ID		Artifacts					Artifact Type

kb_a		Jaw tensing 				Isometric contractions 
kb_db		Biting					Continuous movements
kc_db		Teeth grinding				Continuous movements 
sr_a		Frowning					Isometric contractions 
sh_a		Eyebrows raising and holding 		Isometric contractions
shr_db	Eyebrows up and down			Continuous movements 
kl_a		Head turning left and holding		Isometric contractions 
kr_a		Head turning right and holding	Isometric contractions 
klr_db	Head turning left and right		Continuous movements 
ks_a		Head tilting downwards and holding	Isometric contractions 
kh_a		Head tilting upwards and holding 	Isometric contractions 
kn_db		Nodding 					Continuous movements