Table 4.

Average difference in preferred tuning by stimulus class (in degrees)

	RD	ES	SS	FL	AP	NF
RD	xxx	10.3	15.4	25.1	30.9	27.2
ES	10.3	xxx	10.6	20.2	21.3	25.5
SS	15.4	10.6	xxx	24.9	40	32.9
FL	25.1	20.2	24.9	xxx	31.9	16.7
AP	30.9	21.3	40	31.9	xxx	35.9
NF	27.2	25.4	32.9	16.7	35.9	xxx

This table is in the same format as Table 3. Numbers represent the average observed difference in preferred tuning direction between stimulus classes for individual units. Numbers are all positive because absolute values of these differences were taken. If feature invariance did not occur in MSTd, these averages would all be distributed at ∼90°. Thus, a considerable degree of invariance is indicated. Note that numbers are smaller when comparisons are made between classes that gave strong responses (RD, ES, SS).