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. Author manuscript; available in PMC: 2010 Dec 1.
Published in final edited form as: J Exp Psychol Hum Percept Perform. 2009 Dec;35(6):1865–1897. doi: 10.1037/a0016926

Figure 15.

Figure 15

Comparison of signal detection RT density to RT densities in all two-alternative forced-choice conditions of Experiment 2. Left panel: mean RSI = 500 msec. Middle panel: mean RSI = 1 sec. Right panel: mean RSI = 2 sec. As the stimulus-ratio asymmetry increases, the RT density for two-alternative decisions approaches that for the signal detection condition. This change in the RT density becomes more pronounced as the mean RSI decreases. In addition, a bimodal density appears for conditions with unequally likely stimuli, suggesting a mixture of integrative and non-integrative responding. The non-integrative modes increase in amplitude (and the integrative modes decrease) as the asymmetry in stimulus ratios increases and as the mean RSI decreases.