Tehran University of Medical Sciences Auditory and Vestibular Research 2423-480X 25 3 2016 10 08 153 158 EN Nastaran Ranjbar Department of Audiology, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran Ali Akbar Tahaei Department of Postgraduate, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran Hassan Ashayeri Department of Postgraduate, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran Mohammad Kamali Department of Basic Sciences, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran Hossein Namvar Arefi Department of Audiology, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran 2016 08 22 2016 09 06 Background and Aim: Tinnitus is perception of sound in absence of external source. Reaction time is the time between sensory stimuli and a behavior. Alternation of auditory reaction time has been shown in the literature in patients with tinnitus. This study has investigated the auditory reaction time in quiet and noise to different frequencies. Methods: Fifteen subjects with chronic tinnitus participated in this study. Basic auditory test and tinnitus evaluations were carried out. In order to measure auditory reaction time, the participants were instructed to press a button after hearing the target sound. Xnote Stopwatch software measured reaction times and data were collected. Results: Auditory reaction time to the tinnitus frequency stimulus decreases significantly (p<0.05) in tinnitus subjects in both quiet and noise conditions. This alternation is significantly different in noise compared to the quiet condition (p<0.05). Conclusion: Based on the results, noise can reduce auditory reaction time significantly. Also, alternation of auditory reaction time to the tinnitus frequency –especially in noise –ould suggest different central processing of the tinnitus frequency in tinnitus subjects.  https://avr.tums.ac.ir/index.php/avr/article/view/110 https://avr.tums.ac.ir/index.php/avr/article/download/110/56