Calculation of the target point by means of an analogue tracer.
D001921:Brain / Q000502:physiology*; D001931:Brain Mapping; D002552:Cerebral Ventricles / Q000033:anatomy & histology; D003201:Computers; D004594:Electrophysiology; D006801:Humans; D008433:Mathematics; D013238:Stereotaxic Techniques