realism and idealism direct/naive realism @ from perceptual variation @ from illusion @ from...
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Realism and Idealism
Direct/naive realism@ from perceptual variation@ from illusion@ from hallucination & dreaming@ from time lagVeridical perceptionIndirect realismSense data (and their qualities)Physical objects (and their qualities)SolipsismPrimary qualitiesSecondary qualitiesIdealismBerkeleyMaster argument
Justified True Belief
Propositional knowledgeProcedural knowledgeJustificationInfinite regressTruthParadigmsBeliefIncompatibilismNecessitySufficiencyGettier examplesNo false lemmasInfallibilismReliabilismTracking the truth
MiscellaneousIncorrigible Premise & Conclusion Syllogism Specious argumentvalidity & soundnessIndefeasible deduction inductioncounterfactuals indexical statementsInfallible subjectively indistinguishable dogmatic pragmatic
unassailableSentient beings cognizant beings sceptical naturalistic fallacy epistemologyAppearance & reality Bertrand Russell John Locke
Empiricism & Rationalism
EmpiricismInnate knowledgeSimple & Complex ideasHume’s ForkThe problem of inductionAnalytic v synthetic statementsa priori v a posteriori knowledgeRationalismMathematical synthetic a prioriDescartes’ radical doubtOntological argumentsUniversal causationPhilosophical statementsUniversals v particularsMoral relativism v objectivism
Direct or Naive RealismDefinitionReality is as it appears
IllustrationTake a photo of the world – and that is ‘objectively’ how it is, even without someone viewing it.
Contrasts/alternativesIndirect realism & idealism
Subdivisions/special casesA common sense or prephilosophical viewpoint
Argument from perceptual variationPremisePeople perceive the same scene differently
PremiseOne person will often see the same scene differently over time
ConclusionThe objective world cannot be identical to what is perceived.
Any weaknesses/limitations/corollariesA corollary (ie additional conclusion/result) is we perceive something other than Reality – and that this is sense-data.
Argument from illusionPremise
Premise
Conclusion
Any weaknesses/limitations/corollaries.
Argument from hallucination/dreamingPremise
Premise
Conclusion
Any weaknesses/limitations/corollaries.
Argument from time lagPremise
Premise
Conclusion
Any weaknesses/limitations/corollaries.
Veridical perceptionDefinitionPerception under normal circumstances – unmediated by distorting influences (such as drugs, strange atmospheric phenomena, sleep)
IllustrationPerceiving a teapot under normal lighting conditions, when awake, and of sound mind
Contrasts/alternativesDreaming
Subdivisions/special cases
Indirect RealismDefinitionWhat we perceive is caused by and represents physical reality
IllustrationWhen we see a dog on a chair, there are things objectively causing those two perceptions, which is related in a similar way to how they appear.
Contrasts/alternatives(direct realism) Idealism
Subdivisions/special casesSense-data are the medium through which we perceive the world.John Locke is the most famous advocate of this position
Sense-dataDefinitionInformation reaching our minds via out 5 senses.Infallible, transitory (or fleeting) and essentially private.
Illustration
Contrasts/alternatives
Subdivisions/special casesVisual, auditory, tactile, gustatory, olfactory
Physical objectsDefinition
Illustration
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SolipsismDefinition
Illustration
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Primary qualitiesDefinition
Illustration
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Secondary qualitiesDefinition
Illustration
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IdealismDefinition
Illustration
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Berkeley’s Master ArgumentPremise
Premise
Conclusion
Any weaknesses/limitations/corollaries.
Propositional KnowledgeDefinition
Illustration
Contrasts/alternativesProcedural knowledge – knowledge how to do something. Such as ‘knowing how to ride a bicycle’.
Subdivisions/special cases
Knowledge – Justification necessaryDefinitionPlato claims that justified true belief was both necessary and sufficient for knowledge. Justification requires being able to explain our beliefs with adequate reasons.
IllustrationThe racist juror example - ….
Contrasts/alternativesKnowledge without justification. Problems of infinite regress – how do we achieve full justification if each reason requires further justification. To prevent infinite regress, some reasons must be axiomatic.
Subdivisions/special cases
Knowledge – Truth necessaryDefinitionPlato claims that justified true belief was both necessary and sufficient for knowledge. Truth requires that the proposition in question be verified – ie checked that it is true.
Illustration.
Contrasts/alternativesKnowledge without truth. Kuhn claims that scientific cannot be objectively classified as true/false, since it continually works within a paradigm – which decides which questions it will deem worth answering.
