Motor speed does not impact the drift rate: a computational HDDM approach to differentiate cognitive and motor speed

Cognitive Research: Principles and Implications

Table 2 Model fits for Experiments 1 and 2 and model selection using Bayesian Predictive Information Criterion (BPIC)

Model	Drift Rate (v)	Boundary separation (a)	Non-decision time (Ter)	Experiment 1		Experiment 2
Model	Drift Rate (v)	Boundary separation (a)	Non-decision time (Ter)	BPIC	Difference from best model	BPIC	Difference from best model
Model 1 (full model)	SS, SPC	SS, SPC	SS, SPC	24,498	34	55,216	100
Model 2	SPC	SS, SPC	SS, SPC	25,111	647	55,510	394
Model 3	SS		SS, SPC	24,786	322	55,758	642
Model 4	SS	SS, SPC	SS, SPC	24,464	0	55,150	34
Model 5	SS	SS	SS, SPC	24,664	200	55,116	0
Model 6	SS	SPC	SS, SPC	24,592	128	55,765	649
Model 7	SS	SS, SPC	SS	24,697	233	55,474	358
Model 8	SS	SS, SPC	SPC	25,021	557	55,574	458
Model 9		SS, SPC		26,058	1594	56,492	1376