Photographs of the two tactile devices (panel A: tactile rod; panel C: tactile plate) used in experiment 1 and 2. For the tactile rod, firm grasp using a wrap grip with the entire palm is mandatory (panel B), whereas for the tactile plate slight touch with the fingertips is needed (panel D). Grasping either device was done in such a way that the Velcro is located between the thumb and the index finger, as shown in Figure 2B (Velcro partially covered by the grasping hand) and Figure 2D.
Tarnutzer et al. BMC Neuroscience 2012 13:114 doi:10.1186/1471-2202-13-114