. Author manuscript; available in PMC: 2021 Sep 1.

Published in final edited form as: Psychol Aging. 2020 Jul 27;35(6):850–865. doi: 10.1037/pag0000562

Table A1.

Means and standard deviations in parameter values across participant groups for fits of the diffusion model to the task-switch paradigm (for the model in the main text).

Group	Task	a	ƞ	s_z	s_t1	s_t2	s_t3	s_t4
		Mean
college students	Brightness	0.148	0.135	0.048	0.166	0.354	0.192	0.432
college students	Letter	0.139	0.113	0.045	0.136	0.231	0.143	0.249
61–74 year olds	Brightness	0.228	0.141	0.042	0.243	0.430	0.251	0.579
61–74 year olds	Letter	0.221	0.145	0.046	0.152	0.337	0.140	0.357
75–89 year olds	Brightness	0.256	0.138	0.051	0.298	0.364	0.275	0.563
75–89 year olds	Letter	0.239	0.152	0.060	0.154	0.354	0.140	0.400
		Standard deviation
college students	Brightness	0.043	0.038	0.026	0.078	0.157	0.083	0.191
college students	Letter	0.030	0.033	0.024	0.042	0.094	0.046	0.111
61–74 year olds	Brightness	0.061	0.038	0.042	0.107	0.222	0.173	0.189
61–74 year olds	Letter	0.049	0.034	0.034	0.072	0.180	0.075	0.211
75–89 year olds	Brightness	0.079	0.041	0.064	0.168	0.194	0.199	0.227
75–89 year olds	Letter	0.042	0.034	0.043	0.094	0.201	0.082	0.232

Note. Model with one boundary separation for pure and mixed blocks. a = boundary separation; ƞ = standard deviation in drift across trials; s_z = range of the distribution of starting point (z); s_t1 = range of the distribution of nondecision time components for pure and no-switch trials with short RSI; s_t2 = range of the distribution of nondecision time components for switch trials with short RSI; s_t3 = range of the distribution of nondecision time components for pure and no-switch trials with long RSI; s_t4 = range of the distribution of nondecision time components for switch trials with long RSI.