..................................................................... KEYWORDS; BIOTELEMETRY ELECTROPHYSIOLOGY SENSORS MICRO-CIRCUITRY ABSTRACT; Biopotential recordings of human psycho- physiological parameters are hampered in many field settings, and some laboratory and clinic settings, by the sensor technology. [Eleanor White's comment: Take SPECIAL NOTE of that word "PSYCHO-"... that has great significance for neuro- electromagnetic experimentees!] Conventional electrodes which tether the subject to the signal amplification and recording equipment, are cumbersome to apply, often interfere with normal movements, are easily dislodged, and induce electrical noise due to the movement of the electrode wires carrying low level signals. This project seeks to design essentially wireless electrode recording systems that use radio frequency telemetry to transmit the biopotential signal from the recording site to a body-worn transceiver and then to a remotely located receiver. [Eleanor White's comment: That means, radio signals THROUGH THE FLESH to an externally worn transceiver. The only difference between this UNclassified project and the involuntary neuro-electromagnetic experimentees is distance, which can be overcome with time.] The present subcontractor has developed transceiver and receiver technology that will be reviewed and customized as needed for the present application. The focus here will be on developimg a generic design for the sensor subsystem ("telectrodes") to include the transducer interface with the skin, miniaturized amplifier and filter circuitry, an optimal connection between the transducers providing differential inputs to the amplifier, a longlasting but compact battery, and transmitter. Phase I will consist of a design specification, development of a bench-top engineering prototype, design trade-off studies using the prototype, and the delineation of a detail design. -128-