| Abstract | [Introduction]
Vagueness or unclarity of thought is considered by Walter (1983) as a worthy and necessary state of (human) mind for modeling. He appeals to quantum mechanics (and, in particular, non-pure states) as, perhaps, the only fruitful model by which to understand such phenomena. The analogy takes the following form: The clarity that indeterminant ideas derive from rumination and discussion parallels the reduction of uncertainty in a parameter of a submicroscopic system that accompanies its quantum measurement. Walter suggests that with an allowance for quantum-like brain states, brains can be classified as physical symbol systems-processors that read, write, store, and compare symbols-of the type described by Newell and Simon (Newell, 1981; Newell & Simon, 1976; Simon, 1981). |
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