Smart argues that since an after-image is not in physical space, and a brain process is, the after-image must not be a brain process.

Question

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Smart's argument is not that the after-image must not be a brain process because it's not in physical space; rather, he uses the example of after-images to challenge the identity theory by discussing the difficulty of correlating subjective experiences with physical brain processes. However, he ultimately supports a form of identity theory, suggesting that sensations and brain processes are identical, even if our language or conceptual framework struggles to neatly align them.

Smart Argues That Since an After-Image Is Not in Physical