Using SPRiNT in Brainstorm - problem with TFR

Discussions
1

Hello!

I have recently started using Brainstorm in order to explore the newly implemented SPRiNT tool. When I run it on my data (1 ECoG channel) I see a strange tfr plot, namely, it has very high power values in the higher end of the calculated frequency band (in this case 40-50 Hz) but the power spectrum doesn't show that. Also, I have tfr plots calculated by Morlet wavelet function in MNE, which also looks different and doesn't show these high-power regions on top of the plot. Do you have any idea of what these could be?

I attach the screenshots of the parameters for SPRiNT (all default), the resulting tfr in brainstorm, the power spectrum and the tfr-plot from MNE for the corresponding data set. (all pre-processing is exactly the same, namely resampling at 600Hz and high pass filter at 2Hz)

I will appreciate any comments or help on this! Thanks!

ECOG_TF_Subject02_raw_ecog34_sub2_SPRiNT_ECoG__3-50Hz
ECOG_TF_Subject02_raw_ecog34_sub2_SPRiNT_ECoG__3-50Hz1444×996 98.5 KB

0GQFdSIi6mVYYP5UjS093BIaT.jpeg)

PS
I can only upload one screenshot since I am a new user, how can I go around this?

2

SPRiNT parameters: (default)

screenshot SPRiNT
screenshot SPRiNT1088×1552 106 KB

3

Power spectrum:

Power spectrum
Power spectrum1504×804 105 KB

0GQFdSIi6mVYYP5UjS093BIaT.jpeg)

4

TFR obtained with Morlet-wavelet in MNE:
wavelet_tfr_decim_600_n7_medoff_sub2_50

5

Thanks for posting and welcome to the forum!
To assess consistency, please produce the Morlet tfr of the same time series with Brainstorm as well.
Tagging @Luc here, who is the GrandMaster of all Things concerning SPRiNT.

6

Sorry for the late reply (I need to figure out notifications for the forum).

My first guess is that the TF maps in brainstorm are set to display absolute values: could you check whether this is the case in your client, please? If you right-click and navigate to Colormap:Timefreq, is Absolute values enabled?