A Simple Microelectrode Bundle for Deep Brain Recordings

A simple method to produce multi-wire bundles by spinning is demonstrated, yielding nine recording sites. These so called "niotrodes" are then used in an acute experiment to record from several positions along trajectories into rat\´s basal ganglia. Niotrodes with an impedance in the range of 300kOhm@1kHz display the capability to record both single and multi unit activity and seem to be able to map a small volume in the brain with high density. A novel spike detection operator and further improvements towards a multi-multi-unit array are suggested.