Psychophysical functions for perceived roughness, relating ln (magnitude estimate of roughness) to ln (groove width), were obtained for blind and sighted participants in virtual reality using the PHANToM force feedback device. The stimuli were sinusoidal surfaces with groove widths between 0.675 mm and 20.700 mm. Group functions showed a similar… (More)
This paper reports work in progress at BT Labs to investigate the use of haptic display as a component of an emerging de facto standard (VRML) for the display of three dimensional images on the WWW. We discuss the use of a simple haptic interface to provide access to three dimensional virtual images. This is based on our experience of developing a browser… (More)
1. ABSTRACT This paper describes a series of studies involving a haptic device which can display virtual textures and 3-D objects. The device has potential for simulating real world objects and assisting in the navigation of virtual environments. Three experiments investigated: (a) whether previous results from experiments using real textures could be… (More)
There have been emerging cases of medication refractory obsessions, impulsivity, compulsivity, and/or punding in Parkinson's disease. These cases have proven difficult to treat, even for the experienced clinician. We report several medication refractory cases with a positive response to treatment with clozapine.
Typically, the mechanical feedback that a user obtains during a gesture is simply the mechanical weight and friction of the specific input device being employed. This is very different from everyday experience. Here mechanical feedback to the hand and arm results from the manual manipulation of tools and other objects. This paper reports preliminary… (More)
This paper describes a series of studies involving a haptic device which can display virtual textures and 3-D objects. The device has potential for simulating real world objects and assisting in the navigation of virtual environments (VEs). Three experiments investigated: (a) whether previous results from experiments using real textures could be replicated… (More)
The incorporation of the sense of touch (haptic sense) into virtual reality (VR) has considerable potential to enhance the realism of virtual environments and make VR accessible to blind people. This paper summarises a series of investigations into the haptic perception of texture and object size/angularity in VR, with two haptic devices. Guidelines for the… (More)
This paper describes two studies concerning the use of haptic virtual environments for blind people. The studies investigated the perception of virtual textures and the perception of the size and angles of virtual objects. In both studies, differences in perception by blind and sighted people were also explored. The results have implications for the future… (More)