In a study using the first version of the
Morpheotron Interface (Dostmohamed, H., Hayward, V. Trajectory of Contact
Region On the Fingerpad Gives the Illusion of Haptic Shape. Exp. Brain
Res. Online. 2005.), we investigated the contact location trajectory cue
the fingerpad. Local deformation trajectories were created using the Morpheotron by the rolling of a flat plate on the fingerpad during manual exploration of virtual surface. This was done such that the plate was kept tangent to a virtual shape at the point of virtual contact. We found that when the trajectory of this region on the fingerpad was artificially controlled so as to resemble the trajectory that is normally present while exploring a real object, the experience of shape was created.
Following the inception of the first Morpheotron, we have subsequntly
revised the design such that the new version lends a system capable of independently presenting the three elementary cues discussed in the previous page (which are deemed to be important for the haptic perception of shape). The ability to independently segregate each cue allows the investigation of the contribution of each to the overall haptic perception of shape. Ongoing studies seek to quantify these contributions under varying conditions while exploring gaussian stimuli.
Version-III of the Morpheotron Haptic Interface