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- function spm_MDP_da(MDP)
- % Simulated histograms of dopamine firing
- % FORMAT spm_MDP_da(MDP)
- %
- % See also: spm_MDP_game, which generalises this scheme and replaces prior
- % beliefs about KL control with minimisation of expected free energy.
- %__________________________________________________________________________
- % Copyright (C) 2015 Wellcome Trust Centre for Neuroimaging
- % Karl Friston
- % $Id: spm_MDP_da.m 6451 2015-05-26 09:26:03Z karl $
- % deconvolve to simulate dopamine responses
- %--------------------------------------------------------------------------
- wn = MDP.d;
- da = pinv( tril(toeplitz(exp(-((1:length(wn)) - 1)'/8))) )*wn;
- da = da(4:end);
- % peristimulus time histogram
- %--------------------------------------------------------------------------
- pst = (1:length(da))*256;
- r = 256;
- psth = r*da + randn(size(da)).*sqrt(r*da);
- bar(pst,psth,1)
- title('Simulated dopamine responses','FontSize',16)
- xlabel('Peristimulus time (ms)','FontSize',12)
- ylabel('Spikes per bin','FontSize',12)
- axis([pst(1) pst(end) 0 max(psth)*(1 + 1/4)])
- axis square
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