In each of two experiments, the comparative instructions in a symbolic comparison task were either varied randomly from trial to trial (mixed blocks) or left constant (pure blocks) within blocks of trials. In the first experiment, every stimulus was compared with every other stimulus. The symbolic distance effect (DE) was enhanced, and the semantic congruity effect (SCE) was significantly larger, when the instructions were randomized than when they were blocked. In a second experiment, each stimulus was paired with only one other stimulus. The SCE was again larger when instructions were randomized than when they were blocked. The enhanced SCE and DE with randomized instructions follow naturally from evidence accrual views of comparative judgments.

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Journal Memory & Cognition
Shaki, S. (Samuel), Leth-Steensen, C, & Petrusic, W.M. (William M.). (2006). Effects of instruction presentation mode in comparative judgments. Memory & Cognition, 34(1), 196–206. doi:10.3758/BF03193398