Table 1. Exemplar and Feature Frequency.

	TEST PHASE					TRAINING PLUS TEST PHASES
Condition	Exemplars	Trials	Exemplar frequency	Relevant feature frequency	Specific body part frequency	Relevant feature frequency	Specific body part frequency
Experiment 1
Old Far Boundary	10	100	3.03%	33.3%	12.1%	33.3%	13.7%
New Far Boundary	60	60	0.30%	33.3%	1.8%	33.3%	1.2%
Near Boundary	60	60	0.30%	33.3%	12.1%	33.3%	13.7%
Common Other	10	60	1.82%	18.2%	9.1%	23.5%	11.8%
Novel Other	50	50	0.30%	15.2%	3.0%	9.8%	2.0%
Experiment 2
Far Boundary	10	100	2.86%	22.9%	11.4%	27.7%	13.7%
Near Boundary	60	60	0.29%	22.9%	11.4%	27.7%	13.7%
Common Other	10	140	4.00%	40.0%	20.0%	34.0%	17.0%
Novel Other	50	50	0.29%	14.3%	7.1%	10.5%	5.3%

Note. The frequency of an exemplar or feature is the percentage of trials in which it occurs. Features relevant to the categorization rule are global body shape (horse-like, humanoid, fish-like, plant-like), color, and body markings. Specific body parts (e.g. which particular horse-head was used to create a horse-like shape) are irrelevant to the categorization rule. Note that for the Near and Far Boundary stimuli, relevant-feature frequency is equivalent to the frequency of the correct response category (i.e., 33% of the stimuli should be labeled as Mogs, 33% as Nibs in Experiment 1). Common and Novel Others were assigned to the same response category, so that their relevant-feature frequency sums to the probability of the “Other” response category (33% in Experiment 1, 54% in Experiment 2).