Table 4.

Probabilities for Tukey HSD post hoc tests of TH-ir axon length density. Differences of layers are reported between cortical regions for each species.

Species	Layer	Area 9 – Area 32	Area 9 – Area 4	Area 32 – Area 4
Macaca maura	I	0.00* (9)	0.06	0.00* (4)
	II	0.00* (9)	0.97	0.00* (4)
	III	0.64	0.03* (4)	0.00* (4)
	V/VI	0.14	0.88	0.00* (4)
Pan troglodytes	I	0.57	0.14	0.00* (4)
	II	0.99	0.96	1.00
	III	0.54	1.00	0.99
	V/VI	0.92	1.00	0.98
Homo sapiens	I	0.04* (32)	0.03* (4)	1.00
	II	0.70	1.00	0.89
	III	1.00	1.00	0.96
	V/VI	0.14	0.09	0.00* (32)

^*Results statistically significant at the 0.05 level. The area with the higher axon length density is indicated in parentheses to the right of each significant result.