Cognitive Behavior Evaluation Based on Physiological Parameters among Young Healthy Subjects with Yoga as Intervention

Table 4

EEG band ratios and their physiological/cognitive activity index interpretation.

EEG band ratios	Activity/correlation	Sources
θ/α	Heart rate (HR)	[23]
α/θ	Performance enhancement index or “wellbeing”	[24]
β/α	Arousal index	[25]
β/θ	Neural activity	[25]
β/(α + θ)	Cognitive performance and attentional resource index	[26]
θ(frontal)/α(parietal)	Task load index	[27]
(δ + θ)/α	Executive load index	[28]
α/δ	Brain perfusion	[29]
θ/β	CNS arousal	[30]
(θ + δ)/(α + β)	Sum of LF to HF ratio	[29]
α/β	Desynchronization	[31]
δ/θ	Synchronization
(θ + α)/β	Vigilance index	[31]