Paper Information

Title: 

THE EFFECT OF BEHAVIORAL RELEVANCE ON AUDITORY COGNITION

Type: PAPER
Author(s): HEIDARI FATEME*,FARAHANI S.,MOHAMMADKHANI GH.,JAFARZADEHPOUR E.
 
 *
 
Name of Seminar: INTERNATIONAL CONNGRESS OF IRANIAN SOCIETY OF OTOLARYNGYOLOGY / HEAD AND NECK SURGERY
Type of Seminar:  CONGRESS
Sponsor: 
Date:  2010Volume 1
 
 
Abstract: 

BACKGROUND AND AIM: FOLLOWING AN EARLY VISUAL DEPRIVATION, THE NEURAL NETWORK INVOLVED IN PROCESSING AUDITORY INFORMATION UNDERGOES A PROFOUND REORGANIZATION, BECAUSE BLIND INDIVIDUALS ARE FORCED BY THE NATURE OF THEIR DISABILITY TO DEPEND ON NON-VISUAL MODALITIES, INCLUDING AUDITION, FOR INFORMATION ABOUT THEIR EXTERNAL ENVIRONMENT. IN ORDER TO INVESTIGATE THIS PROCESS, EVENT-RELATED POTENTIALS PROVIDE ACCURATE INFORMATION ABOUT THE TIME COURSE NEURAL ACTIVATION ACCOMPANYING THE PERCEPTION AND COGNITIVE PROCESS. IN THIS STUDY, THE LATENCY AND AMPLITUDE OF AUDITORY EVENT-RELATED POTENTIALS (P1, N1, P2, N2 AND P3) WERE COMPARED IN SIGHTED AND EARLY BLIND INDIVIDUALS IN THE AGE RANGE OF 18-25 YEARS OLD. MATERIALS AND METHODS: IN THIS CROSS-SECTIONAL STUDY, AUDITORY EVENT-RELATED POTENTIALS WERE MEASURED IN CONVENTIONAL ODDBALL PARADIGMS BY USING TWO TONE BURST STIMULI (1000 & 2000 HZ) ON 20 SIGHTED SUBJECTS WITH A MEAN AGE OF 20.65 YEARS OLD AND 19 EARLY BLIND SUBJECTS WITH A MEAN AGE OF 20.94 YEARS OLD. THE FINDINGS WERE ANALYZED WITH THE MANN-WHITNEY NONPARAMETRIC TEST AND THE SPSS 11.5 SOFTWARE.
RESULTS: THE MEAN LATENCY OF P2 AND P3 WAVES IN EARLY BLIND SUBJECTS WAS SIGNIFICANTLY SMALLER THAN THAT OF SIGHTED SUBJECTS (P<0.05). MOREOVER, MEAN AMPLITUDE P2 AND N2 WAVES IN BLIND INDIVIDUALS WERE SIGNIFICANTLY BIGGER (P<0.05).
CONCLUSION: THE PLASTICITY CHANGES IN THE EARLY BLIND INDIVIDUALS ENHANCE THE SPEED OF NEURAL CONDUCTION, AUDITORY PROCESSING AND ATTENTION. IT PROBABLY INDICATES THE HIGHER LEVEL CORTICAL FUNCTION BECAUSE OF SENSORY COMPENSATION.

 
Keyword(s): AUDITORY EVENT-RELATED POTENTIALS, EARLY BLINDNESS, ATTENTION
 
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