Background:Classic dichotic listening tests using speech stimuli result in right ear advantage,due to the dominant crossed pathway for speech and language.It is presumed that similar crossed dominance could exist for ...Background:Classic dichotic listening tests using speech stimuli result in right ear advantage,due to the dominant crossed pathway for speech and language.It is presumed that similar crossed dominance could exist for non-speech stimuli too.Hence,this is an attempt to develop and validate the dichotic nonspeech test using environmental stimuli and explore the effect of focused attention on this test.Materials and method:Three lists of dichotic stimuli were created using these sounds with fifteen tokens in each list.Four professionals and non-professionals validated these materials.Normative estimation was obtained by administering the newly developed test on 70 adults and 70 children using a free-recall and forced-recall condition.Result:The results showed a significant difference between the left ear and right scores where the left ear score was better than the right,depicting left ear advantage(LEA)for free recall condition in both groups.In the forced recall condition,LEA was not seen;rather the mean score was significantly higher in the attended ear,irrespective of the stimuli presented to the right or left ear.The test-retest reliability in free recall was good in both the ears and moderate for forced right ear conditions.Conclusion:The novel test consistently showed LEA with good reliability and can be used to assess the hemispheric asymmetry in normal subjects and also in test batteries for the clinical population.展开更多
Tinnitus is a concerning condition that affects most adults worldwide,with a prevalence of 6.7%.Theories of tinnitus have explained that an increase in spontaneous neural activity at the level of the thalamus could in...Tinnitus is a concerning condition that affects most adults worldwide,with a prevalence of 6.7%.Theories of tinnitus have explained that an increase in spontaneous neural activity at the level of the thalamus could induce tinnitus.There are no standardized objective tests for tinnitus assessment because of its multifaceted nature.Hence,the current study aimed to explore the effect of Tinnitus on Latency and Amplitude of the Auditory Middle Latency Response in Audiological Attendees.The study recruited 50 individuals(25 normals and 25 individuals with tinnitus)who underwent audiological evaluations like Pure tone audiometry,immittance,pitch and loudness matching,THI and middle latency response.The IHS program was used to record MLR,which was obtained using tone burst stimuli of 500 Hz,1 KHz,2 KHz,and 4 KHz at a rate of 7.1/s with a constant duration of 5 ms,for a total of 1500 sweeps.As a covariate,pure tone thresholds were one of the variabilities that were addressed by ANCOVA.The amplitude of the Pa component varied significantly between the tinnitus and control groups,according to the MLR data and no other components of MLR reached that significance.Furthermore,there was no discernible variation in the latency or amplitude of MLR among any of the other components.The latency of the waveforms increased as the stimulus frequency increased.Karl Pearson correlation coefficient showed no significant correlation between THI scores and any of the outcome measures except for Pa amplitude.As the Pa component of MLR showed maximum changes between controls and individuals with tinnitus,the Pa component could be considered a potential tool for identifying neurophysiological changes related to tinnitus.展开更多
基金supported by the cognitive science research initiative of the Department of science and technologyGovernment of India Grant ID:DST/CSRI/2017/442.
文摘Background:Classic dichotic listening tests using speech stimuli result in right ear advantage,due to the dominant crossed pathway for speech and language.It is presumed that similar crossed dominance could exist for non-speech stimuli too.Hence,this is an attempt to develop and validate the dichotic nonspeech test using environmental stimuli and explore the effect of focused attention on this test.Materials and method:Three lists of dichotic stimuli were created using these sounds with fifteen tokens in each list.Four professionals and non-professionals validated these materials.Normative estimation was obtained by administering the newly developed test on 70 adults and 70 children using a free-recall and forced-recall condition.Result:The results showed a significant difference between the left ear and right scores where the left ear score was better than the right,depicting left ear advantage(LEA)for free recall condition in both groups.In the forced recall condition,LEA was not seen;rather the mean score was significantly higher in the attended ear,irrespective of the stimuli presented to the right or left ear.The test-retest reliability in free recall was good in both the ears and moderate for forced right ear conditions.Conclusion:The novel test consistently showed LEA with good reliability and can be used to assess the hemispheric asymmetry in normal subjects and also in test batteries for the clinical population.
文摘Tinnitus is a concerning condition that affects most adults worldwide,with a prevalence of 6.7%.Theories of tinnitus have explained that an increase in spontaneous neural activity at the level of the thalamus could induce tinnitus.There are no standardized objective tests for tinnitus assessment because of its multifaceted nature.Hence,the current study aimed to explore the effect of Tinnitus on Latency and Amplitude of the Auditory Middle Latency Response in Audiological Attendees.The study recruited 50 individuals(25 normals and 25 individuals with tinnitus)who underwent audiological evaluations like Pure tone audiometry,immittance,pitch and loudness matching,THI and middle latency response.The IHS program was used to record MLR,which was obtained using tone burst stimuli of 500 Hz,1 KHz,2 KHz,and 4 KHz at a rate of 7.1/s with a constant duration of 5 ms,for a total of 1500 sweeps.As a covariate,pure tone thresholds were one of the variabilities that were addressed by ANCOVA.The amplitude of the Pa component varied significantly between the tinnitus and control groups,according to the MLR data and no other components of MLR reached that significance.Furthermore,there was no discernible variation in the latency or amplitude of MLR among any of the other components.The latency of the waveforms increased as the stimulus frequency increased.Karl Pearson correlation coefficient showed no significant correlation between THI scores and any of the outcome measures except for Pa amplitude.As the Pa component of MLR showed maximum changes between controls and individuals with tinnitus,the Pa component could be considered a potential tool for identifying neurophysiological changes related to tinnitus.
