scholarly journals Visual Capture of a Tactile Sensation is Influenced by Repeated, Structured Exposure of a Visual Stimulus in Virtual Reality

2021 ◽  
Vol 2 ◽  
Author(s):  
Dion Willis ◽  
Brett Stevens ◽  
Wendy Powell

Phantom limb pain is commonly known as a neurological condition, where an amputee will continue to feel a limb that is no longer present in a painful fashion. Virtual mirror therapy (VMT) has been suggested as a method for alleviating phantom limb pain. The inclusion of tactile sensation in VMT has shown to be beneficial; however, delivering a tactile sensation to a phantom limb, without the use of invasive procedures, can be difficult. The current approach for transferring a tactile sensation to a phantom limb is called visual capture. The ability to establish visual capture has been demonstrated in VMT applications. However, there is little research into whether an established visual capture effect can be relocated to a more distal location for phantom limb pain management. This paper investigates whether a passive vibrotactile sensation can be moved to a distal location from its veridical location using a series of distally located lights presented in either a random or a structured fashion. Eight non-amputee participants were tasked with localising a static tactile sensation on a virtual arm. These vibrotactile sensations were presented simultaneously with a visual light stimulus, either co-located or located distally at three different locations. Findings show that a tactile sensation without a visual stimulus was difficult for participants to localise; however, when a visual stimulus was added, they were better able to locate the veridical tactile position. The structured group exhibited a larger range of tactile relocation responses than the random group. However, this result was unreliable, with the majority of the responses situated at the vibrotactile actuator. There was a significant difference between the random and structured group’s ability to retain a visual capture at the veridical vibrotactile location when the lights were located distally. The random group did not express a visual capture response when the lights were presented distally while the structured group did, suggesting the structured group developed a more robust association between the visual stimulus and the vibrotactile stimulus. Findings may be of use where increasing tactile acuity without significant alteration of a veridical location is a desired therapeutic outcome.

Author(s):  
BAHAR KÜLÜNKOĞLU ◽  
FATİH ERBAHÇECİ ◽  
Afra ALKAN

Background and aim: Although mirror therapy (MT) and phantom exercises (PE) have been shown to reduce pain, the efficacy of these methods in terms of pain, quality of life (QoL) and psychological status (PS) has not been investigated and compared to date. The aim of this study was to determine whether there is any difference between MT and PE in the treatment of phantom limb pain (PLP). Materials and methods: Forty unilateral transtibial amputees (aged 18-45 YR) participated in this study. Subjects were randomly divided into ‘MT group’ and ‘PE group’. QoL was assessed using Short-Form 36 (SF-36), psychological status using the Beck Depression Inventory (BDI) and pain intensity using a Visual Analog Scale (VAS), before and at the end of the program, and on the 3rd and 6th months thereafter. Results: All assessments for all parameters improved significantly in both groups (p<0.05). Comparison of the two groups revealed a significant difference in changes for VAS and BDI in all measurements, and in pre- and post-treatment scores for all SF-36 parameters (except for Role-Emotional) in favor of MT group (p<0.05). Conclusion: While pain intensity decreased and QoL and PS improved in both MT and PE groups, these improvements were greater in the MT group. Keywords: Mirror therapy, Phantom exercises, Phantom limb pain, Physiotherapy, Rehabilitation


2006 ◽  
Author(s):  
Cheree L. Nichole ◽  
William G. Johnson

1996 ◽  
Author(s):  
P. Montoya ◽  
N. Birbaumer ◽  
W. Lutzenberger ◽  
H. Flor ◽  
W. Grodd ◽  
...  

2007 ◽  
Author(s):  
David H. Peterzell ◽  
Roberta E. Cone ◽  
Christian Carter ◽  
Alexandrea Harmell ◽  
Judy Ortega ◽  
...  

2021 ◽  
pp. 1-10
Author(s):  
Michihiro Osumi ◽  
Daisuke Shimizu ◽  
Yuki Nishi ◽  
Shu Morioka

Background: Patients with brachial plexus avulsion (BPA) usually experience phantom sensations and phantom limb pain (PLP) in the deafferented limb. It has been suggested that evoking the sensation of touch in the deafferented limb by stimulating referred sensation areas (RSAs) on the cheek or shoulder might alleviate PLP. However, feasible rehabilitation techniques using this approach have not been reported. Objective: The present study sought to examine the analgesic effects of simple electrical stimulation of RSAs in BPA patients with PLP. Methods: Study 1: Electrical stimulation of RSAs for 60 minutes was conducted for six BPA patients suffering from PLP to examine short-term analgesic effects. Study 2: A single case design experiment was conducted with two BPA patients to investigate whether electrical stimulation of RSAs was more effective for alleviating PLP than control electrical stimulation (electrical stimulation of sites on side opposite to the RSAs), and to elucidate the long-term effects of electrical stimulation of RSAs. Results: Study 1: Electrical stimulation of RSAs evoked phantom touch sensations in the deafferented limb, and significantly alleviated PLP (p <  0.05). Study 2: PLP was alleviated more after electrical stimulation on RSAs compared with control electrical stimulation (p <  0.05). However, the analgesic effects of electrical stimulation on RSAs were observed only in the short term, not in the long term (p >  0.05). Conclusions: Electrical stimulation of RSAs not only evoked phantom touch sensation but also alleviated PLP in the short term. The results indicate that electrical stimulation of RSAs may provide a useful practical rehabilitation technique for PLP. Future studies will be required to clarify the mechanisms underlying immediate PLP alleviation via electrical stimulation of RSAs.


Toxicon ◽  
2021 ◽  
Author(s):  
Arunmozhimaran Elavarasi ◽  
Vinay Goyal

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