A sweet new multiple electrode for chronic single unit recording in moving animals

A multiple electrode assembly is described. It is composed of individually-insulated fine wires for isolation of single brain units in freely behaving animals and makes possible continuous recording from the same single unit over long periods of time. Seven or more fine (25 μm dia.) individually teflon coated platinum iridium monofilaments are inserted through the lumen of a 26 gauge stainless steel hypodermic tube, cut to the desired length, and fused into a single rigid shaft by coating in melted dextrose. The electrode is entirely prefabricated and the wires are implanted simultaneously in a selected brain area. The sugar gradually dissolves and units can be recorded within 48 hr.