Table 2. Percent Correct Responses to Each Interval, and the Resultant Bias Index, c, for N = 0 and N = 1.

N	Presponse		Target interval		Bias, c
	Interval	Correct	1	2
Note. In the first row all the data is aggregated together (N = 0). The near-zero value of c indicates minimal bias. In Rows 2–5, the same data is partitioned contingent upon the immediately preceding pesponse (N = 1). Positive and negative c values indicate Interval 2 and Interval 1 preferences, respectively. The data is a subset of that given graphically in Figure 4.
0	all	all	48.8	50.9	0.03
	1	no	45.0	56.2	0.14
		yes	58.6	43.5	−0.19
1	2	no	54.1	45.8	−0.11
		yes	37.9	58.0	0.25