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. 2019 Jan 24;9:593. doi: 10.1038/s41598-018-37561-z

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© The Author(s) 2019

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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Coordination of task triggers to the RNS System iEEG (ECoG). (A) Example of RNS System iEEG recording during the Face-Profession Task. Trigger markers are seen as sudden signal dropouts (“telemetry artifacts”) in the recording and were delivered at the stimulus onset. As the RNS System records a maximum of 4 minutes of iEEG data at a time, each experimental block (either encoding or retrieval) was designed to be less than 4 minutes long. Triggers were sent via the programmer accessory (PA) to the wand accessory (WA), to mark the real-time ECoG with each stimulus onset. At the end of each experimental block, the task software commanded the PA to pause, store, and restart recording. This design allowed for continuous behavioral testing, task-locked ECoG recording, and avoidance of iEEG data loss. (B) Sample RNS System iEEG recording from 4 leads showing closeup of telemetry markers. Top 2 channels are recording from the hippocampal depth electrode. Bottom 2 channels are recording from the middle temporal gyrus. Faces in Panel A are reused from the Chicago Face Database (CFD) under the Creative Commons Attribution 4.0 open access license¹⁵.