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Evidence for distorted mental representation of the hand in osteoarthritis.

Gilpin HR, Moseley GL, Stanton TR, Newport R - Rheumatology (Oxford) (2014)

Bottom Line: Some chronic pain states are associated with a distortion of the perceived size or shape of the painful area, and multisensory illusions that disrupt these dimensions can modulate pain in healthy controls and people with painful disorders.Illusory hand resizing has recently been found to relieve pain in hand OA, raising the possibility that the illusion corrects some underlying perceptual disturbance.These results suggest that hand OA is associated with a distorted mental representation of the painful hand and are consistent with the idea that the pain relief offered by multisensory illusions may work via normalization of this distortion.

View Article: PubMed Central - PubMed

Affiliation: Sansom Institute for Health Research, University of South Australia, PainAdelaide, Adelaide, Australia, School of Psychology, University of Nottingham, Nottingham, UK and Neuroscience Research Australia, Sydney, Australia. Sansom Institute for Health Research, University of South Australia, PainAdelaide, Adelaide, Australia, School of Psychology, University of Nottingham, Nottingham, UK and Neuroscience Research Australia, Sydney, Australia. Sansom Institute for Health Research, University of South Australia, PainAdelaide, Adelaide, Australia, School of Psychology, University of Nottingham, Nottingham, UK and Neuroscience Research Australia, Sydney, Australia.

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Effect of illusion and group on hand length estimatesExample of arthritic hand after being shrunk, stretched and after no illusion. Mean hand length estimates as a function of group (OA, controls) and illusory condition (shrink, no illusion, stretch). Error bars indicate ±1 s.e.
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keu367-F1: Effect of illusion and group on hand length estimatesExample of arthritic hand after being shrunk, stretched and after no illusion. Mean hand length estimates as a function of group (OA, controls) and illusory condition (shrink, no illusion, stretch). Error bars indicate ±1 s.e.

Mentions: The stretch and shrink illusions were created using a Newport MIRAGE multisensory illusions system [9], which allows participants to view live video images of their hands in the same spatial location and from the same perspective as if directly viewing their hands (see supplementary Fig. S1, available at Rheumatology Online). The illusion [9] involved the participant seeing the live video image of their hand being lengthened or shortened (see Fig. 1), while simultaneously seeing and feeling the experimenter gently pulling (for the stretch illusion) or pushing (for the shrink illusion) on their hand. Participants undertook two experimental conditions (stretch and shrink) and a control condition (no illusion) and the order was randomized and counterbalanced across participants. For the OA group, the experimental hand was their most painful hand. For the control group, the experimental hand was their dominant hand.Fig. 1


Evidence for distorted mental representation of the hand in osteoarthritis.

Gilpin HR, Moseley GL, Stanton TR, Newport R - Rheumatology (Oxford) (2014)

Effect of illusion and group on hand length estimatesExample of arthritic hand after being shrunk, stretched and after no illusion. Mean hand length estimates as a function of group (OA, controls) and illusory condition (shrink, no illusion, stretch). Error bars indicate ±1 s.e.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4372676&req=5

keu367-F1: Effect of illusion and group on hand length estimatesExample of arthritic hand after being shrunk, stretched and after no illusion. Mean hand length estimates as a function of group (OA, controls) and illusory condition (shrink, no illusion, stretch). Error bars indicate ±1 s.e.
Mentions: The stretch and shrink illusions were created using a Newport MIRAGE multisensory illusions system [9], which allows participants to view live video images of their hands in the same spatial location and from the same perspective as if directly viewing their hands (see supplementary Fig. S1, available at Rheumatology Online). The illusion [9] involved the participant seeing the live video image of their hand being lengthened or shortened (see Fig. 1), while simultaneously seeing and feeling the experimenter gently pulling (for the stretch illusion) or pushing (for the shrink illusion) on their hand. Participants undertook two experimental conditions (stretch and shrink) and a control condition (no illusion) and the order was randomized and counterbalanced across participants. For the OA group, the experimental hand was their most painful hand. For the control group, the experimental hand was their dominant hand.Fig. 1

Bottom Line: Some chronic pain states are associated with a distortion of the perceived size or shape of the painful area, and multisensory illusions that disrupt these dimensions can modulate pain in healthy controls and people with painful disorders.Illusory hand resizing has recently been found to relieve pain in hand OA, raising the possibility that the illusion corrects some underlying perceptual disturbance.These results suggest that hand OA is associated with a distorted mental representation of the painful hand and are consistent with the idea that the pain relief offered by multisensory illusions may work via normalization of this distortion.

View Article: PubMed Central - PubMed

Affiliation: Sansom Institute for Health Research, University of South Australia, PainAdelaide, Adelaide, Australia, School of Psychology, University of Nottingham, Nottingham, UK and Neuroscience Research Australia, Sydney, Australia. Sansom Institute for Health Research, University of South Australia, PainAdelaide, Adelaide, Australia, School of Psychology, University of Nottingham, Nottingham, UK and Neuroscience Research Australia, Sydney, Australia. Sansom Institute for Health Research, University of South Australia, PainAdelaide, Adelaide, Australia, School of Psychology, University of Nottingham, Nottingham, UK and Neuroscience Research Australia, Sydney, Australia.

Show MeSH
Related in: MedlinePlus