IMPLANTATION OF AN EEG TELEMETRIC TRANSMITTER IN THE RAT

We describe a method of implanting a telemetric transmitter of EEG sig nals in the laboratory rat. The transmitter is available commercially and may be implanted in a subcutaneous pocket prepared in the hindermo st dorsal region of rite animal. The two stainless steel electrodes co nnected to the transmitter are led to the cranium through a subcutaneo us tunnel, and are fixed to the cranium bones. EEG signals are collect ed by a receiver placed under the cage; reception of the signals is im proved by suitably, placed antennae. The method allows recording of EE G data from a free-moving mt during the expression of behavioral tasks in a limited space.