Table 2.

The scores of the NASA Task Load Index collected from the subjects involved in the 1-, 2-, 3-back tasks. The subjects are numbered from A to J.

Subject Index	A	B	C	D	E	F	G	H	I	J
1-back task	22	21	31	35	38	20	31	29	30	39
2-back task	44	55	46	51	43	52	45	53	52	54
3-back task	69	62	65	78	63	77	71	80	61	70