Cognitive representations in the brain: Evidences from semantics tasks

Nair, Remya. P. and Bhat, Jayashree S. (2011) Cognitive representations in the brain: Evidences from semantics tasks. IPEDR, 26. pp. 10-14.

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Cognitive processes relies on language skills and one component of language is semantics and semantics is thought to be the knowledge about the universe and thought to be represented in tempero-parietal areas in brain and damage to this area results in semantics deficits exhibited in form of naming deficits.In recent years, case studies of brain-injured patients have demonstrated selective impairments in naming objects in specific categories and through specific modalities. Although many studies have provided evidences of category specific and modality specific naming impairments, such deficits are rarely reported in our clinical settings. The paper attempts to highlight a case who did not reveal any apparent deficits in linguistic skills when examined with Western Aphasia Battery (WAB) except minor difficulties in naming visually presented objects. The errors seen in the present patient is in visual perceptual level and in semantic processing level, and the errors are not homogenous. Visuo-verbal disconnection can be a type of modality specific naming impairment which is seen in the present patient. It was proposed that the inability to name the visually presented objects reflects a disconnection between the right hemisphere’s semantic system which supports performance of nonverbal semantic tasks and the left hemisphere system which is required for naming. So the visual semantics and the verbal semantics can be thought as partially specialized sub regions within a general frame work. As these subjects have intact ability to name through other modalities, it is important to identify them by assessing their ability to gesture the visually presented object. The scientific literature is rich of various types of dissociations of linguistic knowledge such as category specific and modality specific impairments. Furthermore, within the category specific impairments, researchers have identified various dichotomies, affecting certain types of categories and sparing the rest. There are many studies which discuss about the existence of modality specific and the category specific impairment in naming. The existence of category specific and modality specific naming deficits leads to the assumption that there is a multiple cognitive representation in the brain and the assumption of unitary semantics in brain need to be questioned.

Item Type: Article
Uncontrolled Keywords: cognition, category specific naming defict, unitary semantic system, visual semantics, verbal semantics
Subjects: Allied Health > Mangalore Campus > Speech and Hearing
Depositing User: KMCMLR User
Date Deposited: 21 Jan 2013 06:21
Last Modified: 21 Jan 2013 06:21

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