A diagnostic system for measuring and analyzing startle response of a subject comprises a stimuli delivery module, whereby startle stimuli and prepulse stimuli are delivered to subject; said diagnostic system comprises at least one sensor module, whereby the startle response of subject are detected and recorded; said sensor module comprises at least one electrode and one eyeblink response measuring means; and said diagnostic system comprises a diagnosis module whereby the features of the startle response and prepulse inhibition of subject are extracted and analyzed.