The Mirror Neuron System and Autism Spectrum Disorder

This post will cover the contested explanations about the relationship between the Mirror Neuron System and Autism Spectrum Disorder. To learn more about mirror neurons and their significance, check out this post. The description of ASD in the post is just a brief overview, so if you want a more thorough explanation, I recommend visiting www.autismspeaks.org or www.autism.org.uk.

Overview of Autism Spectrum Disorder

 Autism Spectrum Disorder, or ASD, is a developmental disability resulting from variations in brain development. People with ASD may behave, interact, learn, and communicate in different ways as compared to most other people, and they may have difficulties with social communication, imitation, and flexible behavior. According to a study titled “Autism and the mirror neuron system: insights from learning and teaching”, individuals with ASD often show difficulty with joint attention, which is a social-communication skill where two people are aware they are sharing an experience, and affect sharing, which is the ability to vicariously experience the emotional states of another person. Furthermore, the study states that those with ASD may perform well on explicit social tasks but struggle with implicit processing, and they may face difficulty when trying to flexibly apply learned behaviors.

The “Broken Mirror” Hypothesis

 The broken mirror hypothesis was a theory proposed in the late 1990s and 2000s. It suggests that social, communication, and imitation challenges in autism spectrum disorder arise from a malfunction in the brain’s mirror neuron system, implying that this dysfunction prevents autistic individuals from simulating and understanding the intentions and emotions of others.

 One line of evidence for this theory is neuroimaging studies which have found reduced activation in brain regions associated with the mirror neuron system when individuals with ASD observe or imitate actions, such as facial expressions. Similarly, EEG research shows that, unlike typically developing individuals, those with ASD don’t exhibit similar brain activity during both execution and observation. Mirror neurons fire when a person both does and sees an action, so it makes sense that some scientists may attribute those findings to a mirror neuron system that functions differently. Because the mirror neuron system is thought to support imitation, empathy, and theory of mind, which are all abilities commonly affected in ASD, these findings have been used to argue that impaired mirroring mechanisms may underlie key aspects of the condition.

The Ongoing Debate

Although the Broken Mirror hypothesis was once a very popular, high-profile theory in neuroscience, it is no longer considered the mainstream scientific explanation, as evidence for it is mixed and inconsistent. In a 2007 study involving giving children with autism goal-directed imitation tasks, results showed that the children with autism exhibited the same systematic errors as those without, and no evidence was found that the mirror neuron system is defective in autism.

Similarly, a 2010 study where the brains were scanned of adults with and without autism while they were watching goal-directed hand actions failed to produce behavioral and imaging data that proved that there was something wrong with basic mirror systems in those with autism.

Alternative Theories

In the last couple of decades, researchers have proposed alternate explanations that move beyond the idea of a fundamentally “broken” mirror neuron system in autism. For example, Raphiel Bernier, a psychologist and professor at the University of Washington, has been exploring a potential link between mirror neuron dysfunction and autism. His research has led him to hypothesize that mirror neuron differences may arise from reduced social experience, rather than an inherent neural deficit.

Similarly, the EP-M (Emulation-Planning/Mimicry) model, is a framework that proposes two pathways for imitation within the mirror neuron system. One pathway is an “EP” route for goal-oriented actions, and an “M” route for reflexive actions. It is often used to study autism, suggesting that deficits lie in the M-pathway rather than the entire mirror neuron system.

The Social Top-Down Response Modulation (STORM) model further shifts the focus by proposing that mirror neuron functioning itself may be intact, but its activation is not properly modulated by social context due to differences in higher-level cognitive control.

Put together, these perspectives suggest that social difficulties in ASD may come from broader differences in attention, motivation, and cognitive control, rather than a simple dysfunction of the mirror neuron system.

Bibliography:

Costandi, Moheb. “‘broken Mirror’ Concept of Autism Challenged.” The Transmitter: Neuroscience News and Perspectives, The Transmitter: Neuroscience News and Perspectives, 1 Oct. 2024, www.thetransmitter.org/spectrum/broken-mirror-concept-of-autism-challenged/.

A Crack in the Mirror Neuron Hypothesis of Autism | Science | AAAS, www.science.org/content/article/crack-mirror-neuron-hypothesis-autism. Accessed 2 Apr. 2026.

“The Mirror Neuron System in Children with Autism.” SFARI, 2 Nov. 2017, www.sfari.org/funded-project/the-mirror-neuron-system-in-children-with-autism/.

Vivanti, Giacomo, and Sally J Rogers. “Autism and the Mirror Neuron System: Insights from Learning and Teaching.” Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences, U.S. National Library of Medicine, 28 Apr. 2014, pmc.ncbi.nlm.nih.gov/articles/PMC4006185/.