Background and Aim: Caffeine consumes targeted attention to the signal, which is expected to lead to increased noise tolerance and ultimately improved speech perception. In the current study, the effect of short-term caffeine consumption on speech and noise simultaneous reception function was evaluated using acceptable noise level (ANL) test.Methods: In this interventional double-blind study, 90 cases (45 male, 45 female) aged 18−34 years were randomly assigned into three groups: the test groups, 3 and 5 mg/kg caffeine, and the control group, just placebo. The ANL test was recorded before and one hour after intervention. The results were compared before and after taking caffeine in three groups.Results: The statistical analysis revealed that there was significant difference in ANL result in dose 3 mg/kg caffeine before and one hour after intervention (p=0.043) and there was a significant difference in ANL result in dose 5 mg/kg caffeine before and one hour after intervention (p=0.001). Also, there was a significant difference in ANL before and one hour after taking caffeine between the group receiving 3 mg/kg dose of caffeine and the 5 mg/kg dose of caffeine (p=0.015).Conclusion: According to the findings of the study, after an hour of caffeine consumption, the ANL decreases. In other words, the individuals tolerate higher levels of speech noise. This is also dependent on the dose of caffeine.
Background and Aim: Subjective tinnitus is a phantom auditory perception caused by different factors and affects the patient’s quality of life. The tinnitus pathophysiology is not fully understood; therefore, there is no effective treatment for tinnitus. Along with other methods, auditory evoked potentials (AEPs) may be helpful in understanding this condition and the involved structures. This study aimed to review the applications of AEPs in tinnitus studies. Recent Findings: The studies investigating tinnitus were categorized into three groups of tinnitus pathophysiology, pre- or post-treatment/intervention evaluation of tinnitus, and objective diagnosis of tinnitus. Contradictory and unrepeatable findings were observed in each group. Conclusion: Discrepancies in the results of AEPs studies can be due to between-group and within-group differences, lack of proper matching in terms of tinnitus etiology and hearing loss, and difference in neurophysiologic models of tinnitus.
Background and Aim: Caffeine intake enhances concentration through affecting brain functions. It also improves attention to the signal which is believed to be associated with increased noise tolerance and improved speech perception. This study aimed to evaluate the long-term effects of caffeine intake on simultaneous speech and sound perception in people with normal hearing. Methods: This double-blind study was conducted on 90 people aged 18-34 years (45 males and 45 females), randomly assigned to two intervention groups (receiving 3 and 5 mg/kg caffeine) and a control group (receiving placebo). The acceptable noise level (ANL) test was conducted before and five hours after intervention. Results: Comparison of ANL scores before and after intervention showed a significant difference in the 3 mg/kg caffeine group (p=0.002), but not in the placebo (p=0.497) and 5 mg/kg caffeine (p=0.146) groups. Between-group analysis showed a significant difference between the placebo and 3 mg/kg caffeine groups in the ANL five hours after (p=0.005), while the difference was not significant between the placebo and the 5 mg/kg caffeine groups (p=0.139). Moreover, there was no significant difference in the ANL between the 3 and 5 mg/ kg caffeine groups (p=0.148). Conclusion: Caffeine intake affects noise tolerance, depending on the dose of caffeine. The ANL and speech tolerance improve five hours after consuming 3 mg/kg of caffeine. Keywords: Caffeine; noise perception; normal hearing; acceptable noise level test
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