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https://www.readbyqxmd.com/read/29764303/relief-from-intractable-phantom-pain-by-combining-psilocybin-and-mirror-visual-feedback-mvf
#1
Vilayanur Ramachandran, Chaipat Chunharas, Zeve Marcus, Timothy Furnish, Albert Lin
AL's leg was amputated resulting in phantom-limb pain (PLP). (1) When a volunteer placed her foot on or near the phantom - touching it evoked organized sensations in corresponding locations on AL's phantom. (2) Mirror-visual-feedback (MVF) relieved PLP, as did, "phantom massage". (3) Psilocybin-MVF pairing produced synergistic effects, complete elimination of PLP, and reduction in paroxysmal episodes. (4) Touching the volunteer's leg where AL previously had external fixators, evoked sensation of nails boring through the leg...
May 15, 2018: Neurocase
https://www.readbyqxmd.com/read/29708416/disillusionment-and-suicidality-when-a-developmental-necessity-becomes-a-clinical-challenge
#2
Jane G Tillman
Both illusion and disillusion play an important role in development, fostering processes of going-on-being and separation (Winnicott 1960). The capacity to bear disillusionment is both a developmental necessity and an ongoing challenge. Disillusionment penetrates the sphere of illusion and invites the individual into an expanded encounter with shared realities. But when disillusionment becomes chronic and pervasive or is accompanied by severe psychic pain, then suicide is felt by some to be an urgent option for refusing or escaping this pain...
April 2018: Journal of the American Psychoanalytic Association
https://www.readbyqxmd.com/read/29700407/ineffectiveness-of-tactile-gating-shows-cortical-basis-of-nociceptive-signaling-in-the-thermal-grill-illusion
#3
E R Ferrè, G D Iannetti, J A van Dijk, P Haggard
Painful burning sensations can be elicited by a spatially-alternating pattern of warm and cold stimuli applied on the skin, the so called "Thermal Grill Illusion" (TGI). Here we investigated whether the TGI percept originates spinally or centrally. Since the inhibition of nociceptive input by concomitant non-nociceptive somatosensory input has a strong spinal component, we reasoned that, if the afferent input underlying the TGI originates at spinal level, then the TGI should be inhibited by a concomitant non-nociceptive somatosensory input...
April 26, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29624596/embodied-pain-in-fibromyalgia-disturbed-somatorepresentations-and-increased-plasticity-of-the-body-schema
#4
Endika Martínez, Zigor Aira, Itsaso Buesa, Ibane Aizpurua, Diego Rada, Jon Jatsu Azkue
Fibromyalgia syndrome (FMS) is a highly prevalent, chronic musculoskeletal condition characterized by widespread pain and evoked pain at tender points. This study evaluated various aspects of body awareness in a sample of 14 women with FMS and 13 healthy controls, such as plasticity of the body schema, body esteem, and interoceptive awareness. To this end, the Rubber Hand Illusion (RHI), the Body Esteem Scale (BES), and the Body Perception Questionnaire (BPQ) were used, respectively. Consistent with increased plasticity of the body schema, FMS patients scored higher, with large or very large effect sizes, across all three domains evaluated in the RHI paradigm, namely proprioceptive drift and perceived ownership and motor control over the rubber hand...
2018: PloS One
https://www.readbyqxmd.com/read/29551734/removing-own-limb-visual-input-using-mixed-reality-mr-produces-a-telescoping-illusion-in-healthy-individuals
#5
Mikkel Thøgersen, John Hansen, Lars Arendt-Nielsen, Herta Flor, Laura Petrini
The purpose of the present study was to assess changes in body perception when visual feedback was removed from the hand and arm with the purpose of resembling the visual deprivation arising from amputation. The illusion was created by removing the visual feedback from the participants' own left forearm using a mixed reality (MR) and green screen environment. Thirty healthy persons (15 female) participated in the study. Each subject experienced two MR conditions, one with and one without visual feedback from the left hand, and a baseline condition with normal vision of the limb (no MR)...
