Information:
This work has been partially supported by CP-STIO Project (GS, JB). and by JST.ERATO Project (JB) We also thank Prof. Hellmuth Petsche for the EEG experiment. Author contributions: JB conceived the research; SK performed the computations under the supervision of GS and JB; JB, SK and GS wrote the paper.
Copyright:
Copyright 2009 Elsevier B.V., All rights reserved.
PY - 2009/11/30
Y1 - 2009/11/30
N2 - Previous work shows the presence of scale invariance and long-range correlations in ongoing and spontaneous activity of large scale brain responses (i.e. EEG), and such scaling behavior can also be modulated by simple sensory stimulus. However, little is known whether such alteration but not destruction in scaling properties also occurs during complex cognitive processing and if neuroplasticity plays any role in mediating such changes. In this study, we addressed these issues by investigating scaling properties of multivariate EEG signals obtained from two broad groups - artists and non-artists - while they performed complex tasks of perception and mental imagery of visual art objects. We found that brain regions showing increased correlation properties from rest were similar for both tasks, suggesting that brain networks responsible for visual perception are reactivated for mental imagery. Further, we observed that the two groups could be differentiated by scaling exponents and an artificial neural network based classifier achieved a classification efficiency of over 80%. These results altogether suggest that specific complex cognitive task demands and task-specific expertise can modify the temporal scale-free dynamics of brain responses.
AB - Previous work shows the presence of scale invariance and long-range correlations in ongoing and spontaneous activity of large scale brain responses (i.e. EEG), and such scaling behavior can also be modulated by simple sensory stimulus. However, little is known whether such alteration but not destruction in scaling properties also occurs during complex cognitive processing and if neuroplasticity plays any role in mediating such changes. In this study, we addressed these issues by investigating scaling properties of multivariate EEG signals obtained from two broad groups - artists and non-artists - while they performed complex tasks of perception and mental imagery of visual art objects. We found that brain regions showing increased correlation properties from rest were similar for both tasks, suggesting that brain networks responsible for visual perception are reactivated for mental imagery. Further, we observed that the two groups could be differentiated by scaling exponents and an artificial neural network based classifier achieved a classification efficiency of over 80%. These results altogether suggest that specific complex cognitive task demands and task-specific expertise can modify the temporal scale-free dynamics of brain responses.
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U2 - 10.1016/j.chaos.2009.03.148
DO - 10.1016/j.chaos.2009.03.148
M3 - Article
AN - SCOPUS:67650995790
SN - 0960-0779
VL - 42
SP - 2067
EP - 2073
JO - Chaos, Solitons and Fractals
JF - Chaos, Solitons and Fractals
IS - 4
ER -