Imagine that you can hands-free to switch on iPods or phones, it may be in reality soon. Japanese researchers have developed head gear that uses infrared sensors and a microcomputer to let people operate music players by clenching their teeth. The computer receives a command when the user clenches his or her teeth for about one second — which differentiates the action from other activities such as chewing gum and talking. The research team at state-run Osaka University hopes to put the device to commercial use for music players and believes it can eventually be adapted to run cellphones, wheelchairs and other products.

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