A material reduction apparatus for reducing materials having an admixture that resists reduction. Furthermore, the test system for circuits includes a plurality of PGAs each of which is connected to the control unit and generates a test pattern in response to control data sent from the control unit according to a program; and interface units which are associated with the plurality of PGAS, respectively, and are connected to the circuits to be tested. Four items of image data obtained based upon respective ones of the four areas are input to corresponding correction circuits, which apply a correction to prevent image disturbance at the area boundaries. Safety control means are provided to initiate the display of real-time pharmacokinetics data for the anesthetic agent only when a predetermined threshold value for the anesthetic agent is detected by the monitor.