%以下是一个使用例程，可以显示出按下的按键和时间间隔
%原文 http://my.oschina.net/u/1387924/blog/379421
KbName('UnifyKeyNames');
Screen('Preference', 'SkipSyncTests', 1);
[winPt, winRect]=Screen('OpenWindow',0,175, [500 300 800 370]);
keyUp = KbName('UpArrow');
keyDown = KbName('DownArrow');
keyLeft = KbName('LeftArrow');
keyRight = KbName('RightArrow');
lastsecs = 0;
key = 0;
disp_txt = '';
Screen('DrawText',winPt,'随便玩，按esc退出',0,0,0);
Screen('Flip',winPt);
while key ~= KbName('Escape')
[secs, key] = KbGet();
if key == keyUp
disp_txt = '上';
elseif key == keyDown
disp_txt = '下';
elseif key == keyLeft
disp_txt = '左';
elseif key == keyRight
disp_txt = '右';
elseif key ~= 0
disp_txt = ['你按下了' num2str(KbName(key))];
end
Screen('DrawText',winPt,disp_txt,0,0,0);
time = secs - lastsecs;
Screen('DrawText',winPt,['距离上次按键' num2str(time) '秒'],0,24,0);
Screen('Flip',winPt);
lastsecs = secs;
end
Screen('CloseAll');