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According to this theoretical framework, the time constants for the rate of change of current should be unique functions of the membrane potential, and should be independent of the previous history of the voltage and current flowing. In recent years, however, there has been increasing awareness of the fact that, for many physiological preparations, the space just outside the cell membrane is not in good diffusive contact with the<jats:italic>bulk<\/jats:italic>extra-cellular fluid perfusing the preparation. 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