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Neural evidence for boundary updating as the source of the repulsive bias in classification

Heeseung Lee, Hyang-Jung Lee, Kyoung Whan Choe, Sang-Hun Lee
doi: https://doi.org/10.1101/2023.01.11.523692
Heeseung Lee
1Department of Brain and Cognitive Sciences, Seoul National University, Seoul, Republic of Korea
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Hyang-Jung Lee
1Department of Brain and Cognitive Sciences, Seoul National University, Seoul, Republic of Korea
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Kyoung Whan Choe
1Department of Brain and Cognitive Sciences, Seoul National University, Seoul, Republic of Korea
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Sang-Hun Lee
1Department of Brain and Cognitive Sciences, Seoul National University, Seoul, Republic of Korea
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  • For correspondence: visionsl@snu.ac.kr
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Abstract

Binary classification, an act of sorting items into two classes by setting a boundary, is biased by recent history. One common form of such biases is repulsive bias, a tendency to sort an item into the class opposite to its preceding items. Sensory-adaptation and boundary-updating are considered as two contending sources of the repulsive bias, yet no neural support has been provided for either source. Here we explored human brains, using fMRI, to find such supports by relating the brain signals of sensory-adaptation and boundary-updating to human classification behavior. We found that the stimulus-encoding signal in the early visual cortex adapted to previous stimuli, yet its adaptation-related changes were dissociated from current choices. Contrastingly, the boundary-representing signals in the inferior-parietal and superior-temporal cortices shifted to previous stimuli and covaried with current choices. Our exploration points to boundary-updating, rather than sensory-adaptation, as the origin of the repulsive bias in binary classification.

Competing Interest Statement

The authors have declared no competing interest.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted January 13, 2023.
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Neural evidence for boundary updating as the source of the repulsive bias in classification
Heeseung Lee, Hyang-Jung Lee, Kyoung Whan Choe, Sang-Hun Lee
bioRxiv 2023.01.11.523692; doi: https://doi.org/10.1101/2023.01.11.523692
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Neural evidence for boundary updating as the source of the repulsive bias in classification
Heeseung Lee, Hyang-Jung Lee, Kyoung Whan Choe, Sang-Hun Lee
bioRxiv 2023.01.11.523692; doi: https://doi.org/10.1101/2023.01.11.523692

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