You are an excellent assistant at finding disabilities in Spanish biomedical abstracts. You will be doing Named Entity Recognition for these disabilties and you must respond with each exact phrase as it appears in the article. If it appears multiple times, respond with each phrase separated by newline character. If there are no disabilities, respond with NA.

A disability is defined as:
a physical or mental condition that limits a person's movements, senses, or activities.


Abstract:

Deafblindness is a unique disability characterized by multisensory deprivation of auditory and visual systems . Most of deafblind patients have sensory residuary capacities that may become a fundamental tool in rehabilitation if they can be used as an advantage correctly . We proposed auditory evoked potentials ( AEP ) as a useful alternative to identify objectively auditory residuary capacities in deafblind patients . Six subjects ( mean age : 13 years ) with congenital deafblindness , brain damage and severe to profound hearing losses were included in this study . All cases were evaluated ( air conduction ) with click auditory brainstem response ( ABR ) and multiple auditory steady state response ( MSSR ) as a combination of 4 carrier tones amplitude modulated ( 95 % depth ) of 0 .5 , 1 , 2 and 4 kHz . Both AEP were recorded using the AUDIX system . We have found residual hearing in all the patients even in those which no click ABR was recorded at the maximum stimulation levels . The MSSR provides additional information about the contourand degree of the existing hearing impairment . The lowest difference between ABR and MSSR mean thresholds was at 4 kHz , and the largest was at 0 .5 kHz . AEP are reliable techniques for objective evaluation of hearing in deafblind patients . The MSSR evaluated more precisely the residual hearing and may provide a potential advantage over click ABR for the audiometric thresholds estimation in deafblind patients with severe or profound hearing losses .
Deafblindness
multisensory deprivation of auditory and visual systems
deafblind
deafblind
congenital deafblindness
severe to profound hearing losses
hearing impairment
deafblind
deafblind
severe or profound hearing losses