Problem regarding the EEG signals captured
recently, I brought an OpenBCI headband kit with 8 electrodes. when I record the EEG signals and plot it it with mne the signal showed an uptrend as in the image EEG_raw_signal. the signal was saved in the format of .bdf. same problem goes when I save the file with OpenBCI txt form.
I tried to plot the Power Spectral density plot too and in the plot it shows that the power is gone below 0 as shown in the image EEG_raw PSD.
This is the hardware set up of the device (hardware setup).
please give me a solution to this problem.