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. 2018 Dec 17;9:1093. doi: 10.3389/fneur.2018.01093

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Copyright © 2018 Wang, Huang, Wang, Wang, Ji, Pan and Wu.

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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Representative figures of 40-Hz steady-state responses (SSRs) in 3 grades. (A) Grade I: normal 40-Hz SSR: 4 sine waves appearing regularly in 100 ms with settled intervals, with a comparable amplitude on both sides. (B) Grade II: unilateral abnormal 40-Hz SSR: sine waves on the left side are extinct, while 4 sine waves appear regularly on the right side in 100 ms with settled intervals and normal amplitude. (C) Grade III: bilateral abnormal 40-Hz SSR: sine waves are extinct bilaterally.