The voice is made even more convincing because it has been programmed to include verbal tics such as "ums", "ers" and sighs. Computer experts at IBM have invented the technology to be used on telephone helplines, satellite navigation systems and even on cameras or iPods. It is so sophisticated that the devices will be able to pause for effect or cough to attract the users' attention, spelling an end to the irritating monotone voices that have become a part of everyday modern life. Andy Aaron, of IBM's Thomas J Watson research group speech team, said: "These sounds can be incredibly subtle, even unnoticeable, but have a profound psychological effect. It can be extremely reassuring to have a more attentive-sounding voice. "When you are on the telephone on an automated service helping you fix your computer or buy insurance, this could make the difference between being a happy customer or hanging up and cancelling a service." The new technology, c