March 15, 2018: Behavioural Brain Research
https://www.readbyqxmd.com/read/29529588/atypical-susceptibility-to-the-rubber-hand-illusion-linked-to-sensory-localised-vicarious-pain-perception
#6
V Botan, S Fan, H Critchley, J Ward
The Rubber Hand Illusion (RHI) paradigm has been widely used to investigate the sense of body ownership. People who report experiencing the pain of others are hypothesised to have differences in computing body ownership and, hence, we predicted that they would perform atypically on the RHI. The Vicarious Pain Questionnaire (VPQ), was used to divide participants into three groups: (1) non-responders (people who report no pain when seeing someone else experiencing physical pain), (2) sensory-localised responders (report sensory qualities and a localised feeling of pain) and (3) affective-general responders (report a generalised and emotional feeling of pain)...
March 9, 2018: Consciousness and Cognition
https://www.readbyqxmd.com/read/29407592/spontaneous-imitative-movements-induced-by-an-illusory-embodied-fake-hand
#7
Satoshi Shibuya, Satoshi Unenaka, Takuro Zama, Sotaro Shimada, Yukari Ohki
In the rubber hand illusion (RHI), individuals perceive a fake hand as their own when the hidden real hand and visible fake hand are synchronously stroked. Several RHI studies have reported that visual manipulation of the embodied fake hand inversely affects the perceptual processing of the observer's own hand (e.g., thermal or pain sensitivity). In this study, we examined whether motor manipulation of the fake hand similarly affects the observer's motor system. Our study employed a novel RHI paradigm wherein stroking was interrupted by unexpected movement of the fake hand (i...
March 2018: Neuropsychologia
https://www.readbyqxmd.com/read/29260349/neural-mechanisms-of-attentional-switching-between-pain-and-a-visual-illusion-task-a-laser-evoked-potential-study
#8
Andrej Stancak, Nicholas Fallon, Alessandra Fenu, Katerina Kokmotou, Vicente Soto, Stephanie Cook
Previous studies demonstrated that pain induced by a noxious stimulus during a distraction task is affected by both stimulus-driven and goal-directed processes which interact and change over time. The purpose of this exploratory study was to analyse associations of aspects of subjective pain experience and engagement with the distracting task with attention-sensitive components of noxious laser-evoked potentials (LEPs) on a single-trial basis. A laser heat stimulus was applied to the dorsum of the left hand while subjects either viewed the Rubin vase-face illusion (RVI), or focused on their pain and associated somatosensory sensations occurring on their stimulated hand...
December 19, 2017: Brain Topography
https://www.readbyqxmd.com/read/28986411/virtual-reality-improves-embodiment-and-neuropathic-pain-caused-by-spinal-cord-injury
#9
RANDOMIZED CONTROLLED TRIAL
Polona Pozeg, Estelle Palluel, Roberta Ronchi, Marco Solcà, Abdul-Wahab Al-Khodairy, Xavier Jordan, Ammar Kassouha, Olaf Blanke
OBJECTIVE: To investigate changes in body ownership and chronic neuropathic pain in patients with spinal cord injury (SCI) using multisensory own body illusions and virtual reality (VR). METHODS: Twenty patients with SCI with paraplegia and 20 healthy control participants (HC) participated in 2 factorial, randomized, repeated-measures design studies. In the virtual leg illusion (VLI), we applied asynchronous or synchronous visuotactile stimulation to the participant's back (either immediately above the lesion level or at the shoulder) and to the virtual legs as seen on a VR head-mounted display...
October 31, 2017: Neurology
https://www.readbyqxmd.com/read/28864079/rubber-hand-illusion-increases-pain-caused-by-electric-stimuli
#10
Marta Siedlecka, Nadine Spychała, Marta Łukowska, Karolina Wiercioch, Michał Wierzchoń
The rubber hand illusion (RHI) has been shown to alter the experience of pain, although studies have yielded inconsistent results. In this experiment we tested the influence of the RHI on the intensity of pain caused by electric stimuli. Electric stimuli were delivered to participants' experimental and control hands before RHI induction (control condition) and afterward (experimental condition), in a procedure that was double-blind with respect to location and strength of noxious stimulation. All hands were covered during the stimulation to avoid the analgesic effect of seeing one's own body part...
