I thought this may be of interest How the blind can use sonar to 'see' like a bat Daily Telegraph 21 May 2013 BLIND and visually impaired people can locate objects by listening to echoes, just as bats and dolphins do, scientists have discovered. The built-in sonar may also help them with finding their way and with general spatial awareness. Researchers at Southampton University devised experiments with both sighted and blind people in a chamber where other sounds, such as the footsteps of people placing the objects, were eliminated. They found that blind people were able roughly to find objects from noises bouncing off their surface, while sighted people with good hearing showed potential to do so with practice. They tried sounds of different pitches and durations and discovered that some worked better than others and that it was more dif-ficult when the person was not facing the item, or it was further away. Dr Daniel Rowan, the lead author, said: "Some people were better than others but being blind doesn't automatically confer good echolocation ability. Ability probably gets even better with extensive experience and feedback." The researchers hope to develop training programmes and devices to help the blind as well as sighted people in situations where their vision is reduced. The study was published in the journal Hearing Research. ** To leave the list, click on the immediately-following link:- ** [mailto:access-uk-request@xxxxxxxxxxxxx?subject=unsubscribe] ** If this link doesn't work then send a message to: ** access-uk-request@xxxxxxxxxxxxx ** and in the Subject line type ** unsubscribe ** For other list commands such as vacation mode, click on the ** immediately-following link:- ** [mailto:access-uk-request@xxxxxxxxxxxxx?subject=faq] ** or send a message, to ** access-uk-request@xxxxxxxxxxxxx with the Subject:- faq