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Magnitude production and estimation data from the same subjects are analyzed in three ways. The coefficient of variation of the ratio of successive responses (numbers in estimation. SPL in production) are compared; both exhibit, as a function of stimulus difference, the V-shaped pattern previously found in estimation data. A multiple regression of responses on the stimulus and on these events of the previous trial exhibit similar patterns, although the effects of the previous trial in production are somewhat less. The correlation between successive responses, averaged over constant stimulus differences, are very large for small differences and about zero for large ones. These somewhat surprisng results for production are examined from the point of view of an intensity attention band hypothesis. We have previously investigated the variability of individual judgments of loudness in a magnitude- estimation task (Green & Luce, 1974). Later, we examined the sequential effects present in such in- dividual judgments and how those effects could be characterized and analyzed (Jesteadt, Luce, & Green, 1977). This paper reports data on individual adjust- ments of loudness in a magnitude-production experi- ment, together with magnitude-estimation data from the same subjects. Both variability and the sequential effects present in the production and the estimation task are compared. The paper is organized as follows: The procedures used to collect the data in the two experiments are first described. Then the results from the two experi- ments are compared as to mean responses, the vari- ability of the individual judgments, and the se- quential effects. PROCEDURE

Variability and sequential effects in magnitude production and estimation of auditory intensity