A brake booster for use in a hydraulic braking system having a brake pedal, a master cylinder, and a hydraulic control unit includes a housing, a screw drive arrangement positioned at least partially in the housing, a motor coupled to the housing for actuating the screw drive arrangement, and a piston assembly positioned in the housing. An operator controls the motion of a movable reflective surface. Media device inputs may be set by the media device itself or by a computer attached to the media device, either directly or via a network. If different CP lengths are used in a legacy support mode of an evolved system, it is possible to solve a problem in detecting a control channel or a data channel, which may occur as the CP lengths are not distinguished from each other after preamble detection. Also disclosed are methods for identifying compositions which affect neuroblasts and for treating a subject with a neuronal disorder, and a culture system for the production and maintenance of neuroblasts.