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Confirmation bias through selective readout of information encoded in human parietal cortex
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Abstract
Decision-makers often process new evidence selectively, depending on their current beliefs about the world. We asked whether such confirmation biases result from biases in the encoding of sensory evidence in the brain, or alternatively in the utilization of encoded evidence for behavior. Human participants estimated the source of a sequence of visual-spatial evidence samples while we measured cortical population activity with magnetoencephalography. Halfway through the sequence, participants were prompted to judge the more likely source category. We find that processing of subsequent evidence depends on its consistency with the previously chosen category. Evidence encoded in parietal cortex contributes more to the estimation report when that evidence is consistent with the previous choice compared to when it contradicts that choice. Our results indicate that information contradicting pre-existing beliefs has little impact on subsequent behavior, despite being precisely encoded in the brain. This provides room for deliberative control to counteract confirmation biases.
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![Fig. 1 Task design and behavior. a Schematic sequence of events in example trial. Visual evidence samples (polar angles from vertical reference line, of small discs at 5° of eccentricity) are drawn from Gaussian distributions. After the sequence, participants report their inference about the underlying source (distribution mean) by moving a joystick. After six samples, participants either report a categorical judgment about the source, or receive a categorical cue (see main text). After cue presentation, participants make a pre-assigned (left or right, blocked) button press, to match Choice and Cue conditions in terms of motor output. b Range of generative means (μ) and standard deviation (σ). Red font indicates the near-zero generative mean trials used for consistency effect analyses (−4° to 4°) (c) Accuracy of the intermediate choice and reliability of the cue for the near-zero trials indicated in (b). d Proportion of “right” choices as a function of generative mean (Choice; first 6 samples). For comparison, the fraction of “right” Cues are plotted against the first 6 sample mean for Cue. Lines: fits of a sigmoid function on group data. Dots are group averages. e−i Quantification of estimation biases. e Distributions of estimates as a function of generative mean for Cue condition. Estimates were first z-scored and binned before pooling probability densities across participants. f Same as (e), for Choice. g Distributions of estimates collapsed across generative means for Cue (gray) and Choice (black). P-values, Hartigan’s dip test of unimodality. h Mean estimates for trials with ‘left’ and ‘right’ choice or cue categories on near-zero trials. Data points, participants; p-values, two-sided permutation tests. i Difference of mean estimates between ‘right’ and ‘left’ categories (as in (h)), as function of the strength of category evidence (binned). Lines, group average; error bars, SEM; statistics: interaction condition x evidence strength, two-factorial ANOVA, ηp2 = 0.05; 95% CI: [−0.096, 0.195]). Inset, ideal observer prediction (see main text). N = 30 participants for all panels except (c, e, i): N = 27 (excluding three participants with different spacing of generative means not suited for the corresponding analysis; Methods).](/paper-figures/23d29a3ccce84470ba8e8bf4322bbb08/confirmation-bias-through-selective-readout-of-information-encoded-in-human-figure-1.jpg)




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“The target variable (visual sample orientation) was drawn from a Gaussian distribution by experimental design.77”
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Sorted by citations
Sampling bias corrections for discrete and Gaussian partial information decompositions
Lorenz, G. M., Engel, N. M., Koçillari, L., Celotto, M., Orsenigo, D., Curreli, S., Malerba, S. B., Engel, A. K., Kayser, C., Fellin, T., et al. (2026) · Patterns · doi:10.1016/j.patter.2026.101619 · Cited by 9
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Metadata
- Authors
- Park, H., Arazi, A., Talluri, B. C., Celotto, M., Panzeri, S., Stocker, A. A., & Donner, T. H.
- Venue
- Nature Communications
- Published
- 2025-06-25
- Volume
- 16
- Issue
- 1
- ISSN
- 2041-1723
- PMC
- PMC12198416
- Cited by
- 10
- References
- 6
- Language
- en
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