function [Par] = JA_Average_previous_trials(Par)


moving_avg = 5;
fixed_RT = 0.4;

% at the very first trial of the block, SBJ_RT is not known
% so it is set at 0.4 + charge = 0.7

if Par.tr == 1 % if it is the first trial of the very first game
    
    % set it to a standard velocity
    Par.CF_RT{Par.tr} = fixed_RT + Par.charge; % 0.4 + charge
    Par.SBJ_RT_median{Par.tr} =  Par.CF_RT{Par.tr};
    %return soon after assigning the fixed_RT to the CF_RT of the current trial
    % so the reading does not enter the next if cycles
    return
    
end


% then, it is possible that the SBJ anticipates/posticipates at the second
% trial so there would be no info av avilable about SBJ RTs yet

% if trial is the second one, check if there is already a valid SBJ_RT from
% the trial before
if (Par.tr == 2) && isempty(Par.SBJ_RT{Par.tr-1})
    
    % for now assign a value to SBJ_RT even though no response has been
    % provided. In case for example, SBJ does not produce a valid response in
    % the preceding (first) trial, keep CF_RT at fixed_RT value
    
    Par.CF_RT{Par.tr} = fixed_RT + Par.charge; % 0.4 + charge
    Par.SBJ_RT{1} = Par.CF_RT{Par.tr}; % 0.4 + charge
    Par.SBJ_RT_median{Par.tr} = Par.CF_RT{Par.tr};
    return
    
    
    
end



% if the script gets here it means that there is at least one number in
% the SBJ_RT up to trial 2. so, until trials are 'movging_avg' number do
% median onto the available values
if (Par.tr >= 2) && (Par.tr <= moving_avg)
    
    % median between trial 1 to eventually trial 4 to put as CF_RT in
    % trials up to 5 (moving_avg)
    Par.CF_RT{Par.tr} = median(cell2mat(Par.SBJ_RT(1:Par.tr-1)));
    Par.SBJ_RT_median{Par.tr} = Par.CF_RT{Par.tr};
    return
    
end


% from trials >= 6
if (Par.tr > moving_avg)
    
    % PAY ATTENTION if too many no-responses it throw errors
    %     Par.SBJ_RT
    %
    % ans =
    %
    %     [0.7000]    []    []    []    []    []    []
    
    
    if  ~isnan(median(cell2mat(Par.SBJ_RT(Par.tr-(moving_avg):Par.tr-1))))
        
        % slide the median considering only the last 'moving_avg' number of trials
        Par.CF_RT{Par.tr} = median(cell2mat(Par.SBJ_RT(Par.tr-(moving_avg):Par.tr-1)));
        
    else
        
        Par.CF_RT{Par.tr} = median(cell2mat(Par.SBJ_RT(1:Par.tr-1)));
        
    end
    
    Par.SBJ_RT_median{Par.tr} = Par.CF_RT{Par.tr};
    return
    
end


%logging{Par.tr}.RT_SBJ_avg = RT_SBJ_avg{Par.tr};

end