Abstract: The objective evaluation of a subject's interest in specific information, such as education and training materials, for example, is made possible by using patterns of physiological activity generated in the brain. Samples of individual brain activity are obtained to assess whether an individual is paying attention and showing interest in certain materials. Effectiveness in presenting such materials would be improved when direct brain recording activity shows increased interest in the presented material.

Abstract: A method and apparatus for controllably moving devices for cleaning or inspection through piping systems, including piping systems with numerous piping bends therein, by using hydrostatic pressure of a working fluid introduced into the piping system. The apparatus comprises a reservoir or other source for supplying the working fluid to the piping system, a launch tube for admitting the device into the launcher and a reversible, positive displacement pump for controlling the direction and flow rate of the working fluid. The device introduced into the piping system moves with the flow of the working fluid through the piping system. The launcher attaches to the valved ends of a piping system so that fluids in the piping system can recirculate in a closed loop.

Abstract: The invention provides an apparatus and method for identifying individuals based upon patterns of physiological activity generated in the brain and for distinguishing between normal and impaired brain states in any particular individual. These patterns may be obtained by directly or indirectly recording the electrical and/or magnetic activity associated with sensory, cognitive, and motor processing in the brain. This activity may be recorded using sensors placed in, on, or near the scalp. In this system, samples of individual brain activity are stored in an "intelligent" data base of a data acquisition/transformation stage which has the capability to learn to distinguish the individual characteristics of normal patterns of brain activity.