I face the following error:
Undefined function 'Screen' for input arguments of type 'char'. Error in IB_BaselineAction (line 29) Screen('Preference', 'VisualDebuglevel', 0);
Yasaman Hassanzadeh
% initializing PTB screen
Screen('Preference', 'VisualDebuglevel', 0);
[won, rect_window]=Screen('OpenWindow',0, colourbackground, ScreenSizeInPixels);
flipInterval=Screen('GetFlipInterval', won);
HideCursor;
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