January 2018: Journal of Pain: Official Journal of the American Pain Society
https://www.readbyqxmd.com/read/28859684/sex-differences-in-thermal-detection-and-thermal-pain-threshold-and-the-thermal-grill-illusion-a-psychophysical-study-in-young-volunteers
#11
Beate Averbeck, Lena Seitz, Florian P Kolb, Dieter F Kutz
BACKGROUND: Sex-related differences in human thermal and pain sensitivity are the subject of controversial discussion. The goal of this study in a large number of subjects was to investigate sex differences in thermal and thermal pain perception and the thermal grill illusion (TGI) as a phenomenon reflecting crosstalk between the thermoreceptive and nociceptive systems. The thermal grill illusion is a sensation of strong, but not necessarily painful, heat often preceded by transient cold upon skin contact with spatially interlaced innocuous warm and cool stimuli...
September 1, 2017: Biology of Sex Differences
https://www.readbyqxmd.com/read/28768538/pulsed-radiofrequency-or-anterior-neurectomy-for-anterior-cutaneous-nerve-entrapment-syndrome-acnes-the-pulse-trial-study-protocol-of-a-randomized-controlled-trial
#12
Robbert C Maatman, Monique A H Steegers, Oliver B A Boelens, Toine C Lim, Hans J van den Berg, Sandra A S van den Heuvel, Marc R M Scheltinga, Rudi M H Roumen
BACKGROUND: Some patients with chronic abdominal pain suffer from an anterior cutaneous nerve entrapment syndrome (ACNES). This somewhat illusive syndrome is thought to be caused by the entrapment of end branches of the intercostal nerves residing in the abdominal wall. If ACNES is suspected, a local injection of an anesthetic agent may offer relief. If pain is recurrent following multiple-injection therapy, an anterior neurectomy entailing removal of the entrapped nerve endings may be considered...
August 2, 2017: Trials
https://www.readbyqxmd.com/read/28744055/the-influence-of-trait-anxiety-and-illusory-kinesthesia-on-pain-threshold
#13
Ryota Imai, Michihiro Osumi, Tomoya Ishigaki, Shu Morioka
[Purpose] It has also been reported that decreased activity in the reward pathway causes a decrease in brain activity in the descending pain control system in people with high trait anxiety. Activation of this system is dependent on both the reward pathway and motor areas. Recently, studies have also shown that motor areas are activated by illusory kinesthesia. It was aimed to explore whether anxiety trait modulates the influence of illusory kinesthesia on pain threshold. [Subjects and Methods] The pain threshold and trait anxiety at rest before vibratory tendon stimulation (the task) were measured...
July 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28690901/use-of-cone-beam-computed-tomography-in-the-diagnosis-and-treatment-of-an-unusual-canine-abnormality
#14
Archana Gopalakrishnan, K Unnikrishna, Anita Balan, P S Haris
Diagnosis and treatment planning are important for successful endodontic treatment. We report a 24-year old male who presented to the Government Dental College in Kozhikode, Kerala, India, in 2015 with pain in his right upper canine. A digital periapical radiograph indicated the presence of a supernumerary tooth superimposing the root of the canine. However, cone-beam computed tomography (CBCT) confirmed that the supernumerary tooth was an illusion and that the canine root had a sharp invagination involving the labial and pulpal dentin surfaces, with evidence of periapical bone destruction...
May 2017: Sultan Qaboos University Medical Journal
https://www.readbyqxmd.com/read/28644200/electrical-stimulations-of-the-human-insula-their-contribution-to-the-ictal-semiology-of-insular-seizures
#15
Laure Mazzola, François Mauguière, Jean Isnard
INTRODUCTION: Stereotactic stimulations of the insular cortex through intracranial electrodes aim at characterizing the semiology of insular seizures. These stimulations, carried out in the context of Stereo-Electro-Encephalography (SEEG) during presurgical monitoring of epilepsy, reproduce the ictal symptoms observed during the development of insular seizures. METHODS: The authors reviewed the results of insular stimulations performed in 222 patients admitted between 1997 and 2015 for presurgical SEEG exploration of atypical temporal or perisylvian epilepsy...
