Sequential effects and memory in category judgments
2 studies with 3 undergraduates each investigated the effects of previous stimuli on responses in an absolute judgment of loudnesses situation when feedback was and was not provided. Whether or not information feedback was provided, responses were assimilated to the value of the immediately previous stimulus in the series. The effects of stimuli more than 1 trial back in the sequence depend on the presence or absence of feedback. When the entire stimulus scale was shifted up or down to 5 db. from the level on the previous day, a substantial shift occurred in the constant error of judgment in the direction of the scale shift, providing evidence that a relatively long-term (24-hr) memory process was being used in the judgment situation. None of the currently available models is adequate to account for both these results and those of earlier studies. The form of the sequential dependencies observed may depend at least partially on the presence or absence of an identification function from stimuli to responses. (18 ref.) (PsycINFO Database Record (c) 2006 APA, all rights reserved). © 1970 American Psychological Association.
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