Table 2. Comparison of the responses to simple stimuli and calls in each of the cortical areas.

Area	S		AI		VRB			VCB		DC		DRB			T		DCB
Number tested Total = 651	62	83		84			47		72		110			72		121
Click (n)	50	59		57			41		61		99			65		94
%	81	71		68			87		85		90			90		78
Noise (n)	55	62		51			32		65		50			66		93
%	89	75		61			68		90		45			92		77
Pure tone (n)	60	71		73			5		67		65			56		85
%	97	86		87			11		93		59			78		70
Calls (n)	48	67		77			42		49		27			57		94
%	77	81		92			89		68		25			79		78
Proportions of cells responsive to communication calls in each cortical area compared with simple stimuli
Area	S	AI				VRB	VCB		DC		DRB		T			DCB
Noise						**	**		##		#
Click						**			#		##
Tone	##						**		##		##

Fishers exact test compares the proportions of cells responsive to communication calls in each cortical area with the proportions that responded to simple stimuli (*more responsive to calls at the p<0.05 level, **more responsive to calls at the p<0.001 level, # less responsive to calls at the p<0.05 level, ## less responsive to calls at the p<0.001 level).