This term has been used to describe the fact that data from stereotactic implanted electrodes are transmitted telemetrically from freely moving rats. It allows fingerprinting CNS drug effects into different categories (like stimulants, neuroleptics, analgesics ....) according to electrical brain activity. Processing of the raw data by Fast Fourier Transformation and separation of the data into specially defined frequency ranges (delta, theta, alpha and beta waves) provides information on time and dose related changes  induced by compounds acting on the central nervous system with respect to four brain areas and six frequency ranges. This approach provides 24 variables producing an electrical fingerprint as depicted below for some wellknown standard pharmaceuticals.

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