/usr/share/psychtoolbox-3/PsychHardware/BitsPlusToolbox/BitsPlusDemos/ is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/psychtoolbox-3/PsychHardware/BitsPlusToolbox/BitsPlusDemos/BitsLutStereoDemo.m
/usr/share/psychtoolbox-3/PsychHardware/BitsPlusToolbox/BitsPlusDemos/BitsPlusCSFDemo.m
/usr/share/psychtoolbox-3/PsychHardware/BitsPlusToolbox/BitsPlusDemos/BitsPlusMovieDemo.m
/usr/share/psychtoolbox-3/PsychHardware/BitsPlusToolbox/BitsPlusDemos/BitsStereoDemo.m
/usr/share/psychtoolbox-3/PsychHardware/BitsPlusToolbox/BitsPlusDemos/ColourStereoDemo.m
/usr/share/psychtoolbox-3/PsychHardware/BitsPlusToolbox/BitsPlusDemos/MonoStereoDemo.m
/usr/share/psychtoolbox-3/PsychHardware/BitsPlusToolbox/BitsPlusDemos/demoColourCSF.m
/usr/share/psychtoolbox-3/PsychHardware/BitsPlusToolbox/BitsPlusDemos/demoMonoCSF.m