The corpus callosum is a group of nerve fibers that connect both sides of the brain and allow them to communicate. In the current article we are aimed at discussing the special functions of each hemisphere and the role that corpus callosum plays in many cognitive functions that will led in the interaction of the operations of the hemispheres. Corpus callosectomy can affects hearing abilities and other communicative functions.

We aimed at discussing some common auditory disorders in children with dyslexia. In such patients delayed reading, memory dysfunction, spatial and visual perception and hearing abnormalities are reported with various degrees.Investigations have not led to distinct findings about the etiology of the abnormality. We will discuss this abnormality with an audiological point of view.

Nowadays OAE have a special role in electrophysiological examinations and also remarkable application in infants&apos hearing screening test. In the current article we have focused attention on the physiological fundamentals of OAE and tried to explain the trends in physiological studies that finally led to discovering the acoustic radiations by "David Kemp". By studying this article we can conclude that inner ear cannot be pondered just as a transformer that change the movements of the inner ear&aposs fluid to the neural signal, rather it should be considered as an active organ that can produce energy and also control the other active mechanisms involved in hearing.

Prescription of hearing aid is an extensive special category of knowledge in the field of audiology. This article is aimed at discussing the function of hearing aid and also management of patients in the noisy environments and presenting solutions to overcome problems regarding to this issue along with taking a look to the equipments prepared nowadays to cope with noisy situations.

Binaural hearing is an important phenomenon in hearing for human being. Nowadays, the role of binaural hearing in the process of amplification has been focused. Since hearing aids act separately in the process of amplification and hearing, the attentions has been devoted to designing a system for binaural amplification by means of Beam forming which will be explained in more details in the current article.

Objective: Genetic studies show that consanguineous marriage can increase the probability of incidence of genetic impairments such as hearing impairments. The target of this study is to identify the prevalence of consanguinity among the parents of hearing impaired students in primary schools.

Materials and Methods: We selected all of deaf students of Tehran (614 students). Their mothers answered to questionnaires. The questions were about Risk Factors of deafness in mother pregnancy or in neonatal period.
Results: from 614 students, 389 parents of them (64%) had consanguineous marriage and 223 person (36%) didn&apost have this factor. 2 person did not answer to this question. In this study we observed that there is 32.3% family history of hearing loss, 29.2%deaf sister and brother, 17% ear infection history. Other risk factors were studied too. Also there is significant correlation between consanguinity and more than one deaf children in the family (p<0.005).
Conclusion: According to high incidence of consanguinity (64%)that was observed in this study it may be one of most important causes of sensory neural hearing loss in children, so we should give enough information about this problem to the people.