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People with autism experience pain at a higher intensity

Autism

A new study conducted by Israeli researchers from Tel Aviv University and the Technion determined that people on the autism spectrum experience pain at a higher intensity than the general population and are less adaptable to the sensation. The researchers said this finding is contrary to the prevalent belief that people with autism are supposedly “indifferent to pain.”

Autism is better understood these days. People now tend to know what it means when someone is described as being “on the spectrum.” There have also been a number of television shows that provide the general public with portrayals of how people with autism experience the world, with one even called “On the Spectrum.” These programs tend to portray the autistic as being kind of like Data on Star Trek in that they do not experience the world in the same way as most and are more lie observers to human behavior who have trouble understanding why people do what they do.

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The study was funded by the Israel Science Foundation, and was led by four researchers: Dr. Tami Bar-Shalita of the Sackler Faculty of Medicine at Tel Aviv University who initiated the study, in collaboration with Dr. Yelena Granovsky of the Technion and Rambam Medical Center, and Prof. Irit Weissman-Fogel and Prof. Eynat Gal of the University of Haifa. This study constitutes a framework for the theses of PhD students Tzeela Hofmann and Mary Klingel-Levy, and three articles based on it have already been published or approved for publishing. The present study has been published in the prestigious PAIN journal.

Dr. Bar-Shalita explains: “approximately 10% of the general population suffer from sensory modulation dysfunction, which means sensory hypersensitivity at a level that compromises normal daily functioning and quality of life. These people have difficulty, for example, ignoring or adapting to buzzing or flickering of fluorescent lights, humming of air conditioners or fans, or the crunching of popcorn by someone sitting next to them in the cinema. In previous studies in the lab we found that these people suffer from pain more than those without sensory modulation dysfunction. Since it is known that sensory modulation dysfunction occurs in people with autism at a rate of 70-90%, it constitutes a criterion for diagnosing autism, and is associated with its severity. We were interested in exploring pain perception in autism, so we asked: do people with autism hurt more than the general population? This question was hardly studied in the lab before we got started.”

According to the researchers, for many years the prevalent opinion was that ‘people with autism hurt less’ or that they were ‘indifferent to pain’. Actually, ‘indifference to pain’ is one of the characteristics presented in the current diagnostic criteria of autism. The proof of this was, supposedly, their tendency to inflict pain on themselves by self-harm. Dr. Bar-Shalita: “this assumption is not necessarily true. We know that self-harm could stem from attempts to suppress pain, and it could be that they hurt themselves in order to activate, unconsciously, a physical mechanism of ‘pain inhibits pain’.”

This study is a laboratory pain study approved by the ethics committee of the academic institutions and Rambam Medical Center. The study included 52 adults with high-functioning autism (HFA) and normal intelligence – hitherto the largest reported sample in the world in studies on pain among people with autism. The study made use of psychophysical tests to evaluate pain, commonly used in the area of pain study. These methods examine the link between stimulus and response, while the researcher, using a computer, controls the duration and intensity of stimulus and the examinee is asked to rank the intensity of the pain felt by him on a scale of 0 to 100. The findings have proven beyond doubt that people with autism hurt more. Furthermore, their pain suppression mechanism is less effective.

The researchers: “we conducted a variety of measurements, aimed among other things at examining whether the hypersensitivity to pain derives from a sensitized nervous system or from suppression of mechanisms that are supposed to enable adjustment and, over time, reduce the response to the stimulus. We found that in the case of people with autism, it is a combination of the two: an increase of the pain signal along with a less effective pain inhibition mechanism.”

Dr. Bar-Shalita concludes: “our study constituted a comprehensive, in-depth study of the intensity of pain experienced by people with autism. The prevalent belief was that they are supposedly ‘indifferent to pain’, and there are reports that medical and other professional staff treated them accordingly. The results of our study indicate that in most cases, the sensitivity to pain of people with autism is actually higher than that of most of the population, while at the same time they are unsuccessful at effectively suppressing painful stimuli. We hope that our findings will benefit the professionals and practitioners handling this population, and contribute to the advancement of personalized treatment.”

The researchers expressed the hope that the findings of their study will lead to more appropriate treatment on the part of medical staff, caregivers, and parents toward people with autism, who do not always express the experience of pain in the usual way.

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