MacDonald tells us, "there are procedures for determining whether any waking perception is veridical or illusory. One perception is checked or corrected by others." These procedures are constantly and deliberately employed when a perception is doubted. If I want to determine whether a rock is near me, then I can try to touch it in order to prove that the object is, or is not, real. From this discussion, MacDonald concludes that this is logically impossible in a dream.

Question

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MacDonald's argument implies that it is not possible to employ the same procedures for verifying perceptions in a dream as we do when we are awake. Therefore, it is logically impossible to determine whether a perception in a dream is veridical or illusory through touch or other means of verification.

MacDonald Tells Us, "There Are Procedures for Determining Whether Any