Electrotactile and vibrotactile displays for sensory substitution systems

Kaczmarek, K.A.; Webster, John G.; Bach-y-Rita, Paul; Tompkins, W.J.

doi:10.1109/10.68204

Cited by 693 publications

(476 citation statements)

References 91 publications

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“…However, pressure systems as used in EPT are highly sensitive to adaptation and the application of direct nerve stimulation is still in a very experimental stage. More applications were found for electrotactile stimulation, but the sensations evoked by it can be painful and unfamiliar to the user, likely because of the various kinds of mechanoreceptors that are activated simultaneously [96]. For this reason, the recent focus is mainly on vibrotactile stimulation, which has great potential because it is relatively unobtrusive to the user and the environment and, therefore, fulfills the comfort requirement.…”

Section: Feedbackmentioning

confidence: 99%

Myoelectric forearm prostheses: State of the art from a user-centered perspective

Peerdeman

Boere²,

Witteveen³

et al. 2011

JRRD

402

306

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Abstract-User acceptance of myoelectric forearm prostheses is currently low. Awkward control, lack of feedback, and difficult training are cited as primary reasons. Recently, researchers have focused on exploiting the new possibilities offered by advancements in prosthetic technology. Alternatively, researchers could focus on prosthesis acceptance by developing functional requirements based on activities users are likely to perform. In this article, we describe the process of determining such requirements and then the application of these requirements to evaluating the state of the art in myoelectric forearm prosthesis research. As part of a needs assessment, a workshop was organized involving clinicians (representing end users), academics, and engineers. The resulting needs included an increased number of functions, lower reaction and execution times, and intuitiveness of both control and feedback systems. Reviewing the state of the art of research in the main prosthetic subsystems (electromyographic [EMG] sensing, control, and feedback) showed that modern research prototypes only partly fulfill the requirements. We found that focus should be on validating EMG-sensing results with patients, improving simultaneous control of wrist movements and grasps, deriving optimal parameters for force and position feedback, and taking into account the psychophysical aspects of feedback, such as intensity perception and spatial acuity.

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Section: Feedbackmentioning

confidence: 99%

Myoelectric forearm prostheses: State of the art from a user-centered perspective

Peerdeman

Boere²,

Witteveen³

et al. 2011

JRRD

402

306

View full text Add to dashboard Cite

show abstract

“…While it is impossible in the design of a prosthetic limb to restore all biological structures, it is of primary importance to restore the biological functions involving tactile sensing and motor control as much as possible. There have been several attempts to provide sensation for amputees by sensory substitution (Kaczmarek et al, 1991). Sensory feedback systems used for limb prostheses may rely on pressure, electrotactile or vibrotactile skin stimulation (Kaczmarek et ah, 1991;Patterson and Katz, 1992;Kyberd et al, 1993).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the psychophysical detection threshold level for vibrotactile and pressure stimulation of prosthetic limbs using bone anchorage or soft tissue support

Jacobs

Brånemark

Olmarker

et al. 2000

Prosthetics &Amp; Orthotics International

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In the present study the psychophysical detection threshold levels for mechanical stimulation of 32 prosthetic limbs were determined. Prosthetic limbs were anchored to the bone by means of an implant (n=17) or supported by a socket enclosing the amputation stump (n=15). Detection threshold levels were assessed for pressure and vibratory stimulation of the prosthesis and the limb at the contralateral side (control). Following vibratory stimulation, thresholds were increased on an avarage 20% for socket prostheses, but approached those of the control for bone-anchored prostheses. For pressure stimulation, thresholds were increased up to 60% for socket prostheses and 40% for bone-anchored prostheses compared to the control. While bone-anchored prostheses yielded significantly lower threshold levels than socket prostheses, there was no significant difference between both treatments regarding pressure stimulation. Results were applicable to both upper and lower limb amputees. It could be concluded that detection thresholds for pressure and especially vibratory stimulation of prosthetic limbs were generally higher than for control limbs. The outcome was related to the prosthetic limb design with bone-anchored prostheses yielding better perception than socket prostheses.

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“…examples include sign language for the deaf, and Braille for the blind." Kaczmarek et al (1991) present a good overview of the various factors that need to be considered for sensory substitution systems; these were taken into account when designing our system. Prior research has found that providing haptic feedback will improve a user's task training performance in a virtual environment.…”

Section: Related Workmentioning

confidence: 99%

Virtual Training via Vibrotactile Arrays

Bloomfield

Badler

2008

Presence: Teleoperators and Virtual Environments

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What is often missing from many virtual worlds and training simulations is a physical sense of the confinement and constraint of the virtual environment. We present a method for providing localized cutaneous vibratory feedback to the user's right arm. We created a sleeve of tactors linked to a real-time human model; the tactors activate to apply sensation to the corresponding body area. The hypothesis is that vibrotactile feedback to body areas provides the wearer sufficient guidance to assume correct body configurations and ascertain the existence and physical realism of access paths. We present the results of human subject experiments that study both explicit and implicit training of skills using vibrotactile arrays. Implicitly, collision awareness is achieved by activating the appropriate tactor when a body part collides with the scene; thus, the user will attempt to correct his or her body configuration. Explicitly, we use the tactors to guide the body into the proper configuration. The results of human subject experiments clearly show that the use of full arm vibrotactile feedback improves performance over purely visual feedback for navigating the virtual environment, as well as allowing easy acquisition of new skills. These results validate the empirical performance of this concept. Disciplines Computer Sciences | Physical Sciences and Mathematics Comments Virtual Training via Vibrotactile Arrays AbstractWhat is often missing from many virtual worlds and training simulations is a physical sense of the confinement and constraint of the virtual environment. We present a method for providing localized cutaneous vibratory feedback to the user's right arm. We created a sleeve of tactors linked to a real-time human model; the tactors activate to apply sensation to the corresponding body area. The hypothesis is that vibrotactile feedback to body areas provides the wearer sufficient guidance to assume correct body configurations and ascertain the existence and physical realism of access paths. We present the results of human subject experiments that study both explicit and implicit training of skills using vibrotactile arrays. Implicitly, collision awareness is achieved by activating the appropriate tactor when a body part collides with the scene; thus, the user will attempt to correct his or her body configuration. Explicitly, we use the tactors to guide the body into the proper configuration. The results of human subject experiments clearly show that the use of full arm vibrotactile feedback improves performance over purely visual feedback for navigating the virtual environment, as well as allowing easy acquisition of new skills. These results validate the empirical performance of this concept.

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Electrotactile and vibrotactile displays for sensory substitution systems

Cited by 693 publications

References 91 publications

Myoelectric forearm prostheses: State of the art from a user-centered perspective

Myoelectric forearm prostheses: State of the art from a user-centered perspective

Evaluation of the psychophysical detection threshold level for vibrotactile and pressure stimulation of prosthetic limbs using bone anchorage or soft tissue support

Virtual Training via Vibrotactile Arrays

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