Table 4.

Friedman test statistics of problem-solving accuracy as a function of experimental conditions

Condition	Verbal IP			Spatial IP			Verbal NIP			Spatial NIP
	Med	M	SD	Med	M	SD	Med	M	SD	Med	M	SD
Silence	0.5	0.62	0.38	0	0.39	0.48	1	0.69	0.43	0.5	0.5	0.38
Articulatory suppression	0.5	0.64	0.39	0	0.42	0.47	0.5	0.4	0.44	0.5	0.43	0.39
Spatial tapping	0.5	0.65	0.39	0	0.32	0.4	0.5	0.45	0.47	0.5	0.43	0.38
χ2(2)		0.02			1.74			22.53***			2.57

IP insight problems, NIP non-insight problems

***p < 0.001