LANGUAGE IN INDIA

Strength for Today and Bright Hope for Tomorrow

Volume 13:8 August 2013
ISSN 1930-2940

Managing Editor: M. S. Thirumalai, Ph.D.
Editors: B. Mallikarjun, Ph.D.
         Sam Mohanlal, Ph.D.
         B. A. Sharada, Ph.D.
         A. R. Fatihi, Ph.D.
         Lakhan Gusain, Ph.D.
         Jennifer Marie Bayer, Ph.D.
         S. M. Ravichandran, Ph.D.
         G. Baskaran, Ph.D.
         L. Ramamoorthy, Ph.D.
Assistant Managing Editor: Swarna Thirumalai, M.A.

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Processing of Frequent versus Infrequent Words in Neuro-typicals
and Persons with Broca’s Aphasia- ERP Study

Lagishetti Sampath Kumar, Ph.D. Candidate
Dr. S. P. Goswami, Ph.D. (Speech & Hearing)

Abstract

The frequencies of occurrence of words have been studied in neuro-typical and persons with brain damage using behavioral and electrophysiological measures. Present study investigated the reaction time and accuracy of responses using frequent and infrequent words in persons with Broca’s aphasia and their performances were compared with neuro-typical participants and also measured N400 component in neuro-typicals. Results showed an obvious difference in both the accuracy and reaction time for both frequent and infrequent words in persons with Broca’s aphasia and a clear difference between frequent and infrequent words for latency and amplitudes of N400 was observed.

Keywords - aphasia, semantic, neuro-typical, accuracy, ERP, reaction time

Damage to Human Brain

The brain is one of the largest and most complex organ in the human body. Most of the growth of brain comes from the cerebral cortex. Cortex has left and right sides which are broadly similar in shape. Some areas show more lateralization towards particular activity. Left hemisphere is dominant for language and right hemisphere plays a minor role. For other functions like spatiotemporal reasoning, abstract thinking right hemisphere plays a dominant role compared to left hemisphere. The human brain is vulnerable to different types of damage; most common are head injury, stroke, infections, tumours etc. It is also susceptible to different degenerative disorders (Mohr JP, Dennis Choi , James Gotta & Philip Wolf, 2004).

This is only the beginning part of the article. PLEASE CLICK HERE TO READ THE ENTIRE ARTICLE IN PRINTER-FRIENDLY VERSION.

Lagishetti Sampath Kumar, Ph.D. Candidate
Junior Research Fellow
Department of Speech Language Pathology
All India Institute of Speech and Hearing,
Mysore 570006
Karnataka
India
lagishettisk@gmail.com

Dr. S.P. Goswami, Ph.D. (Speech & Hearing)
Professor and Head
Department of Clinical Services
All India Institute of Speech and Hearing
Mysore 570006
Karnataka
India
goswami16@aiishmysore.in
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