Autism Spectrum Disorder (ASD) is traditionally described by deficits in social communication and repetitive behaviors, but sensory alterations—especially in the processing of thermal stimuli—have gained increasing scientific and clinical relevance. In the article “Decreased Sensitivity to Thermal Stimuli in Adolescents With Autism Spectrum Disorder: Relation to Symptomatology and Cognitive Ability,” Duerden et al. (2015) rigorously investigate how adolescents with ASD process thermal stimuli, comparing them with typically developing peers. The study sheds light on an often-overlooked facet of the autism spectrum: the atypical modulation of thermal sensitivity.
Using a standardized quantitative sensory testing (QST) protocol, the authors found that adolescents with ASD have significantly higher thresholds for heat detection and lower thresholds for cold detection—i.e., thermal hyposensitivity to non-noxious stimuli. Interestingly, thermal pain thresholds (heat or painful cold) did not differ significantly between the groups. This functional dissociation suggests that sensory alterations in ASD may be more closely linked to the perception of subtle stimuli than to nociception per se (Duerden et al., 2015).
The findings are particularly relevant because they point to possible underlying neurobiological mechanisms. Heat perception involves specific unmyelinated C fibers, while thermal pain involves polymodal C and A-delta nociceptors. The functional integrity of the former may be compromised in ASD, without necessarily affecting nociceptive pathways. This could indicate a peripheral reorganization of sensory systems or central alterations in somatosensory cortical areas, as suggested by previous studies correlating cortical thickness with thermal perception in individuals with autism (Duerden et al., 2015).
One point that caught my attention was the correlation between cognitive performance (measured by IQ) and thermal thresholds in adolescents with ASD. Higher thresholds were associated with lower IQ scores, suggesting that attention deficits and perceptual processing difficulties may mediate, at least in part, these sensory alterations. However, since pain thresholds did not follow the same correlation, it is plausible that there are physiological mechanisms independent of cognitive functioning interfering with thermal perception (Duerden et al., 2015).
Even more intriguing was the report of paradoxical thermal sensations by 30% of adolescents with ASD—they described the sensation of extreme cold as a burning heat pain. This rare phenomenon in neurotypical populations (approximately 0.6% of adults) may indicate dysfunctions in C-fiber sensory integration, possibly due to central disinhibition or peripheral afferent reorganization. This hypothesis opens interesting avenues for further neurophysiological investigation (Duerden et al., 2015).
From a clinical perspective, the data reinforce the need for more careful assessment of pain and discomfort sensitivity in individuals with ASD. Hyporesponsiveness can mask relevant clinical symptoms, hindering diagnosis and appropriate pain management, especially in patients with language or cognitive deficits. Implementing objective sensory tests, such as the QST, can contribute to more sensitive and individualized clinical practices.
The study also highlights recurring methodological limitations in research with neurodivergent populations. For example, the authors acknowledge that the assessment method used—method of limits—relies on participants’ reaction time, which can be influenced by cognitive factors such as attention and comprehension. The lack of IQ assessment in typical adolescents also limits the interpretation of some comparisons. Despite this, the results are robust, replicating even in analyses with samples matched by age, sex, and handedness (Duerden et al., 2015).
In summary, this study offers a valuable contribution by demonstrating, based on solid empirical evidence, that adolescents with ASD have an atypical sensory profile characterized by hyposensitivity to non-harmful thermal stimuli. The implications extend beyond neurophysiological understanding, extending to clinical practice and the planning of more effective care strategies. While reading this article, I noted how sensory sensitivity, often seen as a “minor symptom,” can carry profound functional and emotional implications for individuals with ASD.
Reference:
DUERDEN, Emma G. et al. Decreased sensitivity to thermal stimuli in adolescents with autism spectrum disorder: relation to symptomatology and cognitive ability. The Journal of Pain, vol. 16, no. 5, p. 463–471, 2015. DOI: https://doi.org/10.1016/j.jpain.2015.02.001. Available at: https://www.jpain.org. Accessed on: 20 June. 2025.
