Table 1.

Experimental Phases – Experiment 1

Phase	Task	Stimuli per trial	Trials per block	Training Criterion
Pretraining	Tact-1 (pairs)	2	8	2 blocks at 100%
Pretraining	Tact-2 (all stimuli)	6	6	2 blocks at 100%
Pretraining	Listener-1	3	6	2 blocks at 100%
Pretraining	Listener-2	6	6	2 blocks at 100%
Pretraining	Categorization Pretraining	6	6	2 blocks at 100%
1	Categorization Pretest 1	6	6	N/A
	Categorization Pretest 2	6	6	N/A
2	Listener-1 Pretest	3	6	N/A
3	Tact-1 Training (pairs)	2	8	3 blocks at 100%
4	Cat. Pretraining Review	6	4	1 block at 100%
5	Categorization Posttest 1	6	6	N/A
	Categorization Posttest 2	6	6	N/A
6	Listener-1 Posttest	3	6	N/A
7a	Listener-2 Pretest	6	6	N/A
8a	Tact-2 Training (all stimuli)	6	6	3 blocks at 100%
9a	Cat. Pretraining Review	6	4	1 block at 100%
10a	Categorization Posttest 1	6	6	N/A
	Categorization Posttest 2	6	6	N/A
11a	Listener-2 Posttest	6	6	N/A
12b	Posttest Interview	N/A	N/A	N/A

^aChildren were exposed to these phases only if they failed the previous categorization test.

^bChildren were exposed to this phase immediately after successful categorization tests.