Introduction to Mirror Neurons

The human brain is a labyrinthine network of neurons, continuously communicating and orchestrating the myriad functions that define our existence. Among these, a remarkable set of neurons known as mirror neurons have captivated scientists and psychologists alike. Discovered in 1992 by a team of Italian researchers led by Giacomo Rizzolatti at the University of Parma, mirror neurons have opened a window into understanding a host of human behaviors, including empathy, imitation, and social cognition.

The concept of mirror neurons is associated with many concepts in social psychology. These include theory of mind, empathy, compassion, sympathy, attunement, and mindsight. Daniel Siegel, a clinical professor of psychiatry at the UCLA School of Medicine, explains that the ability to perceive “another’s intentions, attentional focus, and evaluation of events allows us to understand social interactions and anticipate the behavior of other people” (Siegel, 2020).

What are Mirror Neurons?

Mirror neurons are a special class of brain cells that respond both when an individual performs an action and when they observe the same action performed by another. It is important to note that mirror neurons are more of a state of neuronal circuitry rather than single identifiable neurons. The circuitry is formed through learning, allowing individuals to observe and attune to other’s emotions, and predict both their internal experience and future behavior.

Initially identified in macaque monkeys, these neurons were found to fire both when the monkey grasped an object (a Banana) and when it saw a human or another monkey performing the same action.

V.S. Ramachandran, the director of the Center for Brain and Cognition and a professor with the psychology department and neurosciences program at the University of California, San Diego, explains:

“This is an indispensable trait for intensely social creatures like primates. It isn’t clear how exactly the mirror neuron is wired up to allow this predictive power. It is as if higher brain regions are reading the output from it and saying (in effect), ‘The same neuron is now firing in my brain as would be firing if I were reaching out for a banana; so the other monkey must be intending to reach for that banana now.’ It is as if mirror neurons are nature’s own virtual-reality simulations of the intentions of other beings” (Ramachandran, 2011)

This groundbreaking discovery suggested that the brain possesses a mechanism for mirroring the actions of others, bridging the gap between action execution and observation.

Five Necessary Criteria of the Mirror Neuron

Daniel Siegel presents five necessary criteria for a cell to be a mirror neuron in his book the Developing Mind.

• The cell must have both motor and perceptual activation.
• The mirror neuron acts with intention or purpose with predictable sequences.
• The perception of another’s predictable motions is used to create an image of that person’s mind.
• This image of the other’s intentional state is then used to initiate behavioral imitation and internal simulation.
• The mirror properties in our brains enable us to imagine empathically what is going on inside another person (Siegel, 2020).

Prediction and the Mirror Neuron

A primary role of the mirror neuron circuitry is for social interactions. The experience of other people’s emotions is essential for bonding but also essential for predicting danger. Predicting that a person is angry and may physically attack has tremendous survival benefits.

Lisa Feldman Barrett, a University Distinguished Professor of Psychology at Northeastern University, explains that this efficient, predictive process is “your brain’s default way of navigating the world and making sense of it.” It generates predictions to perceive and explain everything you see, hear, taste, smell, and touch. The mirroring arousal within the body is a matter of predicting the behaviors of others outside of our own experience. Your brain must explain “bodily sensations to make them meaningful, and its major tool for doing so is prediction.” (Barrett, 2018, pp. 60-66).

Antonio Castile and his colleagues wrote that all the pieces of experimental evidence reviewed so far “are compatible with the view that mirror neurons integrate in their responses characteristics of observed actions that are directly related to describing them in terms of motor goals, such as the type of grip or the intention of the actor” (Casile et al., 2011).

See Psychology of Prediction for more on this topic

Localization in the Brain

In humans, mirror neurons are predominantly located in the premotor cortex (F5 neurons) and the inferior parietal lobule, regions of the brain associated with planning and executing movements (Casile et al., 2011).

G. Di Pellegrino and his colleagues further explain:

“One of the distinguishing characteristics of F5 neurons is that they become active during particular goal-directed hand movements, such as grasping, holding, and tearing. Many of them are specific for different types of hand grip. Some discharge during grip with the index finger and the thumb, some during finger prehension, and others during prehension with the whole hand. Furthermore, a proportion of F5 neurons are activated by visual stimuli which require a particular type of grasping” (Pellegrino et al., 1992).

Additionally, evidence suggests that the insula and the anterior cingulate cortex, areas linked to emotional processing, also harbor mirror neurons. This widespread distribution indicates that mirror neurons may play a crucial role not only in motor activities but also in emotional and social interactions.

The Role of Mirror Neurons in Empathy

Empathy, the ability to understand and share the feelings of others, is a cornerstone of human social life. Mirror neurons are thought to be instrumental in empathy by enabling individuals to simulate the emotional states of others internally. When we see someone expressing joy, sadness, or pain, our mirror neurons activate, creating a neural representation of that emotion in our own brain. This mirroring process allows us to experience a vicarious version of the other’s emotional state, fostering deep interpersonal connections.

Social Skills

Mirror neurons play a pivotal role in developing and refining our social skills.

Daniel Goleman wrote:

“Social skills depend on mirror neurons. We understand others’ actions by creating a template for it in (our) own brain. Mirror neurons allow us to grasp the minds of each other not through conceptual reasoning but through direct simulation; by feeling, not by thinking” (Goleman, 2007).

By allowing us to understand and imitate the actions and emotions of others, these specialized neurons facilitate a range of social competencies.

