Fig. 6.

Constructing ancestor and descendants of star-like Amoeba shapes. (a) Equidistant symmetric star-like shapes defined by number of corners, p, across; inner:outer vertex radius ratio, IR:OR, down; and sharpness-roundness level, within each square. (b) Examples of ancestors, constructed from symmetric star-like shapes by general rotation; rotating local outer vertices individually; and shifting local vertex radii inward or outward (decreasing and increasing them, respectively). (c) Illustration of ancestor modification for Experiment 2, creating its descendants by increasing or decreasing local Inner or outer vertex radii, respectively, general rotation and/or local vertex point rotation. (d) Illustration of Experiment 2 trial paradigm: RSVP (100 ms/shape + 100-ms ISI; up to two changes/stimulus) followed by a two-alternative forced-choice (2-AFC) membership task