Comparison of auditory middle latency responses in Azari -Persian bilinguals and Persian monolingual

Bilingual individuals are compelled to control the interference of two languages toperevent the unintended use of the non-target language. It has been shown that in the subcortical level، basal ganglion and the thalamus are involved in controlling the two languages in bilinguals. As the auditory middle latency responses (AMLRs) investigate the thalamocortical routes، this study aimed to compare the AMLRs in early Azeri- Persian bilinguals with Persian monolinguals. This cross sectional descriptiveanalytic and non-intervention study

In this cross-sectional study AMLRs were conducted on 37 early Azari-Persian bilinguals with mean age of 21. 77 and 37 Persian monolingual controls with mean age of 22. 02in two genders. The AMLR test was recorded in two groups،with click stimulus. amplitudes and latencies of the waves compared in twogroups. also،the correlation of the azari language’s application examined with AMLRscomponents in the azari_persian bilinguals.

The average of the Na-Pa amplitude in the Azeri- Persian bilinguals were statistically larger than the Persianmonolinguals just in the right ear (P=0. 04). but this significant different in the Pa-Nb observed in the right (P=0. 01) and left (P=0. 03) ear. There was correlation between usage of Azeri language and Na-Pa (p=0. 01) (r=0. 427) andPa-Nb (p=0. 04) (r=0/348) in the bilinguals.

It appears that auditory middle latency responses in the adults have high stability. in the study the bilinguals that have high level of proficiency in two languages and use the two languagescurrently،have larger amplitude in comparison to monolinguals. so،the bilingualism should be consider in the explanation of the AMLRs results.