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Is one sense's loss another's gain?

In this extract from the 2006 Optician/City University Prize-winning dissertation, Rekha Chopra reviews the evidence for whether a blind person may hear better as a result of their sight loss

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Pitch discrimination

The visual cortex was shown to have possible involvement in response to pitch changes1 as occipital regions were found to be activated in pitch discrimination in both early and late-onset blind subjects through ERP studies.2 Behavioural data provided evidence that blind subjects were found to be better at discriminating pitch change than sighted subjects. However, the early blind subjects were found to perform better than late-onset blind subjects in discriminating the change in pitch of a pair of pure tones with decreased tone durations and decreased spectral differences. A significant negative correlation was determined between increased age of onset and correct pitch discrimination.3

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