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. 2019 Apr 17;5(4):eaav3816. doi: 10.1126/sciadv.aav3816

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Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.

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Fig. 5 — (A) Analytical model of cortical hemodynamic response function (HRF) based on measurements by Tian et al. (3). a.u., arbitrary units. (B to D) Convolution of the HRF analytical expression with stimulus switching at different values of f_s. The code used to calculate these graphs was obtained from www.fil.ion.ucl.ac.uk/spm/software/spm12/. The change in the hemodynamic response between the stimulus ON and OFF states is significant for (B) and negligible for (C) and (D).