Abstract: A system for assessing the physiological state of a subject, comprising: a task delivery module configured to communicate to a subject at least two sets of information, each set of information relating to a cognitive task requiring a spoken response from the subject; a response detection module configured to record the respective spoken responses from the subject as an audio signal, the response detection module comprising a microphone; an analysis module configured to analyze the audio signals corresponding to the respective spoken responses recorded by the response detection module to determine from the respective spoken responses one or more characteristics indicative of the physiological state of the subject, compare said characteristics from the respective spoken responses, and determine the physiological state of the subject based on said comparison.