Diffusion model review by Ratcliff and McKoon
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2474742/
- RT < 1.5 seconds
- 2 choice task
- single staged
Drift rate variability: The across-trial variability in drift rate is assumed to be normally distributed with standard deviation η.
Starting point variability: The starting point is assumed to be uniformly distributed with range sz, a Non decision component var: nondecision component is assumed to be uniformly distributed with range st.
Fitting methods
at a chi-square method using quantile RTs provided the best balance between accurate recovery of parameter values (with the smallest variability in parameter estimates) and robustness to contaminant RTs (e.g., outlier RTs)
- chi square error, minimize using SIMPLEX algo