Heuristics is the process by which humans use mental shortcuts to arrive at decisions. Heuristics are simple strategies that humans, animals, organizations, and even machines use to quickly form judgm
Figure 1: Screening for HIV in the general public follows the logic of a fast-and-frugal tree. If the first enzyme immunoassay (ELISA) is negative, the diagnosis is "no HIV." If not, a second ELISA is performed; if it is negative, the diagnosis is "no HIV." Otherwise, a Western blot test is performed, which determines the final classification.
A visual example of attribute substitution. This illusion works because the 2D size of parts of the scene is judged on the basis of 3D (perspective) size, which is rapidly calculated by the visual system.