• Empathy: Mirror neurons enable us to vicariously experience the emotions of others, fostering empathy and understanding. This heightened emotional awareness helps us respond appropriately to the feelings of those around us.
• Social Learning: By observing and imitating the actions of others, we can learn new skills and behaviors. This ability to learn through observation is crucial for social development, as it allows us to acquire cultural norms, customs, and social etiquette.
• Theory of Mind: Mirror neurons contribute to our ability to understand the thoughts, intentions, and perspectives of others. This cognitive skill, known as theory of mind, is essential for effective social interaction and communication.
• Non-verbal Communication: Mirror neurons help us interpret non-verbal cues, such as facial expressions, body language, and gestures. This ability to decode social signals is vital for successful social interactions.

In essence, mirror neurons provide the neural foundation for social intelligence, enabling us to connect with others, build relationships, and navigate complex social situations.

Emotional Attunement

Mirror neurons play a crucial role in emotional attunement by allowing us to vicariously experience the emotions of others. When we observe someone expressing an emotion, such as sadness or joy, our mirror neurons fire, simulating that same emotional state within our own brains. This neural mirroring enables us to understand and share the feelings of others, fostering empathy and connection.  

For example, when we see someone smiling, our mirror neurons activate the same neural pathways associated with happiness, causing us to feel a sense of joy ourselves. Similarly, when we witness someone experiencing pain, our mirror neurons may trigger a physical sensation of discomfort, allowing us to empathize with their suffering. This capacity for emotional attunement is fundamental to social interaction, as it helps us to build strong relationships and cooperate with others.

See Emotional Attunement for more on this concept

Sincere Apologies

Intimate relationships open partners to pain. Through trust, we make decisions based on realistic expectations of a partner. Violations of these expectations shatters trust, leading to hurt. When our actions hurt a partner, it is important to recognize the pain we have caused.

Diana Fosha wrote:

“It is essential to direct people to slow down and look directly at their partner when this partner is expressing a powerful emotion. In the process of creating forgiveness, for example, the injured party has to look in the other’s face and see that his or her pain is ‘felt,’ that it impacts the offending partner. Without this level of connection, which potentially activates mirror neurons, apologies tend to be simply empty words” (Fosha, 2009).

It is essential to understand the enormity of our action to sincerely apologize. Many apologies are not out of regret over the hurt but a functional way to receive forgiveness.

Mirror Neurons and Imitation

Imitation is another fundamental aspect of human behavior that mirror neurons help to elucidate. From early childhood, humans display an extraordinary capacity to imitate the actions of others, a skill crucial for learning and socialization. Mirror neurons provide a neural substrate for this ability by mapping observed actions onto the observer’s own motor repertoire. This mapping allows individuals to replicate actions they see, facilitating the transmission of cultural knowledge and social norms.

Ramachandran wrote:

“Culture consists of massive collections of complex skills and knowledge which are transferred from person to person through two core mediums, language and imitation. We would be nothing without our savant-like ability to imitate others. Accurate imitation, in turn, may depend on the uniquely human ability to ‘adopt another’s point of view’—both visually and metaphorically—and may have required a more sophisticated deployment of these neurons compared with how they are organized in the brains of monkeys” (Ramachandran, 2011).

Developmental Perspectives

The development of mirror neuron systems begins early in life. Infants as young as a few months old demonstrate imitative behaviors, such as mimicking facial expressions and hand movements. Research suggests that these early imitative actions are underpinned by the activity of mirror neurons, which continue to mature and refine as the child grows. This developmental trajectory underscores the importance of mirror neurons in shaping our ability to learn from and connect with others.

Implications for Social Cognition

Beyond empathy and imitation, mirror neurons are implicated in a broader array of social cognitive processes. These include understanding intentions, predicting actions, and attributing mental states to others. By simulating the observed actions and emotions of others, mirror neurons provide a neural mechanism for “mind-reading,” allowing individuals to infer the goals and motivations behind others’ behaviors.

Autism Spectrum Disorder

The mirror neuron system has also been studied in relation to autism spectrum disorder (ASD), a condition characterized by impairments in communication, language, and the capacity to understand other. These functions match the functions mediated by the mirror neurons. Some researchers propose that dysfunctions in the mirror neuron system may contribute to the social deficits observed in ASD (Rizzolatti & Fabbri-Destro, 2010).

Neuroimaging studies have found atypical activation of mirror neurons in individuals with ASD, which may underlie difficulties in empathy, imitation, and understanding social cues. While this hypothesis remains a topic of ongoing research, it highlights the potential relevance of mirror neurons in neurodevelopmental disorders.

Critiques and Controversies

Despite the enthusiasm surrounding mirror neuron theory, it is not without its critics. Some scholars argue that the evidence linking mirror neurons to complex human behaviors is not yet conclusive and that alternative explanations should be considered (Schad, 2019). For instance, critics point out that mirroring activity observed in the brain might be a byproduct of associative learning rather than a dedicated mechanism for empathy or imitation.

Cecilia Heyes and Caroline Catmur wrote:

“Some of the recent studies have reported greater activity in mirror-neuron brain areas in pianists and dancers than in people who lack such expertise during observation of musical performance and dance, respectively. These studies are of interest because they indicate that activity in mirror- neuron brain areas is affected by long-term learning under naturalistic conditions, but they do not indicate what kind of learning is important” (Heyes & Catmur, 2021).  

Moreover, the extent to which mirror neurons are involved in higher-order cognitive functions, such as understanding intentions or mentalizing, is still debated. While mirror neurons undoubtedly play a role in action observation and execution, the precise nature and scope of their contributions to social cognition remain active areas of investigation.

Empirical Evidence

Numerous studies have provided empirical support for the role of mirror neurons in empathy. Functional magnetic resonance imaging (fMRI) studies have shown that observing someone else’s emotional expressions activates brain regions rich in mirror neurons, including the insula and the anterior cingulate cortex (Cattaneo & Rizzolatti, 2009). This neural mirroring correlates with self-reported measures of empathy, suggesting that individuals with higher empathic tendencies exhibit stronger mirror neuron responses.