Table 2. SHJ Category Structures.

Stimulus	D1	D2	D3	Type I	Type II	Type VI
Note. Participants learned by trial-and-error to perform the Type I (a one-dimensional rule-based categorization task), Type II (a two-dimensional XOR rule-based categorization task), and Type VI (a three-dimensional task requiring memorization of the individual stimuli) problems during scanning. For each participant, perceptual stimulus dimensions (Figure 2) were randomly assigned to these abstract category dimensions.
1	0	0	0	A	A	A
2	0	0	1	A	B	B
3	0	1	0	A	B	B
4	0	1	1	A	A	A
5	1	0	0	B	A	B
6	1	0	1	B	B	A
7	1	1	0	B	B	A
8	1	1	1	B	A	B