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. Author manuscript; available in PMC: 2018 Jan 1.
Published in final edited form as: Mem Cognit. 2017 Jan;45(1):12–25. doi: 10.3758/s13421-016-0638-3

Figure 2.

Figure 2

Left Panel. Category structure used in Ashby and O’Brien (2007). Plus-signs represent Category A stimuli and dots represent Category B stimuli. The optimal linear bound is denoted by the solid diagonal line. The dashed gray line is imposed on the category structure to represent the distinction between easy and hard trials; harder trials are located closer to the optimal linear bound while easier trials are located farther from the bound. The remaining panels represent the category structures used in Experiment 1 (middle Panel), and Experiments 2 and 3 (right panel), based on 400 randomly sampled category A (dots) and category B stimuli (crosses).