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Auditory and proprioceptive spatial impairments in blind children and adults

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Developmental Science

Published online on

Abstract

It is not clear what role visual information plays in the development of space perception. It has previously been shown that in absence of vision, both the ability to judge orientation in the haptic modality and bisect intervals in the auditory modality are severely compromised (Gori, Sandini, Martinoli & Burr, 2010; Gori, Sandini, Martinoli & Burr, 2014). Here we report for the first time also a strong deficit in proprioceptive reproduction and audio distance evaluation in early blind children and adults. Interestingly, the deficit is not present in a small group of adults with acquired visual disability. Our results support the idea that in absence of vision the audio and proprioceptive spatial representations may be delayed or drastically weakened due to the lack of visual calibration over the auditory and haptic modalities during the critical period of development. There is a general consensus on the crucial role of visual experience in guiding the maturation of space cognition in the brain (Thinus‐Blanc & Gaunet, 1997). We tested congenitally blind children and adults in two spatial tasks (auditory distance discrimination and proprioceptive reproduction). We found a substantial spatial impairment in congenitally blind children and adults for auditory distance discrimination and proprioceptive reproduction, but we did not observe the same trend in a small group of late blind adults. The results support the idea that vision is crucial for the development of space perception and highlight the importance of cross‐sensory input for calibration of sensory systems during development.