MATLAB: How to add a time limit to response time

MATLABresponse timetime limit

I want to add time limit to the response time. I have a code for "wait for response", but I don't know where and what code I should add. (I refered several codes but didn't work) I'm using Psychtoolbox,
%Wait for response    
    while keyOn == 0
        [keyIsDown,secs,keycode] = KbCheck;
        if keycode(spaceKey) || keycode(num1Key) || keycode(num2Key) || keycode(num3Key) ...
                || keycode(num4Key) || keycode(num5Key) || keycode(num6Key) ...
                    || keycode(num7Key) || keycode(num8Key) || keycode(num9Key)
            keyOn = 1;
        end
    end
Thank you!

Best Answer

One way is to use GetSecs, which returns the current time. For example,
MaxWait = 1.5;  % As an example, suppose you want a maximum RT of 1.5 seconds
StopTime = GetSecs + MaxWait;  % This computes the time at which you want to stop (max RT)
while (keyOn==0) && (GetSecs<StopTime)  % add the time check to your while loop
    % The rest of your while loop goes here
end
% You will reach this point if a key is pressed or if MaxWait elapses with no key press.
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