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Research Proposal: Dichotic Listening Paradigm

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RESEARCH PROPOSAL

Dichotic Listening Paradigm using ALLR:
An Exploratory study

INTRODUCTION
There are many different methods to study brain asymmetry such as Wada test, tachistoscopic test and brain imaging. Dichotic listening is one among them. The concept ‘dichotic’ listening was introduced by Trimble (1931), the classic Dichotic Listening (DL) test was proposed by Broadbent (1954) and later linked to hemisphere-specific functions by Kimura (1961).This test is a simple, behavioural, non-invasive procedure which indicates overall hemispheric dominance effects (Ahonniska, Cantell, Tolvanen, & Lyytinen, 1993; Kimura, 1961) The use of DL has been widely accepted to infer brain asymmetry, since it is sensitive to hemisphere differences …show more content…

This study is a prospective observational study were 8 participants with their age ranging from 19 – 24 were recruited. A duly calibrated (ANSI S3.43-1996) double channel diagnostic audiometer (Madsen Astera) coupled with TDH-50P earphones were used to obtain air conduction thresholds, bone conduction thresholds were obtained using Radio ear B-71 bone vibrator. A calibrated (ANSI 3-39-1987) immittance meter (GSI Tympstar) were used to assess the middle ear status of the client prior to the actual study. Brainstem response and CEAPs will be recorded using Compumedic’s NeuroscanSystemsTM (32channels) (Neuroscan 4.5). Stimulus recording and presentation would be done using STIMTM software.
Dichotic syllables (/pa/ – voiceless, bilabial, stop, /ta/ - voiceless, alveolar, stop) were used as stimulus for obtaining CEAP’s..Stimulus was presented using ‘SOUND’ module of Stim 2 software. Stimulus was presented through insert ear phone with the intensity of 70dBSPL . ‘Acquire’ module of NeuroScan system with SynAmps2 amplifier was used to record CEAPs.All the measurements were carried out in an acoustically treated room with permissible noise levels as recommended by ANSI

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