Control-signal input device for computer game machines

A control-signal input device for computer game machines for inputting control signals to a computer game machine constructed so that peculiar operations are performed in accordance with a plurality of game control signals, comprising

• means for extracting biological signals,
• means for obtaining signal components of each of a plurality of frequency components in said extracted biological signals, and obtaining the state of said biological signals by performing a predetermined computational processing for said signal components, and
• means for supplying control signals that substitute for said game control signals in accordance with the state of said obtained biological signals;
• said biological signals are brain waves, and the state of biological signals is obtained based on the ratio of the intensity of alpha-rhythm signal components, beta-rhythm signal components, or theta-rhythm signal components to the intensity of the entire signal components of each of a plurality of obtained frequency components.