Dear Rémi
My colleague Thomas Parr, who is not on the SPM mailing list, provided the response below.
Best
Peter
-----Original Message-----
From: Parr, Thomas
Sent: 06 December 2017 15:17
To: Zeidman, Peter <[log in to unmask]>
Subject: RE: [SPM] spm_MDP_DEM function
Dear Rémi,
I suspect you will not need to use the spm_MDP_DEM function, as it is called in a subroutine in the spm_MDP_VB_X function that you are more likely to need. I would suggest looking at DEM_demo_MDP_search to get an idea of how to set up an input to this function. The paper associated with this demo is Berk Mirza's paper on scene construction (https://www.frontiersin.org/articles/10.3389/fncom.2016.00056/full).
This will help you to learn how to specify a single level MDP model. Once you have done so, you can start to think about hierarchical versions of this (e.g. http://www.sciencedirect.com/science/article/pii/S0149763416307096 ; https://www.nature.com/articles/s41598-017-15249-0), and a good example script is the DEM_demo_MDP_reading demo.
The spm_MDP_DEM function only comes in to play when you have specified a hierarchy of models that has a continuous state space model (inverted through generalised filtering) at the lowest level and a hierarchy of MDPs above it (decribed in http://www.mitpressjournals.org/doi/abs/10.1162/NETN_a_00018). I would recommend being very familiar with the MDP scheme alone, and with continuous state space models, before attempting to join the two.
If you would like more tailored advice, it would be useful to know exactly what you are trying to model?
I hope this helps
Kind regards
Thomas
-----Original Message-----
From: SPM (Statistical Parametric Mapping) [mailto:[log in to unmask]] On Behalf Of Rémi PHILIPPE
Sent: 06 December 2017 10:19
To: [log in to unmask]
Subject: [SPM] spm_MDP_DEM function
Hi everyone,
I'm in my first year PhD and I try to use the DEM part of SPM to model comportment. I want to use the spm_MDP_DEM function in order to make a hierarchy of POMDP, however their is no much documentation on this function (but the comment in the code). I would like to know what should be put inside a DEM structure and what what could be put inside.
If you have some documentation other example that those in the toolbox or advise i would be glad,
Many thanks,
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Rémi PHILIPPE
06 88 81 49 01
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