OS X: non-functioning keyboard read

[michael_tarr_brown]

Per advice, I am not using GetChar with Matlab R14 (7.0.1), rather, I am using KbCheck.
However, the following code snippet just loops forever... Why isn't it reading my
keypresses?

-m


escKey = KbName('escape');
noKey = KbName('z');
yesKey = KbName('/');

startTime = GetSecs;
while (1)

[keyIsDown,stopTime,keyCode] = KbCheck;

if keyCode(escKey);
ShowCursor;
Screen('CloseAll');
clear all;
error('Program interrupted by user.');
else
if keyCode(noKey)
response = 0;
break;
elseif keyCode(yesKey)
response = 1;
break;
end
end
end

rt = stopTime-startTime;