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. 2020 May 8;11:2313. doi: 10.1038/s41467-020-15146-7

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 5 — a Example of the 2-back memory task. Subjects view a sequence of stimuli (letters) and respond to each stimulus indicating whether it matches the target stimulus from two trials before. For each positive response that the current stimulus matches the target, we measure Δt by calculating the number of trials between the last instance of the current stimulus and the target. b Histograms of Δt (i.e., measurements of the memory distribution P(Δt)) across all subjects in the 1-, 2-, and 3-back tasks. Dashed lines indicate exponential fits to the observed distributions. The inverse temperature β is estimated for each task to be the negative slope of the exponential fit. c Memory distribution aggregated across the three n-back tasks. Dashed line indicates an exponential fit. We report a combined estimate of the inverse temperature β = 0.32 ± 0.01, where the standard deviation is estimated from 1000 bootstrap samples of the combined data. Measurements were on independent subjects. Source data are provided as a Source Data file.