Abstract: Structural systems and method are employed including a multiplicity of computers to control the acquisition and enhancement of skilled performance or behavior. Preprocessing computers (8 and 24) each accept signals from any corresponding one of a variety of physiological or other signal transducers either in close proximity to the computer or transmitted to the computer via a telemetering system. The preprocessing computer calculates a number of different measures of this signal and makes the results known to one or more other computers. These other or auxiliary computers control presentation of a display of the data for a human observer, and perform additional calculations which determine if the processed data is within a predetermined range. This range may be a function of time and/or other variables. A measure of the error between the allowed range and the processed data is computed within these auxiliary computers. These results may be used to alter the display.