This toolbox can be used to perform model fitting and to generate simulations for the attentional drift-diffusion model (aDDM), as well as for the classic version of the drift-diffusion model (DDM) without an attentional component.
aDDM-Toolbox supports Python 2.7 (and Python 3.6 tentatively -- please report any bugs). The following libraries are required:
$ pip install addm_toolbox
To make sure everything is working correctly after installation, try (from a UNIX shell, not the Python interpreter):
This should take a while to finish, so maybe go get a cup of tea :)
To get a feel for how the algorithm works, try:
$ addm_demo --display-figures
You can see all the arguments available for the demo using:
$ addm_demo --help
Here is a list of useful scripts which can be similarly run from a UNIX shell:
You can also have a look directly at the code in the following modules:
- addm.py contains the aDDM implementation, with functions to generate model simulations and obtain the likelihood for a given data trial.
- ddm.py is equivalent to addm.py but for the DDM.
- addm_pta_test.py generates an artificial data set for a given set of aDDM parameters and attempts to recover these parameters through maximum a posteriori estimation.
- ddm_pta_test.py is equivalent to addm_pta_test.py but for the DDM.
- addm_pta_mle.py fits the aDDM to a data set by performing maximum likelihood estimation.
- addm_pta_map.py performs model comparison for the aDDM by obtaining a posterior distribution over a set of models.
- simulate_addm_true_distributions.py generates aDDM simulations using empirical data for the fixations.
If you get errors while using the toolbox under Python 3, try it with Python 2.7.
If you get a Python RuntimeError with the message "Python is not installed as a framework.", try creating the file ~/.matplotlib/matplotlibrc and adding the following code:
This project is licensed under the GNU GENERAL PUBLIC LICENSE - see the COPYING file for details.
This toolbox was developed as part of a research project in the Rangel Neuroeconomics Lab at the California Institute of Technology.