Figure 2. Mental algorithm underlying the MFT-M.

(a) An illustration of the grouping search strategy. Participants repeatedly sample stimuli with a majority size until a congruent sample is obtained. n_sti: number of stimuli in one sample. N_maj: majority size. T: true. F: false. The average entropy (b) and average information rate (R) (c) in different conditions of the MFT-M, estimated according to the grouping search algorithm. (d) An illustration of the time-constrained grouping search algorithm. The sampling process is voluntarily terminated (VT) when a congruent sample is obtained, or forcedly terminated (FT) when stimuli have disappeared. A VT will lead to a correct response, while a FT will lead to a random response.