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. 2021 Jan 28;11:2446. doi: 10.1038/s41598-021-81901-5

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© The Author(s) 2021

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Demonstration of a syntactic tree for an example sentence from^8,9. The sentence is composed of a noun phrase and a verb phrase, each consisting of two words presented at a rate of 3.125 Hz. The sentence is described using a hierarchical tree that splits the sentence first into a noun phrase and a verb phrase and then into words. This is a particularly simple tree, more complex trees may have more branches. This simple structure is convenient for frequency tagging and the different frequencies corresponding to the three levels of the tree, sentence, phrase and word, have been marked here.