1. A compensatory modulator for use with a display controller included in a system to adaptively mitigate motion sickness of an operator in a task, the compensatory modulator comprising: one or more inputs to receive at least one of physiological measurements of the operator or operator activity behavior from one or more monitoring devices; and a cognitive state expert system configured to (a) determine whether the operator is experiencing motion sickness by determining a cognitive state of the operator based on the received inputs, (b) compute mitigating display parameters based on the determined state of the operator to mitigate determined motion sickness for that operator, and (c) output the computed mitigating display parameters to the display controller.