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Cardinal bias interacts with the stimulus history bias in orientation working memory

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Abstract

Reports in a visual working memory(WM) task exhibit biases related to the categorical structure of the stimulus space (e.g., cardinal bias) as well as biases related to previously seen stumuli (e.g., serial bias). While these biases are common and can occur simultaneously, the extent to which they interact in WM remains unknown. In the present study, I used orientation delayed estimation tasks known to produce both cardinal and serial biases and found that the serial bias systematically varied based on the relative positions of the cardinal axis and the preceding stimulus in orientation space. When they were positioned in a way that generated cardinal and serial biases in the same direction (i.e., on the same side of the target orientation), reports for the target orientation exhibited a regular repulsive serial bias. However, when their positions resulted in the biases in the opposite directions (i.e., on the opposite side of the target orientation), no serial bias occurred. This absence of serial bias was replicated in a follow-up experiment where the locations of the stimulus orientation and the response probe were completely randomized, suggesting that the interaction occurs independently from location-based response preparation processes. Together, these results demonstrate that the prior stimulus and the cardinal axis impose interactive impact on the processing of new stimulus, producing differential patterns of serial bias depending on the specific stimulus being processed. These findings place significant implications on computational models addressing the nature of the stimulus history effect and its underlying mechanisms.

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Data availability

Data is available at https://osf.io/s6p7x/.

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Data were analyzed using R (Version 4.1.2).

Notes

  1. The present study focuses on the trial history bias that goes away from the previous-trial stimulus. However, research on serial dependency found that the reports of the current-trial stimulus were biased toward the previous-trial stimulus (Fischer & Whitney, 2014). The exact nature of the opposing directions of the stimulus history effect is not yet confirmed and studies suggest that the repulsive bias may be driven by mechanisms that differ from those underlying attractive serial dependence. Therefore, the present study uses the term repulsive serial bias to differentiate the repulsion bias from serial dependence. See the General Discussion for more discussions on this issue.

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The data and materials for all experiments are available at https://osf.io/s6p7x/.

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Correspondence to Gi-Yeul Bae.

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Significance statements

The orientation representation in perception is influenced by two sources of bias: the cardinal axis and stimulus history. However, there has been a lack of research examining how these two factors collectively impact the processing of new stimuli in a given task. In the present study, I discovered that the two biases interact systematically in a stimulus-specific manner, resulting in a nonuniform stimulus history effect. This finding has important implications for theories that seek to understand the nature of the stimulus history effect and the mechanisms underlying it.

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Bae, GY. Cardinal bias interacts with the stimulus history bias in orientation working memory. Atten Percept Psychophys 86, 828–837 (2024). https://doi.org/10.3758/s13414-024-02867-w

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  • DOI: https://doi.org/10.3758/s13414-024-02867-w

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