VIBRATION-INDUCED AUDITORY-CORTEX ACTIVATION IN A CONGENITALLY DEAF ADULT

Considerable changes take place in the number of cerebral neurons, syn apses and axons during development, mainly as a result of competition between different neural activities [1-4]. Studies using animals sugge st that when input from one sensory modality is deprived early in deve lopment, the affected neural structures have the potential to mediate functions for the remaining modalities [5-8]. We now show that similar potential exists in the human auditory system: vibrotactile stimuli, applied on the palm and fingers of a congenitally deaf adult, activate d his auditory cortices, The recorded magnetoencephalographic (MEG) si gnals also indicated that the auditory cortices were able to discrimin ate between the applied 180 Hz and 250 Hz vibration frequencies. Our f indings suggest that human cortical areas, normally subserving hearing , may process vibrotactile information in the congenitally deaf.