Activity 01
Type vs. Token Sorting Challenge
Provide students with cards featuring various examples (e.g., 'the novel Moby Dick', 'my copy of Moby Dick'; 'the species cat', 'my pet cat Tibbles'). In pairs, students must sort these into 'type' and 'token' categories, helping to make this abstract philosophical distinction concrete before applying it to mental states.
Explain the difference between type-identity and token-identity theory.
Facilitation TipCirculate and check for understanding, ensuring pairs can articulate the reasoning behind their sorting choices.
What to look forUse mini-whiteboards for students to write a one-sentence summary of the multiple realisability argument. This allows for a quick check of comprehension across the whole class.
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Activity 02
Multiple Realisability Brainstorm
In small groups, students brainstorm as many potential beings as possible that could plausibly experience pain but have a different physiology to humans (e.g., octopuses, silicon-based aliens, future AI). Each group then explains how their examples challenge the idea that pain must be C-fibre activation.
Analyse the argument from multiple realisability as a criticism of type-identity theory.
Facilitation TipEncourage creativity but prompt students to justify why their imagined being's pain would still count as pain.
What to look forSet an essay question: '“Identity theory successfully reduces the mind to the brain.” Discuss.' This assesses students' ability to analyse, evaluate and construct a sustained philosophical argument.
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Activity 03
Ockham's Razor Debate
Present two explanations for feeling happy: a dualist one involving a non-physical soul, and an identity theorist one involving dopamine release in the brain. The class debates which theory is 'simpler' and therefore preferable according to Ockham's Razor, considering what each theory has to assume.
Evaluate whether Ockham's razor supports mind-brain identity theory over dualism.
Facilitation TipAct as a moderator, ensuring students define what they mean by 'simpler' and 'assumption' in this context.
What to look forProvide students with a 'confidence tracker' where they rate their ability (from 1 to 5) to explain key concepts like type/token identity, Ockham's Razor, and multiple realisability, and to identify areas for revision.
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Generate Complete Lesson→A few notes on teaching this unit
Start by using a simple analogy like 'water is H₂O' to introduce the concept of a scientific identity claim. When explaining type versus token, use a concrete example like a specific model of car (type) versus an individual car (token). Use this grounding to scaffold the more abstract application to mental states, ensuring students grasp the distinction before moving on to critiques.
Upon completion, students will be able to articulate the core claims of Mind-Brain Identity Theory and critically evaluate its main arguments and the powerful objections it faces.
Watch Out for These Misconceptions
Identity theory is the same as behaviourism.
This is incorrect. Behaviourism defines mental states by external, observable behaviours, whereas identity theory defines them as internal, physical brain states. For an identity theorist, the feeling of pain is a brain process, not the wincing or crying out that might result from it.
Identity theory just means 'the mind is the brain'.
This is too vague. The theory makes a more precise claim that mental *states* and *processes* (like a specific belief or a feeling of joy) are numerically identical to brain *states* and *processes*. It is a claim about the identity of processes, not about two objects being the same.
If scientists cannot yet show me the exact brain state for 'believing it will rain', the theory must be false.
Identity theory is proposed as an empirical, scientific hypothesis, not a conceptual truth. Proponents argue that the identities will be discovered as neuroscience progresses. A current lack of complete neurological mapping is not a philosophical refutation of the theory's possibility.
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