Or any other key...

This is my code:

[keyIsDown,secs,keyCode, deltaSecs] = KbCheck 
while keyIsDown == 0;                          %Will present this screen until a key is pressed 
  [keyIsDown, secs, keyCode, deltaSecs] = KbCheck;
  %RT = GetSecs - starttrial - time;
  if q1tri == 1 && q1col == 1 && keyCode(1,98) == 1       %down          
      Screen('FillRect',window,[0 0 0])
      Screen('Flip',window)
      WaitSecs(tar);
  elseif q1tri == 2 && q1col == 1 && keyCode(1,104) == 1                  %up
      Screen('FillRect',window,[0 0 0])
      Screen('Flip',window)
      WaitSecs(tar);
  elseif q1tri == 3 && q1col == 1 && keyCode(1,100) == 1;                  %left
      Screen('FillRect',window,[0 0 0])
      Screen('Flip',window)
      WaitSecs(tar);
  elseif q1tri == 4 && q1col == 1 && keyCode(1,102) == 1;                    %right
      Screen('FillRect',window,[0 0 0])
      Screen('Flip',window)
      WaitSecs(tar);
  end

What this says is that when a target color is present, and the keyboard arrow key matches the arrow displayed it produces a black screen for a particular amount of time. What I need is code that says something like if any other key is pressed (including the arrow keys that don't match), it produces a black screen for a different amount of time. I tried using pause and input commands, but they didn't seem to work. :(

any help, would be super appreciated, Brett

[Brett]

I ended up grunting it out, but I'm still curious if anyone knows a really easy way to do this. :)

[Jan]

I do not understand the question. I do neither know the function KbCheck(), not the values of the variables q1col, q1tri and tar. What is "the arraow displayed"? Is the replied keyCode really a vector?

Answer 1

[Jan]

I try to guess:

Screen('FillRect',window,[0 0 0])
Screen('Flip',window)

keyIndex = find(keyCode(1, [98, 104, 100, 102]));  % ???
if q1col && length(keyIndex) == 1 && (q1tri == keyIndex)
  WaitSecs(tar);
else
  WaitSecs(theOtherTar);
end