July 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28573748/conditioned-pain-modulation-dampens-the-thermal-grill-illusion
#16
D E Harper, M Hollins
BACKGROUND: The thermal grill illusion (TGI) refers to the perception of burning heat and often pain that arises from simultaneous cutaneous application of innocuous warm and cool stimuli. This study utilized conditioned pain modulation (CPM) to help elucidate the TGI's underlying neural mechanisms, including the debated role of ascending nociceptive signals in generating the illusion. METHODS: To trigger CPM, subjects placed the left hand in noxious cold (6 °C) water before placing the right volar forearm onto a thermal grill...
June 2, 2017: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/28455248/placebo-analgesia-from-a-rubber-hand
#17
Matthew J Coleshill, David N George, Giuliana Mazzoni
Placebo analgesia, reductions in pain after administration of an inert treatment, is a well documented phenomenon. We report, to our knowledge, the first demonstration that placebo analgesia can be experienced when a sham analgesic is applied onto a rubber hand. The effect was obtained by exploiting the rubber hand illusion, in which ownership is felt over a rubber arm that is unattached to the body. Under conditions of synchronous as well as asynchronous visuotactile stimulation, a thermal pain stimulus was delivered on the real arm of 20 participants and seemingly also on the rubber arm, before and after applying a sham analgesic and a control cream only to the rubber arm...
September 2017: Journal of Pain: Official Journal of the American Pain Society
https://www.readbyqxmd.com/read/28318305/on-demand-driver-vigilance-enhancement-without-explicit-drowsiness-detection-further-analysis-of-the-pilot-study-results
#18
R Michael Van Auken, Brad K Hagoski, Dean P Chiang, Shane Chang
OBJECTIVE: A new active safety concept that engages the driver's psychosensory pain-processing mechanism to automatically trigger vigilance enhancement on-demand was proposed in Chang (2012). This concept is based on the hypothesis that a human's pain threshold will decline as he or she becomes drowsy, consequently triggering the vigilance enhancer. The objective of this pilot study was to develop methods to test this hypothesis, the results of which could lead to further refinement of the hypothesis and methods, with the ultimate goal of developing new active safety concepts that exploit the driver's endogenous psychosensory pain-processing mechanisms...
May 29, 2017: Traffic Injury Prevention
https://www.readbyqxmd.com/read/28294069/wallet-neuritis-an-example-of-peripheral-sensitization
#19
Md Abu Bakar Siddiq, Israt Jahan, Sam Masihuzzaman
BACKGROUND: Wallet neuritis is an example of extra-spinal tunnel neuropathy concerning sciatic nerve. Its clinical appearance often gets confused with sciatica of lumbar spine origin. Wallet-induced chronic sciatic nerve constriction produces gluteal and ipsilateral lower extremity pain, tingling, and burning sensation. It was Lutz, first describing credit-card wallet sciatica in an Attorney, surfaced on Journal of American Medical Association (JAMA), 1978; however, the condition has not been well-studied in various other occupations...
March 9, 2017: Current Rheumatology Reviews
https://www.readbyqxmd.com/read/28284239/integrating-self-localization-proprioception-pain-and-performance
#20
REVIEW
Valeria Bellan, Sarah B Wallwork, Alberto Gallace, Charles Spence, G Lorimer Moseley
The ability to know where our own body and body parts are in space is often taken for granted, yet it is of fundamental importance for the majority of our everyday activities, let alone high performance activities such as dancing. This review focuses on the concept of self-localization, the monitoring of the space surrounding one's body, and the disruptions that occur in the presence of pain. A conceptual model is presented of the cortical body matrix with which to consider self-localization; also provided are its historical context, underlying assumptions, and current limitations...
March 1, 2017: Journal of Dance Medicine & Science
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