The infant as philosopher

Cognitive Science Visual behaviors, such as a shift in one's gaze or a prolonged stare, can be diagnostic of internal thoughts. Cesana-Arlotti et al. used these measures to demonstrate that preverbal infants can formulate a logical structure called a disjunctive syllogism (see the Perspective by Halberda). That is, if A or B is true, and A is false, then B must be true. Presenting infants with scenes where the outcome revealed B to be false evoked looks of surprise. Science , this issue p. [1263][1]; see also p. [1214][2] [1]: /lookup/doi/10.1126/science.aao3539 [2]: /lookup/doi/10.1126/science.aas9183