How to add a time limit to response time?

Question

Takara Sumoto 2019-10-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/483052-how-to-add-a-time-limit-to-response-time

评论： Takara Sumoto 2019-10-2

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!

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Aquatris 2019-10-1

Can you add tic toc to your code?

You can start a tic and if toc gives you higher than the time limit you break the loop.

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Answer 1

Jeff Miller 2019-10-1

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https://ww2.mathworks.cn/matlabcentral/answers/483052-how-to-add-a-time-limit-to-response-time#answer_394318

在 MATLAB Online 中打开

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.