A huge amount of progress has been made in this area. The most promising report I've seen was in Nat Methods a few weeks ago: "we demonstrated stable multiplex

A huge amount of progress has been made in this area. The most promising report I've seen was in Nat Methods a few weeks ago: "we demonstrated stable multiplexed local field potentials and single-unit recordings in mouse brains for at least 8 months without probe repositioning" http://www.nature.com/nmeth/journal/v13/n10/full/nmeth.3969.html http://www.nature.com/nmeth/journal/v13/n10/full/nmeth.3969....