/usr/share/ is in octave-psychtoolbox-3 3.0.11.20140816.dfsg1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/psychtoolbox-3/PsychHardware/
/usr/share/psychtoolbox-3/PsychHardware/iViewXToolbox/
/usr/share/doc/
/usr/share/doc/octave-psychtoolbox-3/
/usr/share/doc/octave-psychtoolbox-3/copyright
/usr/share/doc/octave-psychtoolbox-3/changelog.Debian.gz
/usr/share/doc/octave-psychtoolbox-3/changelog.gz
/usr/share/psychtoolbox-3/
/usr/share/psychtoolbox-3/PsychHardware/iViewXToolbox/tcp_udp_ip/
/usr/share/psychtoolbox-3/PsychBasic/
/usr/share/octave/
/usr/share/octave/site/
/usr/share/octave/site/m/
/usr/share/psychtoolbox-3/PsychHardware/PsychHID.mex
/usr/share/psychtoolbox-3/PsychHardware/iViewXToolbox/tcp_udp_ip/pnet.mex
/usr/share/psychtoolbox-3/PsychBasic/moglcore.mex
/usr/share/psychtoolbox-3/PsychBasic/moalcore.mex
/usr/share/psychtoolbox-3/PsychBasic/WaitSecs.mex
/usr/share/psychtoolbox-3/PsychBasic/Screen.mex
/usr/share/psychtoolbox-3/PsychBasic/PsychPortAudio.mex
/usr/share/psychtoolbox-3/PsychBasic/PsychKinectCore.mex
/usr/share/psychtoolbox-3/PsychBasic/IOPort.mex
/usr/share/psychtoolbox-3/PsychBasic/GetSecs.mex
/usr/share/octave/site/m/psychtoolbox-3