Serial dependence: How past perception affects future perceptions and decisions

Abstract

This thesis examines the phenomenon of serial dependence, which is a cognitive bias that occurs when previous perceptions influence the way present information is processed, influencing perception and decision-making. The specific point at which serial dependence develops is uncertain. This study examines the impact of increased uncertainty on the relationship between serial dependence and working memory capacity, particularly when individuals are required to hold 3-5 items in memory for distinct tasks. Furthermore, this study examines the effects of retaining similar items in working memory on perception, decision-making, and serial dependence. Participants participated in three experiments conducted on separate days for the purpose of this study; the participants were not informed of the order in which the experiments were performed. The individuals engaged in a series of tasks utilizing Gabor patches to alter the workload on their working memory while they estimated their orientation. Complex visual comparisons, such as distinguishing between the sizes of circles or the orientations of lines, were among the more difficult tasks. The findings indicate a distinct correlation between the level of serial dependence and the workload on working memory; as workload increased, so did serial dependence. Notably, when presented with similar objects in their memories for two distinct tasks, participants displayed a repulsive effect, exaggerating differences to avoid confusion. The findings of this study highlight the impact of memory load on perception and decision-making. They indicate that visual working memory and serial dependence are closely interconnected, especially under conditions of high cognitive demand.