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

Siddharth Karkare, Goutam Saha, Joydeep Bhattacharya

Research output: Contribution to journalArticlepeer-review

36 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)2067-2073
Number of pages7
JournalChaos, Solitons and Fractals
Issue number4
StatePublished - Nov 30 2009
Externally publishedYes

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Mathematics(all)
  • Physics and Astronomy(all)
  • Applied Mathematics


Dive into the research topics of 'Investigating long-range correlation properties in EEG during complex cognitive tasks'. Together they form a unique fingerprint.

Cite this