By John K. Niparko MD

Thoroughly up-to-date for its moment version, this publication offers an in-depth dialogue on prosthetic recovery of listening to through implantation. The textual content succinctly discusses the medical rules in the back of cochlear implants, examines the newest know-how, and gives sensible suggestion on the right way to verify applicants, how one can implant the units, and what rehabilitation is most appropriate. The authors completely research the results of cochlear implantation, the effect at the patient's caliber of lifestyles, the advantages when it comes to the prices, and the results of cochlear implants for language and speech acquisition and early life education.

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Extra resources for Cochlear Implants: Principles and Practices

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For example, blind subjects are often considered to have hearing that is better than normal. 54 The authors found that early-blind people were better at monaurally localization of sound sources than were normalsighted subjects. The ability to localize sounds in space with one ear relies on spectral cues created by interference patterns created by the canal and the folds of the external ear. One must learn to use these pinna spectral cues to locate sounds with one ear. When binaural timing cues are not available, such as when the sound originates directly overhead or behind the head, pinna spectral cues are also useful for localization.

It is almost as if the mechanisms of plasticity, present at birth, are restrained in the adult. Will we be able to discover these underlying mechanisms in the immature brain and use them to increase plasticity in adults? Given the above evidence for adult plasticity, the question of an age-related effect still remains: Why should a younger brain have greater plasticity than an older brain? qxd 1/8/09 10:56 AM Page 31 Chapter 2 ■ Brain Plasticity: The Impact of the Environment On the Brain As It Relates to Hearing and Deafness 100 Pre-training 31 Cortex Pre BF Conditioned frequency % Max.

If peripheral structures are damaged during the critical period, the brain fails to form normally, and subsequent modifications in peripheral structures will not ameliorate the changes in the central nervous system. In the case of barrel cortex, the organizational loss is clearly obvious and the impact on cortical processing is expected to be profound. The very matrix by which individual vibrissae maintain segregated information channels is lost. LESIONS NORMAL COMPETITION AND THE PLURIPOTENT CORTEX medial post ant lateral Figure 2-4 ■ The effects of vibrissae (“whiskers”) damage on the devel- opment of barrels, the cortical structures that receive input from each individual vibrissa.

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