Table 2.

Nonsymbolic Subtraction Problems of Experiment 3 and Susceptibility to Alternative Strategies

1	2	3	4	5	6	7	8	9	10	11	12	13
X	Y	X-Y	Z	Ratio	Correct choice (larger)	Choose X-Y strategy	Choose Z strategy	Y vs. Z strategy	X vs. Z strategy	Extreme X-value strategy	Extreme Z-value strategy	Spatio-temp. strategy
18	10	8	14	0.57	Z	−1	1	1	−1	1	0	1
26	14	12	21	0.57	Z	−1	1	1	−1	0	0	0
22	6	16	28	0.57	Z	−1	1	1	1	0	1	1
19	5	14	8	0.57	X-Y	1	−1	−1	1	1	1	1
27	6	21	12	0.57	X-Y	1	−1	−1	1	0	0	0
35	7	28	16	0.57	X-Y	1	−1	−1	1	1	0	0
16	8	8	12	0.67	Z	−1	1	1	−1	1	0	1
22	6	16	24	0.67	Z	−1	1	1	0	0	1	1
28	8	20	30	0.67	Z	−1	1	1	0	0	1	0
30	18	12	8	0.67	X-Y	1	−1	1	1	0	1	0
26	16	10	7	0.67	X-Y	1	−1	1	1	0	1	0
35	19	16	11	0.67	X-Y	1	−1	1	1	1	0	0
18	10	8	10	0.8	Z	−1	1	0	−1	1	0	1
24	8	16	20	0.8	Z	−1	1	1	−1	0	0	1
32	8	24	30	0.8	Z	−1	1	1	0	1	1	0
40	10	30	24	0.8	X-Y	1	−1	−1	1	1	1	0
32	12	20	16	0.8	X-Y	1	−1	−1	1	1	0	0
20	10	10	8	0.8	X-Y	1	−1	1	1	0	1	1