An inductive sensing system (8) is adapted to apply electromagnetic excitation signals into a body, the system comprising a resonator circuit (10) incorporating a loop antenna (12). The system senses signals returned back from the body with the same antenna, based on variation in electrical characteristics of the resonator circuit. The system is configured for separating signals received from different physiological sources within the body. This is performed based on detecting in the resonator circuit electrical characteristics indicative of both a real and an imaginary part of an additional inductance component added to the antenna by received electromagnetic signals. A reference dataset is consulted which stores, for different signals from different known physiological sources within the body, an indicator of characteristic exhibited relative magnitudes of real and imaginary inductance components added to a sensing antenna circuit. By consulting this dataset, and using the detected measures indicative of real and imaginary inductance components, one or more signal components from different known physiological sources are extracted from the received electromagnetic signals.
