| http://www.w3.org/ns/prov#value | - a) non-electrical cerebral global or regional signals, such as concentrations of glucose, free radicals, metabolic by-products, neuro-transmitters, or other substances, or measurements of intracranial pressure, temperature, blood flow or indices of metabolic activity, etc.; b) cardiovascular signals such as heart rate, R???R interval and variability, etc.; c) respiratory signals such as tidal volu
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