Subdivisions/special cases
Knowledge – Belief necessaryDefinitionPlato claims that justified true belief was both necessary and sufficient for knowledge. Belief requires that the proposition be held to be true, in someone’s mind.
Illustration.
Contrasts/alternativesKnowledge without belief. Incompatibilism claims that propositions are either known or believed. This depends on a special connotation of ‘belief’ which implies that they must be open to doubt.
Subdivisions/special cases
A necessary conditionDefinition
Illustration.
Contrasts/alternatives
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A sufficient conditionDefinition
Illustration.
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JTB not sufficient for knowledgeDefinitionGettier claims that a belief being justified and true is not always sufficient to constitute knowledge. His examples depend upon the fact that some beliefs can be reasonable, but actually true by accident.
Illustration.
Implications
Illustration.
No false lemmasDefinitionThis offers a supplement to Plato’s tripartite definition of knowledge which copes with Gettier examples. It claims that JTbeliefs are only knowledge if they are not based upon any false claims (lemmas) along the way.
Illustration.
Contrasts/alternatives
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InfallibilismDefinitionThis offers a supplement to Plato’s tripartite definition of knowledge which copes with Gettier examples. It claims that JTbeliefs are only knowledge if…
Illustration.
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ReliabilismDefinitionThis offers a supplement to Plato’s tripartite definition of knowledge which copes with Gettier examples. It claims that JTbeliefs are only knowledge if they track the truth.
Illustration.
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EmpiricismDefinition
IllustrationHume was an empiricist. He believed that we could not have knowledge of what is morally right, what causes events to happen, who we are and the nature of God – because none of these are accessible through our senses.Contrasts/alternatives
Subdivisions/special cases
Innate knowledgeDefinition
Illustration.
Contrasts/alternativesLocke’s idea of a tabula rasa – in which he claims that our minds are a blank slate when we are born
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Simple ideasDefinitionThese are the most basic parts of Hume’s explanation of empirical knowledge. They cannot be broken down. They are mostly gained by ostensive definition (pointing)
Illustration
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Contrasts/alternatives
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Complex ideasDefinition
Illustration
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Contrasts/alternatives
Subdivisions/special casesA golden mountain – Hume was able to explain how we could use terms which no-one had ever experienced.
Hume’s ForkDefinitionHume claimed that all knowledge was either ‘matters of fact’ or ‘relations of ideas’
Illustration
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Contrasts/alternatives
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The problem of inductionDefinition
IllustrationWe never see one event being necessarily caused by another. We just see the spatial contiguity, temporal succession and repetition.
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Analytic propostionsDefinition
Illustration
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Contrasts/alternativesSynthetic propositions
Subdivisions/special cases
a priori knowledgeDefinition
Illustration
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Contrasts/alternatives‘a posteriori’ knowledge
Subdivisions/special casesRationalists believe that some a priori knowledge of synthetic propositions.
a posteriori knowledgeDefinition
Illustration
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Contrasts/alternatives‘a priori’ knowledge
Subdivisions/special cases‘A posteriori’ knowledge is contingent (rather than necessary) because it is not true in all possible worlds.
rationalismDefinition
Illustration
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Contrasts/alternativesEmpricismGnosticism
Subdivisions/special cases
Synthetic a priori : mathsDefinitionSome mathematical statements appear to be synthetic, and yet must be known a priori since they are necessarily true
Illustration‘The angles in a triangle add up to 180°’. Not true by definition of ‘triangle’. But not in need of a posteriori verification – since it can be demonstrated with a logical proof°°
Contrasts/alternativesIt is claimed that mathematical truths like this are actually based upon Euclid’s axioms, which must be checked a posteriori like all other empirical knowledge. Eg triangles on a sphere (non-Euclidean geometry)
Subdivisions/special cases
Synthetic a priori : DescartesDefinition
Illustration°°
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Synthetic a priori : Ontological argumentDefinition
Illustration°°
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Synthetic a priori : universal causationDefinition
Illustration°°
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Synthetic a priori : philosophical statements
DefinitionStatements about how knowledge relates to reality, or about where knowledge comes from, appear to be not capable of a posteriori verification, and yet are not true by definition
Illustration‘Esse es percipi’‘All synthetic propositions are known a posteriori’
Contrasts/alternativesWittgenstein –a logical positivist – claimed that such philosophical claims are not knowledge. “That of which we cannot speak, we must stay silent”
Subdivisions/special cases
Synthetic a priori : universals
Definition
Illustration
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Synthetic a priori : moral truths
Definition
Illustration
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