issues with direct realism

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  • Created by: ella
  • Created on: 24-02-15 12:53

The argument from illusions:

if you half submerge a straight stick in water, it looks crooked but isnt. You cant tell wether youre seeing an illusion or not, it is 'subjectively indistinguishable from veridical perception'.

  1. We percieve something to have property F.

  2. when we percieve something as having property F, there is something that has this property.

  3. In an illusion, the physical object does not have propert F.

  4. Therefore, what has property F is something mental, a sense-datum.

  5. Therefore, in illusions, we see sense-data and not physical objects immediately.

  6. Illusions can be subjectively indistinguishable from veridical perceptions.

  7. Therefore, we see the same thing (sense-data) in both illusions and veridical perception.

  8. Therefore, in all cases we see sense data and not physical objects immediately.

  9. Therfore, direct realsim is false.

Direct Reaism can give the same reply as before: when the stick in the water looks crooked, there is nothing that is crooked. We directly percieve physical objects and their properties.

The argument from hallucinations:

we can experience perceptual hallucinations – not just visual but auditory and olfactory as well.

  1. In a hallucination, we percieve something as having property F.

  2. When we percieve something as having property F…


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