1. Time delay of electroencephalogram index calculation: analysis of cerebral state, bispectral, and Narcotrend indices using perioperatively recorded electroencephalographic signals 
R. Zanner, S. Pilge, E.F. Kochs, M. Kreuzer, G. Schneider 
British Journal of Anaesthesia 
Volume 103, Issue 3, Pages (September 2009)
DOI: /bja/aep198
Copyright © 2009 British Journal of Anaesthesia Terms and Conditions

2. Fig 1
Full-step approach: a full step from ‘cortical suppression’ to ‘awake’ and back in form of replayed recorded EEG signals was used as input for the monitors. Vertical lines indicate the time point of switching from one input signal to the next. (a) CSI, (b) BIS, and (c) NCT.
British Journal of Anaesthesia  , DOI: ( /bja/aep198)
Copyright © 2009 British Journal of Anaesthesia Terms and Conditions

3. Fig 2
Stepwise approach: a ‘general anaesthesia’ level was added. A stepwise input signal change from ‘cortical suppression’ to ‘general anaesthesia’, then from ‘general anaesthesia’ to ‘awake’ and back was performed. Vertical lines indicate the time point of switching from one input signal to the next. (a) CSI, (b) BIS, and (c) NCT.
British Journal of Anaesthesia  , DOI: ( /bja/aep198)
Copyright © 2009 British Journal of Anaesthesia Terms and Conditions