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. 2024 Feb 19;17:73–87. doi: 10.2147/MDER.S452938

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© 2024 Teo et al.

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(A) Unfiltered optical signals demonstrating the right and left brain responses to a Lundberg B wave (red arrow). Filtered left (B) and right (D) brain pulsatile component. Left (C) and right (E) brain continuous wavelet transformation (CWT) demonstrating the presence of a high amplitude left cardiac signal (yellow band, [1, 1.5] Hz) and absence (absent band) or reduced amplitude (green band) of the right cardiac signal. (F) Concurrent ICP recording of Lundberg B wave (red arrow).

Abbreviations: a.u, arbitrary units; CWT, continuous wavelet transform; DS ratio, diastolic-systolic ratio; Hz, hertz; ICP, intracranial pressure mmHg, millimetres of mercury; s, seconds.