Multiple gamma oscillations in the brain: A new strategy to differentiate functional correlates and P300 dynamics

Başar E., Tülay E., GÜNTEKİN B.

International Journal of Psychophysiology, vol.95, no.3, pp.406-420, 2015 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 95 Issue: 3
  • Publication Date: 2015
  • Doi Number: 10.1016/j.ijpsycho.2015.01.013
  • Journal Name: International Journal of Psychophysiology
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Social Sciences Citation Index (SSCI), Scopus
  • Page Numbers: pp.406-420
  • Keywords: EEG, Event related oscillations, Gamma, P300, ITC, ERSP
  • Istanbul Medipol University Affiliated: Yes


Brain oscillations in the gamma frequency band, - i.e. oscillations greater than 25. Hz - have attracted increasing attention over the last few decades in the research of sensory-cognitive processes. In the neuroscience research literature, a great number of reports aim to describe the functional correlates of oscillatory responses in the gamma frequency window. However, analysis using a broadband frequency window often leads to divergent functional interpretations and controversies.In order to provide a more exact approach, we have used a strategy by defining multiple frequency and multiple time windows according to the combined analysis of conventional power spectral windows, frequency adaptive multiple filters, and inter-trial coherence. The analysis in frequency windows of 25-30. Hz, 30-35. Hz, and 40-48. Hz enables the investigator to provide a distinction of cognitive and/or sensory responses. Moreover, according to topological differentiation and the consideration of neuroanatomic pathways, more reliable interpretations of gamma responses are reached.