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Sample stimuli patterns. Artificial patterns were generated and used for stimuli: (a) no pattern (NP), (b) background matching (BM), (c) step edge (SE), (d) step centre (SC), (e) graduating edge (GE), (f) graduating centre (GC), (g) disruptive edge (DE), and (h) disruptive centre (DC). Each pattern implements a camouflage strategy previously proposed in the literature.
