Key idea: Most of our decisions are made by fast, automatic thinking — efficient, but open to predictable errors.
In the learning and cognition context, a central idea is dual processing: the mind uses fast, automatic System 1 and slow, effortful System 2. This links to the concept of bias: System 1's shortcuts are usually helpful but produce systematic errors, such as anchoring and confirmation bias.
Remember: Fast gut, slow check. Decision-making mixes quick intuition with slow reasoning.
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Key idea: If System 1 simply answered and System 2 slept, people would feel sure of their wrong answers. They do not.
De Neys, Rossi and Houdé (2013) found that people who gave the wrong answer to the bat-and-ball problem felt less confident than on an easy problem with no conflict.
What HL adds: Paper 3 sources may give confidence ratings as data. Compare the conditions, then say what confidence can and cannot show about hidden processes.
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Key idea: Dual processing is influential and applicable but the 'two systems' may be a simplification.
Strengths and limitations
| Strengths and limitations | Strengths | Limitations |
|---|---|---|
| Explains | A huge range of biases and quick judgements | The 'two systems' may be a metaphor, not real parts |
| Evidence | Supported by reasoning and reaction-time studies | Some tasks are artificial; hard to isolate a 'system' |
| Application | Improves decisions; warns against snap judgements | Bias varies by person and context |
So dual processing is a powerful, well-supported framework for understanding decision-making and bias, with real practical value (e.g. slowing down for important decisions). A good evaluation notes the two 'systems' are better seen as modes than literal parts, and that bias strength varies.
Watch out: System 1 isn't 'bad'. It's fast and usually right. The skill — and the exam point — is knowing when to slow down and let System 2 check.