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Background and aim: Various studies indicate that background noise affects speech recognition ability of bilingual listeners (BL) more than monolingual ones (ML). However, no study has engaged in the speech recognition performance of Turkish-Persian bilinguals in the background noise. The purpose of the present study was to compare word recognition scores (WRSs) in the continuous and interrupted noises among ML Persian and BL Turkish-Persian young adults. 

Material and methods: The cross- sectional analytical study was conducted by presenting speech stimuli in quiet and in the background continuous and interrupted noises at signal to noise ratios (SNRs) of -20, -10, 0, +10 dB. Two groups of 33 ML Persian and 36 BL Turkish- Persian subjects with age ranging from eighteen to twenty-five years old participated   

Results: The degree of reduction in WRSs was significantly higher in the continuous noise relative to the interrupted one at four studied SNRs (p<0.0001) Moreover, the difference between WRSs of ML Persian and BL Turkish-Persian groups in the presence of both continuous (p≤0.001) and interrupted (p=0.002) noises was significant.

Conclusion: It seems that Persian-words recognition ability of Turkish-Persian BLs reduces more than Persian MLs in the background noises and continuous noise affects speech perception ability more than interrupted one. 

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Background and aim: Various studies indicate that background noise affects speech recognition ability of bilingual listeners (BL) more than monolingual ones (ML). However, no study has engaged in the speech recognition performance of Turkish-Persian bilinguals in the background noise. The purpose of the present study was to compare word recognition scores (WRSs) in the continuous and interrupted noises among ML Persian and BL Turkish-Persian young adults.

Material and methods: The cross- sectional analytical study was conducted by presenting speech stimuli in quiet and in the background continuous and interrupted noises at signal to noise ratios (SNRs) of -20, -10, 0, +10 dB. Two groups of 33 ML Persian and 36 BL Turkish- Persian subjects with age ranging from eighteen to twenty-five years old participated   

 Results: The degree of reduction in WRSs was significantly higher in the continuous noise relative to the interrupted one at four studied SNRs (p<0.0001) Moreover, the difference between WRSs of ML Persian and BL Turkish-Persian groups in the presence of both continuous (p≤0.001) and interrupted (p=0.002) noises was significant.

Conclusion: It seems that Persian-words recognition ability of Turkish-Persian BLs reduces more than Persian MLs in the background noises and continuous noise affects speech perception ability more than interrupted one. 

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Background and Aim: In order to compare word definition skill between bilingual and monolingual SLI (specific language impairment), we can investigate characteristics of these children and limited processing capacity (LPC) hypothesis about SLI.

Materials and Methods: Six (7-8 years old) bilingual (Azeri- Persian) children with specific language impairment were evaluated about their word definition and then compared with 12 normal children. Impaired children were diagnosed as exhibiting a significant delay (more than one year) in language that cannot be explained by intelligence deficits, hearing loss or visual impairment. We used specific language impairment and language development tests for diagnosis and Man Whitney and Wilcox tests for analyzing data.

Result:  There is no meaningful difference between bilingual and monolingual children with SLI (p=0.394) (p=0.394).There is meaningful difference in structural aspect of definition skills (p=0.02) between Persian and Azeri language of bilingual children but in content aspect there is not significant difference (p=0.17).

Conclusion:  Findings showed that there is no meaningful difference in comparison between Bilingual and monolingual children with SLI. Therefore, LPC hypothesis about SLI is rejected.

 Keyword: Specific language impairment, Bilingualism, Monolingual, Word definition skill.