Possibly. But it seems to me to hinge upon whether surface-level signals can convey the information of interest. How deep is the cortex and how far in can we de

Possibly. But it seems to me to hinge upon whether surface-level signals can convey the information of interest. How deep is the cortex and how far in can we detect signals? What kind of resolution is practical or even possible in theory? I would imagine the electromagnetics get fairly fuzzy fast, depending on your time resolution.