You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: spm_dcm_neural_priors.m
    path of file: ./repos/spm/toolbox/dcm_meeg
    
    the code of the file until where you have to start completion: function [pE,pC] = spm_dcm_neural_priors(A,B,C,model)

    
function [pE,pC] = spm_dcm_neural_priors(A,B,C,model)
% Prepare the priors on the parameters of neural mass models
% FORMAT [pE,pC] = spm_dcm_neural_priors(A,B,C,'model'))
%
% A,B{m},C  - binary constraints on extrinsic connections for m conditions
% 'model'   - 'ERP','SEP','CMC','LFP','NNM' or 'MFM'
%
% pE - prior expectation - f(x,u,P,M)
%
% synaptic parameters (for NMN and MFM)
%--------------------------------------------------------------------------
%    pE.T - synaptic time constants
%    pE.H - synaptic densities
%    pE.S - activation function parameters
%
% connectivity parameters
%--------------------------------------------------------------------------
%    pE.A  - extrinsic
%    pE.B  - trial-depend