Complex sentence: Brain fingerprinting is fundamentally different from the polygraph test, which measures emotion-based physiological signals such as heart rate, perspiration, and blood pressure, because it does not attempt to determine whether or not the subject is lying or telling the truth.
Split into simpler sentences: Brain fingerprinting is fundamentally different from the polygraph test, which measures emotion-based physiological signals such as heart rate, perspiration, and blood pressure. Unlike polygraph testing, it does not attempt to determine whether or not the subject is lying or telling the truth.