On your whiteboards: 1. 3 differences between philosophical

On your whiteboards: 1. 3 differences between philosophical

On your whiteboards: 1. 3 differences between philosophical scepticism and everyday incredulity 2. What is meant by infinite regress? Why is it a problem for the epistemological sceptic? 3. What is foundationalism? Todays Objective:

To understand Descartes Three Waves of Doubt and the responses to them. Reading Task Descartes first meditation How was it? What was difficult? If I gave you

another reading to do now, would you approach it any differently? Go through your annotations and compare with your friend. Do you agree about what Descartes is saying?

Descartes scepticism Descartes scepticism Descartes scepticism Descartes scepticism

Descartes scepticism Descartes scepticism Can Descartes really doubt ALL

of his beliefs? Evaluating Descartes method of doubt If he doubts all his beliefs, he must doubt his belief that he had some beliefs. But if he doubts that he had beliefs, then he cant doubt those beliefs.

So, there seem to be limits to how sceptical he can be, and Descartes must retain the basic framework of beliefs concerning the nature of doubt, certainty an evidence which allow his method to operate. Wave 1 The argument from illusion We have covered this thoroughly in

our study of Direct Realism. Is Descartes right to doubt his senses? Wave 2 The argument from dreaming Matrix clip 1

Problems: Dreams can be distinguished from waking life Dreams must come from waking life Wave 3 The evil demon Matrix 2

Matrix 3 Do you know you are not in the Matrix right now? If we are in the Matrix, is there anything we can be certain of? The Matrix is a modern version of the old brain-in-a-vat thought

experiment Im walking along Skegness beach in the sunshine

You should now be able to explain: Descartes method of doubt How each wave of doubt works And to argue: How effective is each wave for Descartes argument?

Responses to scepticism 1 Descartes own response The cogito Clear and distinct ideas Clear and distinct doesnt mean its true How do we know which ideas are clear and distinct? Needs to prove God to dispel all doubt

Cartesian circle Responses to scepticism 2 - Empiricism Think back to Russell, Locke and Berkeley. How would they persuade Descartes to trust his senses?

Responses to scepticism 3 - Reliabilism Scepticism tries to show we have no justification for knowledge, so one of the necessary conditions is missing, so we dont have knowledge. But reliabilism denies that we need justification for knowledge. We just need our knowledge to be arrived at via a reliable process.

I can know that I am not a brain in a vat as long as the beliefs I have about the reality of objects around me are produced by a reliable process. I dont have to know what this reliable process is, or whether I am in a vat or not. I can still have knowledge. You should now be able to explain:

Three responses to Descartes scepticism And to argue: How sceptical should we be?

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