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. 2017 Apr 28;32(3):274–286. doi: 10.1177/0748730417696787

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© 2017 The Author(s)

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (http://www.creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access page (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 1. — Graphic overview of information flow at each model iteration. On a per-minute basis, Kronauer’s model evaluates the effect of light (in lux) on the circadian pacemaker. When light is presented to the model, process L generates a drive $\hat{B}$ , which is influenced by both the current intensity of light and the state of adaptation. This drive $\hat{B}$ is then altered by a stimulus modulator, based on the current phase and amplitude of the pacemaker, resulting in a modulated drive B. Drive B in turn affects the speed and amplitude with which the pacemaker oscillates.