Frequency Power of the brain waves along the infarction progression (12 h)
Steps to reproduce
To study infarct progression, 5-min ECoG signal segments were obtained 5 min before MCAo, as well as 5 min and 4, 8, and 12 after MCAo. For signal decomposition, the discrete 512-point Fourier transform (Hanning window) was computed for each data segment and, subsequently, the power spectrum. For each segment, we estimated the mean power spectrum corresponding to each frequency band: delta (0.1–4 HZ), theta (4–7 Hz), alpha (8–12 Hz), beta (13–31 Hz), and gamma (32–45 Hz). The power calculation was performed using customized MATLAB programs (MathWorks, Natick, MA) (Figure 2C). To determine infarct progression, the frequency power of the brain waves was calculated every 4 h starting from the MCAo, with four timepoints plus the baseline obtained 5 min before the MCAo. For each pig (n = 6), the power spectrum of each brain wave was calculated for each timepoint to obtain a dataset of six elements for each timepoint.