stimulus presentation

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Tom Fredrick
Tom Fredrick 2011-8-2
Hi everyone, please can someone assist me. I want to write a code that will allow the stimuli to be presented in sequence (one after the other). Firstly, at the same location, and secondly on a different locations on the screen. The display interval for each object is 200ms.
Thanks in advance for your kind support.
Tom

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Paulo Silva
Paulo Silva 2011-8-2
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Tom Fredrick
Tom Fredrick 2011-8-2
Thanks Paulo. I'll take a look at your reference shortly.

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Sean de Wolski
Sean de Wolski 2011-8-2
Sounds like you want a while/for loop with a pause
doc while
doc for
doc pause
or a timer function.
doc timer
I don't know what you mean by "present stimuli" so you'll have to describe it in significantly more detail. Probably you want to show something then get rid of it after 200ms?
E.g. EDITTED again
%Store some images %get all pictures ahead of time
imgs = cell(5,1);
imgs{1} = imread('pout.tif');
imgs{2} = imread('cameraman.tif');
imgs{3} = imread('football.jpg');
imgs{4} = imread('coins.png');
imgs{5} = imread('peppers.png');
figure;
axis ij
for ii = 1:length(imgs)
H = imshow(imgs{ii});
pause(.2)
delete(H)
end
  6 个评论
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Tom Fredrick
Tom Fredrick 2011-8-2
Thanks again Sean. Will try it out straight away.
Bruno Sousa
Bruno Sousa 2012-6-22
Thanks Sean, I didn't need exactly what you wrote here, but it was very useful to gave me an ideia to solve a problem!

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Daniel Shub
Daniel Shub 2011-8-2
If you really want 200ms and want to take into account screen refreshes, then you cannot do it easily in MATLAB. People have written packages to do this. I would suggest either MGL http://gru.brain.riken.jp/doku.php/mgl/overview or Psychtoolbox http://psychtoolbox.org/wikka.php?wakka=HomePage.
If you are okay with a few screen refreshes of jitter (i.e., +/- 20ms) then you can do it how Sean suggests with timers, while, for pause, etc.

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