/usr/share/psychtoolbox-3/PsychHardware/PsychGamepad/ is in psychtoolbox-3-common 3.0.9+svn2579.dfsg1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/psychtoolbox-3/PsychHardware/PsychGamepad/AxisCenter.m
/usr/share/psychtoolbox-3/PsychHardware/PsychGamepad/AxisDown.m
/usr/share/psychtoolbox-3/PsychHardware/PsychGamepad/AxisLeft.m
/usr/share/psychtoolbox-3/PsychHardware/PsychGamepad/AxisMax.m
/usr/share/psychtoolbox-3/PsychHardware/PsychGamepad/AxisMin.m
/usr/share/psychtoolbox-3/PsychHardware/PsychGamepad/AxisRight.m
/usr/share/psychtoolbox-3/PsychHardware/PsychGamepad/AxisUp.m
/usr/share/psychtoolbox-3/PsychHardware/PsychGamepad/Contents.m
/usr/share/psychtoolbox-3/PsychHardware/PsychGamepad/Gamepad.m
/usr/share/psychtoolbox-3/PsychHardware/PsychGamepad/HatCenter.m
/usr/share/psychtoolbox-3/PsychHardware/PsychGamepad/HatDown.m
/usr/share/psychtoolbox-3/PsychHardware/PsychGamepad/HatLeft.m
/usr/share/psychtoolbox-3/PsychHardware/PsychGamepad/HatLeftDown.m
/usr/share/psychtoolbox-3/PsychHardware/PsychGamepad/HatLeftUp.m
/usr/share/psychtoolbox-3/PsychHardware/PsychGamepad/HatRight.m
/usr/share/psychtoolbox-3/PsychHardware/PsychGamepad/HatRightDown.m
/usr/share/psychtoolbox-3/PsychHardware/PsychGamepad/HatRightUp.m
/usr/share/psychtoolbox-3/PsychHardware/PsychGamepad/HatUp.m