Objectives: Deaf and hard-of-hearing children are slow in language development, and language deficits are common in hearing-impaired children. Here, all areas of the language, including syntax, morphology, phonology, semantic and pragmatic, are involved, and this leads to a deficiency in reading and academic skills. Evidence shows that through early intervention, we can minimize or eliminate problems of children with hearing loss. Early intervention teaches parents how to communicate with their disabled child.
Methods:Internet search in databases including ISI Web of Knowledge, Embase and Pubmed from 1990 to 2014 was conducted. Key words such as children with hearing loss, deaf children, hard-of-hearing, family education program(s), early intervention, early detection, family's approach, parent's approach, and parent's education program(s) were searched.
Results:A total of 100 articles were initially found, and only 20 articles were finally selected for the study. The inclusion criteria for the study were as follows: the article should be interventional and written in English and should be published between 1990 and 2014.
Discussion:Research showed the effectiveness of early intervention in the early development of language and vocabulary. In addition, early detection of hearing loss in the first 6 months of age has a positive impact on children and families interactions and consequently, on language and vocabulary development. The primary focus in the implementation of early intervention services is to reduce the negative effects of risk factors and facilitate optimum development over time. Finally, the combination of early diagnosis and early intervention for children with hearing impairment is necessary.
Much is known about the role of cortical areas in language processing. The shift towards network approaches in recent years has highlighted the importance of uncovering the role of white matter in connecting these areas. However, despite a large body of research, many of these tracts’ functions are not well-understood. We present a comprehensive review of the empirical evidence on the role of eight major tracts that are hypothesized to be involved in language processing (inferior longitudinal fasciculus, inferior fronto-occipital fasciculus, uncinate fasciculus, extreme capsule, middle longitudinal fasciculus, superior longitudinal fasciculus, arcuate fasciculus, and frontal aslant tract). For each tract, we hypothesize its role based on the function of the cortical regions it connects. We then evaluate these hypotheses with data from three sources: studies in neurotypical individuals, neuropsychological data, and intraoperative stimulation studies. Finally, we summarize the conclusions supported by the data and highlight the areas needing further investigation.
Much is known about the role of various cortical areas in language production and comprehension. The shift towards network approaches in recent years has highlighted the importance of uncovering the role of the white matter in connecting these areas. However, despite a relatively large body of research, the function of many of these tracts is still underdefined. In this paper, we present a comprehensive review of the empirical evidence on the role of eight major tracts that are hypothesized to be involved in language processing (inferior longitudinal fasciculus, inferior fronto-occipital fasciculus, uncinate fasciculus, the extreme capsule, middle longitudinal fasciculus, superior longitudinal fasciculus, arcuate fasciculus and frontal aslant tract). For each tract, we hypothesize the tract’s role based on the function of the cortical regions it connects. We then evaluate these hypotheses in light of data from three sources: studies in neurotypical individuals, neuropsychological data, and intraoperative stimulation studies. Finally, we summarize the conclusions supported by the data and highlight the areas in need of further investigation.
As neuroscience literature suggests, extreme capsule is considered a whiter matter tract. Nevertheless, it is not clear whether extreme capsule itself is an association fiber pathway or only a bottleneck for other association fibers to pass. Via our review, investigating anatomical position, connectivity and cognitive role of the bundles in extreme capsule, and by analyzing data from the dissection, it can be argued that extreme capsule is probably a bottleneck for the passage of uncinated fasciculus (UF) and inferior fronto-occipital fasciculus (IFOF), and these fasciculi are responsible for the respective roles in language processing.
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