Crossing your arms relieves pain

(Medical Xpress) -- Crossing your arms reduces the intensity of pain you feel when receiving a painful stimulus on the hand, according to research by scientists at University College London.

Published in the current issue of the journal , the research shows that crossing your over the midline (an imaginary line running vertically down the centre of the body) confuses the brain and reduces the intensity of the .

Scientists believe that the reason for this is due to conflicting information between two of the brain’s maps – the one for you body and the one for external space.

As your left hand usually performs actions on the left side of space (and vice-versa for the right side), these two maps are used to working together to produce strong impulses in response to stimuli. When our arms are crossed, the two maps are mismatched and processing of noxious information is weakened – resulting in less pain.

“Perhaps when we get hurt, we should not only “rub it better” but also cross our arms,” said Dr. Giandomenico Iannetti, lead author of the paper from the UCL department of Physiology, Pharmacology and Neuroscience.

In the study, scientists used a laser to generate a four millisecond pin prick of “pure pain” – i.e. pain without touch - on the hands of a small group of eight participants, which was repeated with the arms crossed. Participants rated their perception of the intensity of the pain, and their electrical brain responses were also measured using electroencephalography (EEG).

The results from both participants’ reports and the EEG showed that the perception of pain was weaker when the arms were crossed.

Dr. Iannetti explains: “In everyday life you mostly use your left hand to touch things on the left side of the world, and your right hand for the right side of the world – for example when picking up a glass of water on your right side you generally use your right hand.

“This means that the areas of the brain that contain the map of the right body and the map of right external space are usually activated together, leading to highly effective processing of sensory stimuli. When you cross your arms these maps are not activated together anymore, leading to less effective brain processing of sensory stimuli, including pain, being perceived as weaker.”

According to the researchers, this new discovery could lead to new innovative clinical therapies to reduce pain that exploit the ’s way of representing the body. 


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More information: Journal article in PAIN
Citation: Crossing your arms relieves pain (2011, May 20) retrieved 17 September 2019 from https://medicalxpress.com/news/2011-05-arms-relieves-pain.html
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May 20, 2011
What about people with deeper chronic pains in the hips, shoulders, or the head? Try emotional freedom techniques!

May 21, 2011
The cerebellum, which is responsible for much of the control of our limbs, does not cross left and right ie the left side of the cerebellum controls the left side of the body (ipsilateral). These researchers didn't know that?

May 23, 2011
@Robert: Even then, wouldn't the left side of the cerebullum be confused when confronted with the right hand space and vice versa?

May 23, 2011
Secondly, this is only valid when the stimulus or rather pain point is one of the hands right?
Somebody plz correct me if I am wrong.

May 26, 2011
@abhishekbt: I just wanted to dispel the myth eg olfaction is ipsilateral (same side). Sometimes people get a bit carried away and say that everything crosses ~ it doesn't :)

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