A Simple Microelectrode for recording from the Central Nervous System

METAL microelectrodes suitable for recording from single cells externally or after penetration have been described by various authors1–3. The procedures of Svaetichin2 and Grundfest1 call for special apparatus, and the method of Hubel3, employing tungsten, in our hands gives rather noisy electrodes which are difficult to straighten. Steel electrodes, which have the advantages of low noise, low electrode potential, ease of straightening and, in particular, offer the possibility of accurate localization of the recording site, may be made as follows.