. Author manuscript; available in PMC: 2023 Jun 1.

Published in final edited form as: J Exp Psychol Gen. 2021 Nov 4;151(6):1377–1393. doi: 10.1037/xge0001133

Table 4:

Diffusion model parameters for item recognition and lexical decision.

	a	T_er	η	s_z	p₀	s_t	z	v₁	v₂	v₃	v₄	χ²
AD Rn mean	0.217	0.734	0.208	0.121	0.002	0.318	0.124	0.106	0.097	−0.024	−0.127	48.5
MCI Rn mean	0.212	0.712	0.237	0.120	0.003	0.249	0.119	0.106	0.169	−0.157	−0.227	49.5
MD Rn mean	0.214	0.719	0.229	0.120	0.003	0.268	0.120	0.106	0.149	−0.120	−0.199	49.3
MD control Rn mean	0.179	0.647	0.311	0.099	0.004	0.192	0.107	0.130	0.276	−0.355	−0.436	51.5
RTM11 mean	0.123	0.598	0.191	0.043	0.001	0.204	0.060	0.081	0.191	−0.253	−0.309	68.6
AD Lex mean	0.250	0.629	0.133	0.035	0.023	0.245	0.147	0.413	0.217	0.135	−0.200	38.6
MCI Lex mean	0.261	0.651	0.127	0.071	0.012	0.246	0.151	0.391	0.227	0.143	−0.209	39.3
MD Lex mean	0.258	0.645	0.129	0.061	0.015	0.245	0.150	0.397	0.224	0.141	−0.207	39.1
MD control Lex mean	0.221	0.570	0.141	0.062	0.010	0.185	0.127	0.512	0.283	0.179	−0.279	37.8
AD Rn SD	0.054	0.148	0.098	0.057	0.003	0.151	0.038	0.104	0.086	0.114	0.116	13.0
MCI Rn SD	0.065	0.114	0.104	0.065	0.010	0.149	0.045	0.142	0.153	0.148	0.140	15.3
MD Rn SD	0.062	0.124	0.102	0.063	0.009	0.152	0.043	0.132	0.141	0.151	0.140	14.6
MD control Rn SD	0.050	0.068	0.056	0.054	0.012	0.096	0.034	0.135	0.134	0.135	0.143	17.9
RTM11 SD	0.032	0.087	0.099	0.031	0.010	0.100	0.027	0.145	0.145	0.136	0.157	23.3
AD Lex SD	0.072	0.141	0.073	0.079	0.038	0.174	0.053	0.153	0.086	0.063	0.107	18.8
MCI Lex SD	0.066	0.127	0.081	0.076	0.028	0.171	0.048	0.166	0.114	0.101	0.121	15.7
MD Lex SD	0.068	0.130	0.079	0.076	0.031	0.171	0.049	0.165	0.108	0.093	0.117	16.5
MD control Lex SD	0.067	0.082	0.074	0.078	0.024	0.124	0.042	0.142	0.110	0.096	0.138	17.3

Boundary separation is a, starting point is z, mean nondecision time is T_er , the SD in drift across trials is η, range of the distribution of starting point s_z , range of the distribution of nondecision times, s_t , and p_o is the proportion of contaminants. The subject groups are as in Table 1, Rn means item recognition, Lex means lexical decision. For item recognition, v₁ represents high frequency old words, v₂ represents low frequency old words, v₃ represents high frequency new words, and v₄ represents low frequency new words. For lexical decision, v₁ represents high frequency words, v₂ represents low frequency words, v₃ represents very low frequency words, and v₄ represents pseudowords.