The Mental Logic Theory and De Morgan’s Laws
Miguel López-Astorga

Abstract
Macbeth et al. carry out an experiment on DeMorgan’s laws and interpret that their results support the mental models theory and undermine formal rules theories such as that of Rips. In this paper, I try to show that, although Macbeth et al.’s results are clearly consistent with the mental models theory and enable to question Rips’ approach, they are not incoherent with other formal or syntactic frameworks; in particular, they are not inconsistent with the mental logic theory. Thus, I comment some aspects of this last theory that are often misinterpreted and misunderstood.

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