Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2021 Aug 5;15:673369. doi: 10.3389/fnins.2021.673369

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

Copyright © 2021 Juan, Nguyen, Liang, Quinn, Chen, Muggleton, Yeh, Woolrich, Nobre and Huang.

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.

PMC Copyright notice

Illustration of HHSA on a synthesized data with the sum of three oscillators (i.e., x(t) = x_fP(t) + x_fA1(t) + x_fA2(t)). (A) The synthesized PAC data, in which theta phase was coupled with low and high gamma along with their corresponding HHT and HHS (lower panels). The HHT shows time-frequency characteristics of the simulated data, in which the amplitude increases at fP, fA1, and fA2 could be seen over time, corresponding to the original properties of the signals (amplitude modulation). The HHS shows the distinct peaks at f_P, f_A1, f_A2, f_AM1, f_AM2. (B) The synthesized PAC data, in which low gamma was modulated by 4 Hz (f_AM1) and 8 Hz (f_AM2) along with their corresponding HHT and HHS (lower panels).