Chewing-gum flavor affects measures of global complexity of multichannel EEG

Yagyu, T.; Wackermann, J.; Kinoshita, T.; Hirota, T.; Kochi, K.; Kondakor, I.; König, Thomas; Lehmann, D. (1997). Chewing-gum flavor affects measures of global complexity of multichannel EEG. Neuropsychobiology, 35(1), pp. 46-50. Karger 10.1159/000119329

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Global complexity of spontaneous brain electric activity was studied before and after chewing gum without flavor and with 2 different flavors. One-minute, 19-channel, eyes-closed electroencephalograms (EEG) were recorded from 20 healthy males before and after using 3 types of chewing gum: regular gum containing sugar and aromatic additives, gum containing 200 mg theanine (a constituent of Japanese green tea), and gum base (no sugar, no aromatic additives); each was chewed for 5 min in randomized sequence. Brain electric activity was assessed through Global Omega (Ω)-Complexity and Global Dimensional Complexity (GDC), quantitative measures of complexity of the trajectory of EEG map series in state space; their differences from pre-chewing data were compared across gum-chewing conditions. Friedman Anova (p < 0.043) showed that effects on Ω-Complexity differed significantly between conditions and differences were maximal between gum base and theanine gum. No differences were found using GDC. Global Omega-Complexity appears to be a sensitive measure for subtle, central effects of chewing gum with and without flavor.

Item Type:

Journal Article (Original Article)


04 Faculty of Medicine > University Psychiatric Services > University Hospital of Psychiatry and Psychotherapy > Psychiatric Neurophysiology [discontinued]

UniBE Contributor:

König, Thomas


600 Technology > 610 Medicine & health








Thomas König

Date Deposited:

14 Aug 2014 16:14

Last Modified:

05 Dec 2022 14:27

Publisher DOI:


PubMed ID:


Uncontrolled Keywords:

Global Omega-Complexity, Global Dimensional Complexity, Brain electric field maps, Electroencephalography, Gum chewing, Taste, Smell,Brain functional state, State space trajectory, Theanine




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