Estimating frequency of occurrence.

Various models have been proposed that attribute judgments of frequency of occurrence either to the direct coding of frequency information or to the estimation of frequency from characteristics of memory traces that are not direct frequency codes. We present three experiments that replicate and further explore a phenomenon that is significant in the distinction between direct and indirect models of frequency coding. The phenomenon is that deeper processing of stimulus material results in superior judgments of frequency for that material than does shallower processing. This effect is at least partly attributable to the number of associations that are generated by deep analysis. The results of the present experiments thereby implicate an indirect coding mechanism underlying frequency judgments. However, we also show that there is ample reason to suppose a contribution of a direct coding mechanism as well. The most reasonable view, therefore, is that multiple mechanisms are involved in the registration of frequency of occurrence.

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