fMRI

MRI shows brain structure, fMRI shows brain activity. Here's how both work, what fMRI can and can't tell us, and how it compares to PET, EEG, and MEG.

The Default Mode Network activates when you're not focused on the world. What it is, what it does, and why depression, Alzheimer's, and psychedelics all touch it.

Deep learning systems can now turn brain recordings into text, speech, and rough images. Here is how it works, what it needs, and where it stops.