Novel sensations in the congenitally blind

Article Abstract:

Blind people show a significant increase in regional cerebral blood flow in both the hemispheres of the brain when exposed to tactual stimuli. Analysis of the processing of tactual inputs by the primary visual cortex of the brain in congenitally blind humans shows that their neural mechanism is compensatory in nature. This leads to more hearing and touch sensation. The cortical mechanisms help in tactual activation. The convergence of the bilateral somatosensory inputs with visual inputs occurs in the superior temporal region of the brain.

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A new brain region for coordinating speech articulation

Article Abstract:

A discrete region of the left precentral gyrus of the insula may control the articulatory movements in speech. The insula is a cortical area lying beneath the temporal and the frontal lobes. Patients with a condition known as apraxia of speech, involving articulatory errors in producing the correct sound of words have lesions in this specific area. The findings are important for models focussing on cerebral localization which aim to localize language functions and other cognitive areas.

Brain, Localization (Brain function), Speech disorders, Apraxia

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Improved auditory spatial tuning in blind humans

Article Abstract:

Blind people have localization abilities that are better than those of sighted controls. However, this only occurs when listening to sounds in peripheral auditory space. The increased ability in blind people for sound localization in peripheral space seems to be at least partly mediated by an attentional tuning mechanism operating within the first 100 ms after sound onset. There is strong evidence for a reorganization of the neural substrates for early auditory selection.

Auditory perception

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