function modify_mp(fld,monkey,sessions)

datadir = fld.procdatadir;
logdir = fullfile(fld.basedir,'Datasets', monkey ,'log');

fprintf('\n======================================================\n');
fprintf(['-- Running modify_mp for ' monkey ' --\n']);
fprintf('======================================================\n');

MP = [];
for sid = 1:length(sessions)
    % session info
    session = sessions{sid};
    q = strsplit(session,'_');
    cdate = q{2};
    block = str2num(q{3}(end-4));

    % load the data 
    session_id = [monkey '_' cdate '_' num2str(block)];
    sessiondir = fullfile(datadir,monkey,session_id);
    try 
        load(fullfile(sessiondir, [session_id '_channels.mat']));
    catch
        continue
    end
    
    new_gt = cell(0);
    new_sgt = cell(0);
    for ch = 1:size(mp,1)
        gt = mp.goodtrials(ch,:);
        
        % we shouldn't do this multiple times
        if iscell(gt)
            while size(gt,1)==1 && size(gt,2)==1
                gt = gt{1};
            end
            new_gt{ch} = gt;
        else
            new_gt{ch} = mp.goodtrials(ch,:);
        end
        
        sgt = mp.sample_wise_goodtrials(ch,:);
        if iscell(sgt)
            while size(sgt,1)==1 && size(sgt,2)==1
                sgt = sgt{1};
            end
            new_sgt{ch} = sgt;
        else
            new_sgt{ch} = mp.sample_wise_goodtrials(ch,:);
        end
    end
    mp.goodtrials = new_gt';
    mp.sample_wise_goodtrials = new_sgt';
    
    save(fullfile(sessiondir, [session_id '_channels.mat']),'mp');
end