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Investigating long-range correlation properties in EEG during complex cognitive tasks

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  • Karkare, Siddharth
  • Saha, Goutam
  • Bhattacharya, Joydeep

Abstract

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.

Suggested Citation

  • Karkare, Siddharth & Saha, Goutam & Bhattacharya, Joydeep, 2009. "Investigating long-range correlation properties in EEG during complex cognitive tasks," Chaos, Solitons & Fractals, Elsevier, vol. 42(4), pages 2067-2073.
    • Handle: RePEc:eee:chsofr:v:42:y:2009:i:4:p:2067-2073
    DOI: 10.1016/j.chaos.2009.03.148
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    References listed on IDEAS

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    1. Conte, Elio & Khrennikov, Andrei & Federici, Antonio & Zbilut, Joseph P., 2009. "Fractal fluctuations and quantum-like chaos in the brain by analysis of variability of brain waves: A new method based on a fractal variance function and random matrix theory: A link with El Naschie f," Chaos, Solitons & Fractals, Elsevier, vol. 41(5), pages 2790-2800.
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    Cited by:

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