Purpose The effects of neurological diseases on the auditory system have been a notable issue for investigators because the auditory pathway is closely associated with neural systems. The purposes of this study are to evaluate the efferent auditory system function and hearing quality in Parkinson's disease (PD) and to compare the findings with age-matched individuals without PD to present a perspective on aging. Method The study included 35 individuals with PD (mean age of 48.50 ± 8.00 years) and 35 normal-hearing peers (mean age of 49 ± 10 years). The following tests were administered for all participants: the first section of the Speech, Spatial and Qualities of Hearing Scale; pure-tone audiometry, speech audiometry, tympanometry, and acoustic reflexes; and distortion product otoacoustic emissions (DPOAEs) and contralateral suppression of DPOAEs. SPSS Version 25 was used for statistical analyses, and values of p < .05 were considered statistically significant. Results There were no statistically significant differences in the pure-tone audiometry thresholds and DPOAE responses between the individuals with PD and their normal-hearing peers ( p = .732). However, statistically significant differences were found between the groups in suppression levels of DPOAEs and hearing quality ( p < .05). In addition, a statistically significant and positive correlation was found between the amount of suppression at some frequencies and the Speech, Spatial and Qualities of Hearing Scale scores. Conclusions This study indicates that medial olivocochlear efferent system function and the hearing quality of individuals with PD were affected adversely due to the results of PD pathophysiology on the hearing system. For optimal intervention and follow-up, tasks related to hearing quality in daily life can also be added to therapies for PD.

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Background/Aim: The sense of sound in the absence of external acoustic stimuli is known as subjective tinnitus, or phantom tinnitus. The purpose of this study was whether tinnitus complaints have an impact on perceived stress and cognitive skills like attention and memory. Methods: This prospective case-control study comprised 60 healthy volunteers between the ages of 18 and 25, all of whom had normal hearing. Using the G*Power program, it was established that a minimum of 50 people should be worked with an 80 percent power and a 5% margin of error. The study group consisted of 30 people with tinnitus complaints in their daily lives, whereas the control group consisted of the remaining people. Tinnitus Handicap Inventory and Perceived Stress Scale were applied to the participants within the scope of the working hypotheses. In terms of cognitive skills, the Stroop Test Form was applied to evaluate selective attention, focused attention and disruptive effects, and the Visual Auditory Digit Sequence Test Form was applied to evaluate short-term memory and working memory skills. The findings were analyzed with the SPSS program. Type 1 error level is determined as 5%. Results: According to Tinnitus Handicap Inventory, tinnitus complaint of all individuals in the study group is very mild. The statistically significant differences were found between the perceived stress level, Stroop and Visual Auditory Digit Sequence Test scores between people with and without tinnitus complaints. The poorer performance was observed in the group with tinnitus complaint. (P=0.037, P=0.017, P=0.010). No statistically significant relationship was found between perceived stress level, tinnitus and cognitive skills (P=0.067, P=0.160, P=0.208). Conclusion: Tinnitus is becoming a more common cause of health problems, sometimes coupled by psychological stress, and it affects cognitive skills. The study adds to the knowledge regarding the use of cognitive tests as a supplemental measurement in the evaluation of tinnitus and the impact of tinnitus on daily cognitive abilities.

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Background. Hepatic glycogen storage diseases are a group of diseases manifesting mainly with hypoglycemia and hepatomegaly. The patients require frequent daytime and nocturnal feedings. Hypoglycemia may cause sensorineural hearing loss and nocturnal feeding is a risk factor for the development of gastroesophageal reflux that may cause chronic otitis media and hearing loss consequently. We aimed to determine the prevalence and characteristics of hearing loss in hepatic glycogen storage diseases. Methods. A total of 24 patients with hepatic glycogen storage disease (15 glycogen storage disease type I and 9 non type I) and 24 age/sex matched healthy controls were enrolled in the study. Pure tone audiometer, immitansmetry, acoustic reflex measurement, otoacoustic emission test (OAE) and auditory brainstem response (ABR) tests were applied to all participants. Results. Hearing loss was determined in 17/24 patients (12 glycogen storage disease type I and 5 non type I) with pure tone audiometer. Interpretation of all the findings revealed a total of 8 patients had conductive and 9 had mixed hearing loss. All parameters were significantly different than the control group. Conclusions. This is the first study to comprehensively assess the auditory functions of patients with hepatic glycogen storage disease. Audiological findings determined a significantly increased prevalence of conductive/ mixed type hearing loss in the patient group which is a new finding in the literature. Further studies with extended patient numbers are required to enlighten the underlying pathophysiology.