Table 1.

Average LBA model parameter estimates for the older and younger participants

	Elderly	Young
Mean drift rate: accumulator corresponding to the correct response	3.05 (0.18)	2.53 (0.13)
Mean drift rate: accumulator corresponding to the incorrect response	1.57 (0.23)	0.69 (0.19)
Size of start point distribution (A)	1.33 (0.13)	0.73 (0.079)
Non-decision time (t0)	0.292 (0.028)	0.286 (0.011)
Response threshold (b, accuracy condition)	1.86 (0.24)	0.976 (0.094)
Response threshold (b, neutral condition)	1.71 (0.21)	0.914 (0.091)
Response threshold (b, speed condition)	1.36 (0.15)	0.76 (0.792)

Numbers in parentheses show SEs under the assumption of normal sampling distributions.