Motor activity in gamma and high gamma bands recorded with a Stentrode from the human motor cortex in two people with ALS, Kacker, Kriti, Chetty, Nikole, Feldman, Ariel K, Bennett, James, Yoo, Peter E, Fry, Adam, Lacomis, David, Harel, Noam, Nogueira, Raul G, Majidi, Shahram, Opie, Nicholas L, Collinger, Jennifer, Oxley, Tom, Putrino, David, Weber, Douglas J