Social Cognition (AQA A-Level Psychology): Revision Notes
The Mirror Neuron System
What are mirror neurons?
The mirror neuron system comprises specialised brain cells called mirror neurons that are distributed across multiple brain regions. What makes these neurons remarkable is their dual-response property - they become active both when we perform an action ourselves and when we observe someone else performing the same action. This unique characteristic suggests these neurons may play a vital role in social cognition, helping us interpret the intentions and emotions of others around us.
Mirror neurons are thought to be involved in several key social-cognitive processes including empathy, understanding others' intentions, perspective-taking, and theory of mind development. These abilities form the foundation of successful social interaction and communication.
The discovery of mirror neurons has fundamentally changed our understanding of how humans process social information, moving from purely cognitive explanations to biological mechanisms that operate automatically in our brains.
The discovery of mirror neurons
The discovery of mirror neurons happened somewhat by chance, as is often the case with important scientific breakthroughs. Rizzolatti et al. (2006) were investigating electrical activity in the motor cortex of monkeys - the brain region responsible for controlling movement. During their research, one of the scientists reached for his lunch while a monkey was being monitored. Remarkably, the monkey's motor cortex showed activation patterns identical to those seen when the animal itself reached for food.
The Accidental Discovery: The Lunch Experiment
Step 1: Researchers were monitoring electrical activity in a monkey's motor cortex Step 2: A scientist reached for his lunch while the monkey was being observed Step 3: The monkey's brain showed the same activation pattern as when the monkey itself reached for food Step 4: Further testing confirmed these were the same individual brain cells firing in both conditions
Further investigation revealed that the same individual brain cells fired regardless of whether the monkey performed the reaching action or simply observed someone else reaching. The researchers termed these cells 'mirror neurons' because they appeared to mirror the motor activity observed in other individuals.
Mirror neurons and intention understanding
Understanding mirror neurons has revolutionised how we think about social cognition and our ability to understand others' intentions. Gallese and Goldman (1998) proposed that mirror neurons don't simply respond to the physical actions we observe, but actually respond to the underlying intentions behind those behaviours.
Rather than the traditional view that we interpret others' actions through conscious reasoning and memory recall, mirror neurons suggest we actually simulate others' actions within our own motor system automatically and unconsciously.
This simulation process, mediated by mirror neurons, allows us to experience and understand the intentions driving the observed behaviour without conscious effort or deliberate analysis.
Mirror neurons and perspective-taking
Research suggests mirror neurons contribute to other important social-cognitive abilities, particularly theory of mind and perspective-taking skills. When mirror neurons respond to others' actions and intentions, this may provide a neural mechanism that allows us to experience and understand different perspectives and emotional states.
Just as we can simulate others' intentions by drawing on our own motor responses, this same neural information may enable us to interpret what others are thinking and feeling. This represents a biological basis for empathy and emotional understanding.
This neurological foundation for empathy explains why we might automatically feel sad when seeing someone cry, or feel tension when watching someone in a dangerous situation - our mirror neurons are literally making us experience a version of what we observe.
Mirror neurons and human evolution
Ramachandran (2011) has argued that mirror neurons have been so important that they have actually influenced human evolutionary development. The complex social interactions that characterise human society require sophisticated brain systems capable of understanding intention, emotion, and perspective.
Without these cognitive abilities, humans could not function effectively in large groups with the intricate social roles and cultural rules that define human civilisation.
Ramachandran suggests that mirror neurons have been essential to understanding how humans developed as a social species, potentially being one of the key factors that allowed us to build complex societies and cultures.
Mirror neurons and autism spectrum disorder
Important evidence regarding mirror neurons and perspective-taking comes from research into autism spectrum disorders (ASD). ASD is characterised by difficulties with the same social-cognitive abilities that mirror neurons are thought to support. Children on the autism spectrum often struggle with understanding social behaviour and may show reduced mirror neuron system functioning.
Ramachandran and Oberman (2006) developed the 'broken mirror' theory of ASD. This theory proposes that neurological problems, including dysfunction in the mirror neuron system, prevent children from imitating and understanding social behaviour in others. These difficulties typically appear in early childhood when children diagnosed with ASD show less imitation of adult behaviour compared to their peers.
