London: In ray of hope for the blind, a research has found that visually challenged people can develop "sonar", that is, learning to navigate like bats by "seeing" objects from sounds reflected off them.
The men later had these sounds played back to them, while their brain activity was monitored using functional magnetic resonance imaging (fMRI) scans. During playback, they were able to identify which object was which from the echoes. The fMRI scans showed that these echoes were being processed by brain regions normally used to process visual information; no echo-related activity was seen in the auditory brain areas, which would be expected to process sound, `The Daily Telegraph` reported. PTI
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