“…These deviations have been observed in haptic parallelity tasks performed in different planes, like the (mid)horizontal plane (e.g. Kaas & Van Mier, 2006, Kappers, 1999Kappers & Koenderink, 1999;Newport, Rabb, & Jackson, 2002; Zuidhoek, Kappers, Van der Lubbe, & Postma, 2003;Van Mier, 2013), the frontoparallel plane (Hermens, Kappers, & Gielen, 2006;Volcic, Kappers, & Koenderink, 2007), the midsagittal plane (Kappers, 2002;2004), the threedimensional plane and for both unimanual and bimanual responses (Kappers & Koenderink, 1999;Kappers, 2002). A study by Fernández-Díaz and Travieso (2011) even found large and systematic deviations when the parallelity task was performed in rear peripersonal space (behind the back of the participant), with deviations clearly being influenced by the natural orientation of the hand.…”