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Effects of Prime Type and Delay on Multiplication Priming: Evidence for a Dual-process Model

Two experiments investigated effects of numerical primes on production of simple multiplication facts (e.g. 4 × 8 = ?). In Experiment 1, a correct (32), related (24), unrelated (27), or neutral (##) prime appeared for 200 msec and was followed by a target problem at an ISI of 0, 750, or 1500 msec. Relative to neutral primes, correct primes produced constant RT and accuracy benefits across ISIs, and unrelated primes produced constant RT costs. Related primes produced costs compared to unrelated primes at the 0-msec ISI only. In Experiment 2, eliminating correct-answer primes from the stimulus set eliminated all the false-prime effects except the costs of related primes at the 0-msec ISI. We propose a dual-process account incorporating a familiarity-based name-the-prime strategy that produces benefits and costs insensitive to ISI and an automatic retrieval-priming process that is measurable only at short ISIs.