Goldstein S R, Bak M J, Oakley J C, Schmidt E M, Van Buren J M
Electroencephalogr Clin Neurophysiol. 1975 Dec;39(6):667-70. doi: 10.1016/0013-4694(75)90081-4.
An instrument has been developed for positioning microelectrodes near neurons in the exposed pulsating cerebral cortex of man or animals. The electrode moves with the cortex and maintains a fixed relationship with the desired neuron. Stable extracellular single cell recordings have been obtained for 17.5 min from an exposed human brain that pulsated 1.5 mm at the surface.