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. 2020 Jul 16;14:271. doi: 10.3389/fnhum.2020.00271

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Copyright © 2020 Fresnoza, Christova, Purgstaller, Jehna, Zaar, Hoffermann, Mahdy Ali, Körner, Gallasch, von Campe and Ischebeck.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Response times for multiplication and subtraction problems, depending on time and site of stimulation, separated for operation and strategy. The x-axis displays the time points. The y-axis represents the reaction times (RTs) normalized concerning the respective RT before the stimulation (RT during and after stimulation/RT before stimulation). (A) Multiplication: The stimulation of the AG inhibited the online calculation and retrieval of solutions for multiplication problems. The stimulation of the hIPS and vertex did not inhibit online calculation and retrieval. (B) Subtraction: stimulation of the AG inhibited the retrieval of solutions to subtraction problems during stimulation. Stimulation of the hIPS had no detrimental effect on online calculation or retrieval. Error bars represent the standard error of the mean. hIPS, the horizontal segment of the left intraparietal sulcus; AG, angular gyrus.