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Some blind people are able to use the strait of echoes to " see " where things are and to sail their environment . Now , a unexampled field find that these people may even be using visual parts of their mind to process the sound .
Echolocation is well know in at-bat , whosend out high - pitch soundsand then use the echoes to tag their target in the dark . But a select few blind people use echolocation as well , make clicking sound with their tongues to tell them where obstacles are . The young study , published May 25 in the candid - access diary PLoS ONE , is the first to peer into the brain of unreasoning people who are doing just that .
A skill normally associated with bats can help some blind people get around.
The study discover that in two blind men who can echolocate , psyche region unremarkably associated with visual modality set off when they listen to recording of themselves echolocating .
" Our data clearly show that EB and LB [ the report participants ] use echolocation in a way that seems uncannily similar to vision , " wrote the report authors . " In this means , our study point that echo sounding can provide unsighted people with a high level of independence and self - reliance . "
To analyse EB and LB ’s echolocation ability , the researchers record theirclicks and echoesas they sit near an object ( in this case , a screen ) . The researchers then play those clicks and echoes back as the men lay in a functional magnetised reverberance mental imagery ( fMRI ) machine . The fMRI measure rake stream to dissimilar field of the brain , providing a real - time flavor at brain activity .
The researchers found that as the men listened to the echoes , the primary optical area of their mental capacity , do it as the calcarine cerebral mantle , became more dynamic . When the researchers played sounds with echoes and sounds without echoes , they found that the blind valet de chambre ’s calcarine cortex responded based on the presence of echoes , while the audile cerebral mantle , used to process sounds , did not respond otherwise either fashion .
The same run performed on two sighted men without echolocation power turn up no such calcarine pallium bodily function .
Blind people often showreorganized mastermind processingcompared with their sighted counterpart , so more enquiry is needed on larger groups of hoi polloi to twit out exactly what ’s going on in the nous , the researchers wrote . Ideally , researchers may be able to equate not just blind echolocaters and sighted non - echolocaters , but also blind people who do n’t echolocate and sighted people who do .
According to bailiwick research worker Stephen Arnott of the Rotman Research Institute in Toronto and his workfellow , the bailiwick is a first step in understanding how the brain serve an ability that ostensibly melds sound and visual sense .
" There is the possibility that even in sighted people who learn to echolocate , ocular brain areas might be recruited , " Arnott say in a statement .
