function trials = runPractice(disp_struct, task_struct, ioObject, LTP1address)
    % use cards [13 14 15 16] for practice trials
    
    % set up the practice trials
    trials = nan(6, task_struct.cRT);
    trials(:,task_struct.cBlock) = -1;
    trials(:,task_struct.cTrialNum) = 1:size(trials,1);
    trials(:,task_struct.cTrialID) = 1:size(trials,1);
    trials(:,task_struct.cTrialCond) = [task_struct.FC, task_struct.NC, task_struct.FC, task_struct.FC, task_struct.NC, task_struct.NC];
    trials(:,task_struct.cTrialType) = task_struct.PRAC;
    trials(:,task_struct.cS1) = [13 15 13 13 15 15];
    trials(:,task_struct.cS1Rew) = [task_struct.WIN task_struct.WIN task_struct.WIN task_struct.LOSS task_struct.LOSS task_struct.WIN];
    trials(:,task_struct.cS2) = [14 16 14 14 16 16];
    trials(:,task_struct.cS2Rew) = [task_struct.WIN task_struct.WIN task_struct.WIN task_struct.LOSS task_struct.LOSS task_struct.WIN];
    trials(:,task_struct.cIsS1Left) = [1 1 0 1 0 1];
    trials(:,task_struct.cRespAct) = [nan 15 nan nan 16 15];
    trials(:,task_struct.cRespRew) = [nan task_struct.WIN nan nan task_struct.LOSS task_struct.WIN];
    
    % loop through each practice trial
    for tI = 1 : size(trials,1)
        runTrainTrial(disp_struct, task_struct, trials(tI,:), ioObject, LTP1address);
    end % for each trial
    
end % practice