Greater sensitivity in separation discrimination with closer spacing of separation levels tested.

In fact, for the more-closely spaced condition of Experiment 1, the slope did not vary across the session, F(3,147) < 1 (See Figure 5 ), and, for the more-closely spaced condition of Experiment 2, the slope showed a nearly significant pattern of decrease across the session, linear component: F(1,49) = 7.13, MSe = 2.66, p = 0.01, overall effect: F(3,147) = 2.52, MSe = 2.68, = 0.06 (See Figure 6 ) .

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Further, the standard deviation of mu showed a trend toward being larger in the less than in the more-closely spaced condition (this result was not quite significant for either of the separation levels given the Bonferroni correction).

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