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The Argument from Illusion


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Descartes Dream Scepticism


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Descartes also supports this argument with dream scepticism, which is the second of his sceptical arguments: "However, I must note that I am only human, and consequently that I habitually sleep, and that in my dreams I have images of those same things, or even of more improbable things, that insane people see when they are awake. How many times have I dreamt during the night that I was in this room by the fire, whereas in fact I was asleep, naked in my bed? It seems certain just now that I am not looking at this paper with closed eyes; that as I shake my head I am not asleep; that when I deliberately and intentionally hold out my hand, I am aware of it. The images presented in dreams are not so clear and distinct as these are. Yet, on reflecting more carefully about all of this, I remember that I have often been deceived in my sleep by similar illusions, and thinking even more closely, I conclude that there is nothing that conclusively and clearly distinguishes between waking and sleeping. I am quite amazed at this, and I feel so astonished that I am almost convinced that I am actually asleep right now!"
Contents of
The Argument from Illusion

1 The Problem of Other Consciousnesses
2 Subjective and Objective
3 Berkeley: The Principles of Human Knowledege
4 Esse est Percipi
5 The Argument from Illusion in Descartes and Hume
6 Descartes - Sceptical Arguments - Sense Deception
7 Descartes Dream Scepticism
8 J. L. Austen: Sense and Sensibilia
9 The Argument from Illusion in Berkeley and Hume
10 Entrapment within Subjectivity

Related articles: (1) Descartes: Meditation I, (2) The Argument from Illusion