"A model VDT experiment simplifying actual HCI situation at MMI, was conducted, where two subjects participated in experiment to solve the same cognitive task in competition. The experimental parameters were (i) different kinds of cognitive task, and (ii) cycle time of information display, to see the MWL influence on various biocybernetic signals. A special procssing unit for eye camera was developed and used for measuring subjects' eye movement characteristics. Regarding analysis, total information needed for problem solving was taken as anchoring measure for MWL, and the applicability of biocybernetic method for MWL estimation was evaluated from two aspects : (i) efficiency of visual information acquisition, and (ii) difficulty of inner cognitive process to solve problem, both in time pressure situation. It resulted in that eye movement were correlated to (i) , while heart rate, (ii) ."

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