The deafness

Deafness is the difficulty or inability to use the sence of hearing. There are different types of hearing loss, for example conductive hearing loss caused by the obstruction of outer or middle iodine, and central hearing loss that affects the brain auditory centers.
The following texts dealing with these types of deafness:

1. Prevalence of hearing impairment in children at risk:

 http://www.scielo.br/scielo.php?pid=S1808-86942010000600012&script=sci_arttext&tlng=en

2. Temporal resolutions in children: comparing normal hearing, conductive hearing loss and auditory processing disorder:

http://www.scielo.br/scielo.php?pid=S0034-72992009000100020&script=sci_arttext&tlng=en


 Both texts dealing with deafness studies conducted in children.
 The first paper deal with a clinical and experimental study to compare the resolution brain among chlidren with normal hearing, with conductive hearing loss and auditory processing disorders. The conclusion was that indeed the conductive hearing loss and auditory processing disorder affects perception thresholds, for this reasons these children need auditory stimuli higher than normal charges for the most people.
The second paper deal with a descriptive study to determine the prevalence of hearing impairment in babies. The conclusion in this case was a high prevalence of hearing deficiences, for this reason is important to apply early audiological tests to babies, so we know the cases of deafness and can be treated, as descrbed pathologies affect intellectual and cognitive development of children, causing including problems in language development and personality.