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193463 https://hdl.handle.net/2286/R.2.N.193463 http://rightsstatements.org/vocab/InC/1.0/ All Rights Reserved 2024 35 pages Masters Thesis Academic theses Text eng Chen, Kuo-Wei Bae, Gi-Yeul GB Brewer, Gene GB McBeath, Michael MM Benitez, Viridiana VB Arizona State University Partial requirement for: M.A., Arizona State University, 2024 Field of study: Psychology Human perception of the new stimulus is influenced by the prior perceptualexperience, resulting in either attraction toward or repulsion away from the past experiences- an effect known as serial bias. Predominant theories of serial bias propose that these opposing biases originate from distinct information processing stages. However, the role of working memory (WM) maintenance in serial bias is not wellunderstood, despite the fact that the majority of serial bias studies incorporate a WM delay in the task paradigm. Moreover, the mechanism underlying the generation of serial bias remains unclear. To address these questions, the present study used a dual-task approach, where participants performed an intervening Stroop task during the delay of an orientation delayed estimation task to disrupt the WM maintenance. In addition to analyzing serial bias in the final report, I examined the response trajectory of orientation reports to investigate how serial bias is generated during the response period. Across three experiments, I found that interrupting WM maintenance resulted in attractive serial bias, while uninterrupted WM maintenance led to repulsion. Critically, both attractive and repulsive serial biases exhibited a similar curvature pattern in response trajectories. These findings demonstrated that the direction of serial bias is determined by how the stimulus is maintained in WM, and the final bias emerges through decision-related processes during the response. Cognitive Psychology Working Memory Maintenance Modulates the Direction of Serial Bias Through Systematic Response Adjustments During Post-Perceptual Decision