A system for measuring human perception at edges of awareness includes a message transmitter providing embedded pre-semantic messages having a predetermined meaning or a predetermined object representation for visual priming, the messages being embedded within supraliminal information and a sensory monitor for measuring reaction in an individual to the predetermined meaning or predetermined object representation of the embedded pre-semantic messages. A control system receives an input from the sensory monitor, the control system including a real-time feedback control loop altering a perceptibility of the embedded messages with respect to the supraliminal messages as a function of the sensory monitor input.