The 'Broken Mirror' Theory of Autism
The theory suggests a progression:
- Normal development: Mirror neurons allow children to automatically imitate and understand social behaviour
- In ASD: Mirror neuron dysfunction prevents normal social learning
- Result: Children fail to develop typical abilities for reading intention and emotion in others
- Outcome: Social communication difficulties characteristic of autism emerge
Evidence supporting mirror neurons in social cognition
Several studies provide evidence for mirror neuron involvement in human social cognition. Haker et al. (2012) demonstrated that brain areas rich in mirror neurons activate during contagious yawning - a basic form of human empathy involving our ability to perceive others' mental states.
Study 1: Contagious Yawning and Mirror Neurons
Using functional magnetic resonance imaging (fMRI), researchers measured brain activity in participants while they were shown films of other people yawning.
Results: When participants yawned in response, there was notable activity in Brodmann's area 9, a region in the right frontal lobe believed to contain many mirror neurons.
Additionally, Mouras et al. (2008) found evidence suggesting the pars opercularis (another brain region rich in mirror neurons) is involved in perspective-taking. Male participants viewed different types of video content while brain activity was measured using fMRI and physical arousal was monitored.
Study 2: Perspective-Taking and Sexual Arousal
Method: Brain activity was measured while participants viewed arousing visual content Key Finding: Activity in the pars opercularis occurred just before sexual arousal Interpretation: This timing is consistent with the idea that mirror neurons enabled the perspective-taking that made the visual content arousing
Both studies support mirror neuron importance in social cognition by showing that brain regions containing these neurons activate during empathy and perspective-taking tasks.
Limitations in studying mirror neuron activity
Major Methodological Limitation
A critical weakness in human mirror neuron research involves the methods used to study these cells. For ethical reasons, researchers cannot insert electrodes into human brains to measure activity at the individual neuron level.
The evidence described above comes from brain scanning techniques that identify activity levels in brain regions rather than individual neurons. This creates a weakness in mirror neuron research because scientists are measuring activity in brain areas and then inferring this means mirror neuron activity. However, there is limited direct evidence for actual mirror neuron firing from such studies.
Mixed evidence for mirror neuron dysfunction in autism
Hadjikhani (2007) reviewed evidence linking ASD to mirror neuron deficits and found some supporting research. Structural brain scans have shown reduced average thickness in the pars opercularis among participants on the autism spectrum. Similarly, functional brain scans have demonstrated lower activity in brain areas associated with mirror neurons in people with ASD.
Inconsistent Research Findings
While some studies support the broken mirror theory, the findings have not been consistently replicated across different research groups and populations. This inconsistency presents a significant challenge for establishing a definitive link between mirror neuron dysfunction and autism.
However, these findings have not been consistently replicated, and the evidence connecting ASD to mirror neuron problems remains mixed. This presents a challenge for the broken mirror theory of ASD. While the theory appears plausible given the close relationship between ASD symptoms and likely mirror neuron functions, there is insufficient reliable direct evidence to fully support the theory.
Criticisms of mirror neuron research
Gregory Hickok (2009) has raised questions about fundamental assumptions in mirror neuron research. Hickok challenges the basic assumption that mirror neurons exist as a distinct class of brain cell, arguing that we only know mirror neurons by their function rather than being able to identify individual cells and demonstrate their differences from other neurons.
Fundamental Challenge to Mirror Neuron Research
Hickok's criticism is particularly problematic because it suggests the functions attributed to mirror neurons may still occur through brain cell activity, but not necessarily through specialised neurons. This challenges the entire foundation of mirror neuron theory.
This criticism is controversial, with other researchers (such as Mukamel et al., 2010) maintaining that isolated mirror neurons do exist. Hickok also questions whether mirror neurons play the precise role in social cognition that has been suggested. He argues that mirror neuron activity might be more concerned with using others' behaviour to plan our own actions rather than understanding the cognitions behind their behaviour.
These criticisms suggest either that mirror neuron research may not be necessary, or alternatively, that researchers need to provide stronger evidence to support their claims about mirror neuron roles in social cognition.
Key Points to Remember:
- Mirror neurons are special brain cells that fire both when we perform actions and when we observe others performing the same actions
- Mirror neurons may enable intention understanding by allowing us to simulate others' actions in our own motor system rather than just observing behaviour
- Perspective-taking abilities may be supported by mirror neurons providing a neural mechanism for experiencing and understanding others' emotional states and viewpoints
- The broken mirror theory suggests that autism spectrum disorders may result from dysfunction in the mirror neuron system, leading to difficulties with social cognition
- Research limitations include the inability to directly study individual mirror neurons in humans and mixed evidence for the proposed links between mirror neurons and social cognitive abilities