Recently, I was playing with extracting brain activity using ICA (I know that some use SSD, but I use ICA).
Here's one example from the dataset with somatosensory stimulation. There are several components over the right somato-motor area (where the brain responds to stimulation).🧐
#brainmovie

Nick (@willenjoy.bsky.social) is obsessed with signal-to-noise ratio (SNR). And for good reason! It could explain many results. Our simulation toolbox meegsim enables setting up SNR of individual sources as well as SNR of all signal sources with respect to all noise sources.
meegsim.readthedocs.io

We (I and @willenjoy.bsky.social) created a toolbox for simulations of EEG/MEG because we needed to simulate data. Our initial aim was to simulate connectivity. For this short clip, I simulated two sources with phase connectivity using our toolbox.
#brainmovie
meegsim.readthedocs.io/en/stable/in...

Simulations are fun! Especially with the right tools😉.
@willenjoy.bsky.social and I (with support from Mina Jamshidi) made a toolbox for simulating EEG/MEG data
meegsim.readthedocs.io
I put together a quick simulation using it for this short clip. Took me 10 minutes (no, really!)
#brainmovies

And here's the brain response to a very weak stimulus that participants could not have felt. But they said they did. What were they thinking? #brainactivitymovie
(there is a little slowdown before and after stimulus onset that is for presentation purposes; there is no slowdown in brain activity😆)

Here's the brain response to a clearly detectable electrical stimulus. However, the participant said that they didn't feel it. How come?
The topography is very similar to an undetectable stimulus. Maybe, they were telling the truth...
#brainactivitymovie

Here's brain response in MEG to a stimulation of left median nerve. When median nerve is electrically stimulated, you feel tingling in the thumb, and the thumb may twitch. The brain response shows clear lateralization in the early stages. The stimulus here was supra-threshold.⚡
#brainactivitymovie

Here's the brain's response to electrical stimulus that was of such a small intensity that it is highly unlikely that participants had detected it. And participants confirmed that they didn't feel the stimulation. Time 0 s is the stimulus presentation. #brainactivitymovie

Here's the brain's response to electrical stimulus applied to a left index finger in EEG. Time 0 s is the stimulus presentation.
The activity before 0 is also structured. Possibly, participants were expecting the stimulus to arrive.
#brainactivitymovie

Here's brain response to simple auditory tone in MEG (magnetometers). Time 0 s is the tone.
The paradigm was passive, no response was requested from the participant. "Just" perception.
#brainactivitymovie

Here's MEG (magnetometers) signal evolution over time and space before the button press. Time 0 s is the button press.
It is similar and yet different from EEG.
#brainactivitymovie

Here's EEG signal evolution over time and space before the button press.
Time 0 s is the button press. Blue colors mean that EEG amplitude is negative. #brainactivitymovie