Transcutaneous recording of single neuron activity in the cerebral cortex of the monkey

A new method is described for recording responses of single neurons in the monkey's cerebral cortex by passing a microelectrode directly through the overlying skin and dura. Previous to this recording a window had been cut in the calvarium, and the bone deficit repaired using a full-thickness skin graft. Stable unitary recordings have been made over a period of one year following craniotomy, the only skull attachment being a small stainless steel peg, on which the microdrive was mounted when required.