Table 2.

Distribution of pars opercularis asymmetries in chimpanzees and humans

	#L	#A	#R	AQ	s.e.	%Leftward
Surface Volume
(C)Cantalupo & Hopkins72	20	1	6	−.179	.070	8.97
(C)Hopkins et al.73	20	2	9	−.074	.040	4.78
(C)Cantalupo et al.74	35	7	27	−.079	.047	3.96
(C)Cantalupo et al.74	30	3	40	.029	.035	−1.42
(H)Foundas et al.76	12	9	11	NA	NA	NA
(H)Foundas et al.75	NA	NA	NA	-0.082	0.035	NA
Gray Matter Volume
(C)Cantalupo et al.74	32	6	31	−.057	.044	.045
(C)Cantalupo et al.74	28	6	31	.051	.033	−.039
(C)Keller et al.71	12	0	18	−.021	.139	−2.62
(H) Knaus et al.70
(H)Keller et al.14	31	2	17	NA	NA	NA
(H)Keller et al.11	14	0	16	−.015	.112	−1.13
(H)Tomaiuolo et al.15	17	4	29	.084	.074	NA

(C) = chimpanzee, (H) = humans, #L = number left, #A = number ambiguous, #R = number right, AQ = asymmetry quotient, s.e. = standard error, %Leftward = percentage larger left hemisphere, NA = data not available