Re Q drop 'hole is deep'
MicroECog
http://www.virtualworldlets.net/Resources/Hosted/Resource.php?Name=MicroECoG
DoE has some input
High Fidelity Neural Recordings Using Wireless ECoG Microelectrode Arrays
-https://neurotech.llnl.gov/projects/ecog
Human neocortical electrical activity recorded on nonpenetrating microwire arrays: applicability for neuroprostheses
-https://thejns.org/focus/view/journals/neurosurg-focus/27/1/article-pE9.xml?cookieSet=1&prevSearch=allfield:(Greger)&searchHistoryKey=