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Modern research refutes the age - former myth that the loss of one signified may sharpen other gage . A new study from the University of Montreal found that unsighted hoi polloi have no cutting sense of smell than the sighted . visual modality red just make blind people pay more tending to how they comprehend olfactory modality , the researchers say .
" If you enroll a room in which chocolate is brewing , you will cursorily look for the chocolate simple machine . The blind someone entering the same room will only have the smell of coffee as selective information , " said graduate reseacher Mathilde Beaulieu - Lefebvre . " That smell will therefore become very important for their spatial internal representation . "
The study require 25 subjects , 11 of whom had been blind since birth . participant answered a questionnaire and then participated in two experiments . In the first , they tire to discern between 16 dissimilar perfume . In the second , they lay in a machine forebode a tomodensitometer and adjudicate to identify three scent : a rose , vanilla and butanol ( a sweet-smelling alcoholic drink ) .
" There is an urban legend that unreasoning masses have good aroma than the sighted . We are proving this to be fictive , " say Maurice Ptito , a professor at the University of Montreal and Beaulieu - Lefebvre ’s dissertation theater director . " However , the blind do set themselves aside when it comes to cognitive movement . "
Using functional mental imagery , the researchers mold that the blind use a region ofthe braincalled the secondary olfactory cortex more than the sighted when they smell . They also use the occipital lens cortex , which is normally usedfor imaginativeness .
" That ’s interesting because it mean the blind are recuperate that part of their nous , " said Ptito . " We ’re not address of recycling per se , yet that part of the mentality is reorganize and used otherwise . "
The loss of visual modality may affect each of the other senses differently . A 1998 Vanderbilt University subject found that child with visual disabilities were somewhat better than sighted children at determining what focus a sound was coming from .
The enquiry on thesense of smellcould take to concrete lotion that may facilitate blind citizenry pilot in their surroundings .
" For example , smells are very peculiar in shopping centers , " said Beaulieu - Lefebvre . " A hair salon , a pharmacy and a clothing storage each have their own distinctive scent . We could well foresee developing re - version curriculum for getting around in such home . "
