Roughness perception in haptic virtual reality for sighted and blind people.

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 nonlinearity to those obtained in physical reality using rigid probes (Klatzky, Lederman, Hamilton, Grindley, & Swendsen, 2003; Lederman, Klatzky, Hamilton, & Ramsay, 1999). Individual functions gave a different picture. Of 23 total participants, there were 13 with wholly descending linear psychometric functions, 7 with quadratic functions similar to the group function, and 3 with anomalous functions. Individual power law exponents showed no significant effects of visual status. All analyses gave a power law exponent close to -0.80. The implications for theories of roughness, methodologies of data analysis, and the design of haptic virtual reality interfaces are considered.

Establishing and training health care facility decontamination teams.

Recent terrorist events, changes in Joint Commission on Accreditation of Healthcare Organizations requirements, and availability of grant funding have focused health care facility attention on emergency preparedness. Health care facilities have historically been underprepared for contaminated patients presenting to their facilities. These incidents must be properly managed to reduce the health risks to the victims, providers, and facility. A properly equipped and well-trained health care facility team is a prerequisite for rapid and effective decontamination response. This article reviews Occupational Safety and Health Administration (OSHA) training requirements for personnel involved with decontamination responses, as well as issues of team selection and training. Sample OSHA operations-level training curricula tailored to the health care environment are outlined. Initial and ongoing didactic and practical training can be implemented by the health care facility to ensure effective response when contaminated patients arrive seeking emergency medical care.