Epistemology — AQA Education A-Level Philosophy Revision
This subtopic examines radical scepticism about knowledge, focusing on arguments that challenge the possibility of certainty. Students explore Descartes' m
Topic Synopsis
This subtopic examines radical scepticism about knowledge, focusing on arguments that challenge the possibility of certainty. Students explore Descartes' method of doubt, which systematically questions all beliefs until reaching the indubitable 'cogito', and evaluate various responses such as reliabilism, the closure principle, and contextualism. Understanding these limits deepens critical thinking about justification and has practical relevance for fields like law and science, where evidence is never absolute.
Key Concepts & Core Principles
- Justified True Belief (JTB): The traditional definition of knowledge as belief that is both true and justified. You must understand the conditions and why Gettier cases challenge this definition.
- Empiricism vs. Rationalism: Empiricism (e.g., Locke, Hume) claims all knowledge comes from sensory experience; rationalism (e.g., Descartes, Leibniz) argues reason and innate ideas are primary. Know the key arguments and counterarguments.
- Scepticism: The view that knowledge is impossible or severely limited. Focus on Cartesian scepticism (the evil demon hypothesis) and Humean scepticism about induction and causation.
- Perception as a Source of Knowledge: Direct realism (we perceive the world directly) vs. indirect realism (we perceive sense-data). Understand arguments from illusion and hallucination, and responses like Berkeley's idealism.
- A Priori vs. A Posteriori Knowledge: A priori knowledge is independent of experience (e.g., mathematics, logic); a posteriori knowledge depends on experience. Know the analytic/synthetic distinction and Kant's synthetic a priori.
Exam Tips & Revision Strategies
- Always define technical terms like 'scepticism', 'closure principle', and 'foundationalism' clearly to demonstrate precise understanding.
- Structure essays to first explain the sceptical challenge, then detail Descartes' approach, and finally evaluate responses, ensuring each section directly addresses the question.
- Use the 'therefore' letter (∴) or the term 'entails' when discussing logical relationships, but explain them to show reasoning.
- When evaluating, use counterarguments to responses (e.g., the dream argument can be questioned because dreaming lacks coherence) to show depth.
- Reference the specification's named responses (e.g., reliabilism, contextualism) and connect them to Descartes' method, rather than treating them in isolation.
- Always define key terms (e.g., a priori, innate, intuition, deduction) at the start of your essay to establish a clear conceptual framework and meet assessment objective criteria for knowledge and understanding.
- When evaluating innate knowledge, explicitly consider classical criticisms such as Locke's argument from universal consent or the lack of empirical evidence for innate ideas, and balance them with rationalist rejoinders.
- Structure your evaluation around philosophical criteria like clarity and coherence, comparing rationalist explanations with empiricist alternatives and concluding with a justified judgement on the strength of the intuition and deduction thesis.
Common Misconceptions & Mistakes to Avoid
- Confusing Descartes' method of doubt with a belief that nothing can be known, rather than a methodological tool to find certainty.
- Misrepresenting the evil demon argument as a version of brain-in-a-vat scepticism, overlooking its role within Descartes' rationalist project.
- Failing to distinguish between global and local scepticism, leading to evaluations that mistake limited doubt for universal doubt.
- Describing responses to scepticism without critical evaluation; for example, simply stating Moore's 'Here is a hand' without discussing why it might beg the question.
- Overlooking the role of the malin génie in undermining mathematical truths, mistaking Descartes' doubt as only targeting empirical beliefs.
- Confusing rationalism with idealism: some students mistakenly assume that rationalism entails that the mind creates reality, rather than focusing on the source of knowledge.
Examiner Marking Points
- Award credit for a precise explanation of global scepticism, distinguishing it from local scepticism, and linking it to the closure principle (if S knows P, and S knows P entails Q, then S knows Q).
- Credit detailed analysis of Descartes' three waves of doubt (senses, dreaming, evil demon), showing how each targets a broader class of beliefs.
- Reward evaluation that considers the strengths and limitations of at least two responses to scepticism (e.g., Moore's common sense, contextualism, reliabilism) with reference to how effectively they address the threat of radical doubt.
- High marks for integrating philosophical terminology (e.g., a priori, a posteriori, external world, infallibilism) accurately and consistently throughout the response.
- Expect a balanced conclusion that weighs the persuasiveness of scepticism against responses, demonstrating independent critical engagement.
- Award credit for demonstrating accurate understanding of rationalism as the epistemological stance that some substantive knowledge can be obtained independently of sense experience, through reason alone.
- Assessors should reward clear exposition of empiricism as the opposing thesis that all knowledge originates in sensory experience, with reference to key proponents like Locke and Hume.
- Credit evaluation that critically engages with the intuition and deduction thesis, weighing its explanatory power against challenges from alternative epistemological frameworks such as empiricism or scepticism.