Table 1. The “5/4” Category Structure.

Stimulus	D1	D2	D3	D4
Note. Prior to scanning, participants learned, through trial and error, to categorize the first nine stimuli (Category A: A1–A5; Category B: B1–B4) illustrated in Figure 2A. During scanning, they categorized both the training and the transfer (T1–T7) stimuli. Perceptual stimulus dimensions (Figure 2) were pseudo-randomly assigned to category dimensions for each participant.
A1	1	0	0	0
A2	1	0	1	0
A3	0	1	0	0
A4	0	0	1	0
A5	0	0	0	1
B1	1	1	0	0
B2	1	0	0	1
B3	0	1	1	1
B4	1	1	1	1
T1	0	1	1	0
T2	1	1	1	0
T3	0	0	0	0
T4	1	1	0	1
T5	0	1	0	1
T6	0	0	1	1
T7	1	0	1	1