scholarly journals Dichotic listening deficits in amblyaudia are characterized by aberrant neural oscillations in auditory cortex

2020 ◽  
Author(s):  
Sara Momtaz ◽  
Deborah W. Moncrieff ◽  
Gavin M. Bidelman
Keyword(s):  
Functional Connectivity ◽  
Auditory Cortex ◽  
Language Learning ◽  
Auditory Processing ◽  
Dichotic Listening ◽  
Neural Oscillations ◽  
Complex Sounds ◽  
Time Frequency ◽  
Right Ear Advantage ◽  
The Right

ABSTRACTChildren diagnosed with auditory processing disorder (APD) show deficits in processing complex sounds that are associated with difficulties in higher-order language, learning, cognitive, and communicative functions. Amblyaudia (AMB) is a subcategory of APD characterized by abnormally large ear asymmetries in dichotic listening tasks. Here, we examined frequency-specific neural oscillations and functional connectivity via high-density EEG in children with and without AMB during passive listening of nonspeech stimuli. Time-frequency maps of these “brain rhythms” revealed stronger phase-locked beta-gamma (∼35 Hz) oscillations in AMB participants within bilateral auditory cortex for sounds presented to the right ear, suggesting a hypersynchronization and imbalance of auditory neural activity. Brain-behavior correlations revealed neural asymmetries in cortical responses predicted the larger than normal right-ear advantage seen in participants with AMB. Additionally, we found weaker functional connectivity in the AMB group from right to left auditory cortex, despite their stronger neural responses overall. Our results reveal abnormally large auditory sensory encoding and an imbalance in communication between cerebral hemispheres (ipsi-to -contralateral signaling) in AMB. These neurophysiological changes might lead to the functionally poorer behavioral capacity to integrate information between the two ears in children with AMB.

scholarly journals Neurophysiological Evaluation of Right-Ear Advantage During Dichotic Listening

2021 ◽  
Vol 12 ◽  
Author(s):  
Keita Tanaka ◽  
Bernhard Ross ◽  
Shinya Kuriki ◽  
Tsuneo Harashima ◽  
Chie Obuchi ◽  
...  
Keyword(s):  
Steady State ◽  
Auditory Cortex ◽  
Dichotic Listening ◽  
Steady State Response ◽  
State Response ◽  
Auditory Steady State Response ◽  
Left And Right ◽  
Ear Advantage ◽  
Right Ear Advantage ◽  
The Right

Right-ear advantage refers to the observation that when two different speech stimuli are simultaneously presented to both ears, listeners report stimuli more correctly from the right ear than the left. It is assumed to result from prominent projection along the auditory pathways to the contralateral hemisphere and the dominance of the left auditory cortex for the perception of speech elements. Our study aimed to investigate the role of attention in the right-ear advantage. We recorded magnetoencephalography data while participants listened to pairs of Japanese two-syllable words (namely, “/ta/ /ko/” or “/i/ /ka/”). The amplitudes of the stimuli were modulated at 35 Hz in one ear and 45 Hz in the other. Such frequency-tagging allowed the selective quantification of left and right auditory cortex responses to left and right ear stimuli. Behavioral tests confirmed the right-ear advantage, with higher accuracy for stimuli presented to the right ear than to the left. The amplitude of the auditory steady-state response was larger when attending to the stimuli compared to passive listening. We detected a correlation between the attention-related increase in the amplitude of the auditory steady-state response and the laterality index of behavioral accuracy. The right-ear advantage in the free-response dichotic listening was also found in neural activities in the left auditory cortex, suggesting that it was related to the allocation of attention to both ears.

scholarly journals Lateralization of Auditory Processing of Silbo Gomero

Symmetry ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1183
Author(s):  
Pamela Villar González ◽  
Onur Güntürkün ◽  
Sebastian Ocklenburg
Keyword(s):  
Language Processing ◽  
Auditory Processing ◽  
Dichotic Listening ◽  
Relative Increase ◽  
Control Group ◽  
Language Lateralization ◽  
Ear Advantage ◽  
Listening Task ◽  
Right Ear Advantage ◽  
The Right

Left-hemispheric language dominance is a well-known characteristic of the human language system. However, it has been shown that leftward language lateralization decreases dramatically when people communicate using whistles. Whistled languages present a transformation of a spoken language into whistles, facilitating communication over great distances. In order to investigate the laterality of Silbo Gomero, a form of whistled Spanish, we used a vocal and a whistled dichotic listening task in a sample of 75 healthy Spanish speakers. Both individuals that were able to whistle and to understand Silbo Gomero and a non-whistling control group showed a clear right-ear advantage for vocal dichotic listening. For whistled dichotic listening, the control group did not show any hemispheric asymmetries. In contrast, the whistlers’ group showed a right-ear advantage for whistled stimuli. This right-ear advantage was, however, smaller compared to the right-ear advantage found for vocal dichotic listening. In line with a previous study on language lateralization of whistled Turkish, these findings suggest that whistled language processing is associated with a decrease in left and a relative increase in right hemispheric processing. This shows that bihemispheric processing of whistled language stimuli occurs independent of language.

The effect of stimulus intensity on the right ear advantage in dichotic listening

2008 ◽  
Vol 431 (1) ◽  
pp. 90-94 ◽  
Author(s):  
Kenneth Hugdahl ◽  
René Westerhausen ◽  
Kimmo Alho ◽  
Svyatoslav Medvedev ◽  
Heikki Hämäläinen
Keyword(s):  
Stimulus Intensity ◽  
Dichotic Listening ◽  
Ear Advantage ◽  
Right Ear Advantage ◽  
The Right

The Effect of Memory Load on the Right Ear Advantage in Dichotic Listening

1973 ◽  
Vol 53 (1) ◽  
pp. 368-369 ◽  
Author(s):  
Grace Yeni‐Komshian ◽  
Joel Gordon ◽  
Paul Sherman
Keyword(s):  
Dichotic Listening ◽  
Memory Load ◽  
Ear Advantage ◽  
Right Ear Advantage ◽  
The Right

Dichotic Listening: Elimination of the Right Ear Advantage Under a Dual Task Procedure

1997 ◽  
Vol 4 (3) ◽  
pp. 171-175 ◽  
Author(s):  
Marien Gadea ◽  
Raul Espert ◽  
Javier Chirivella
Keyword(s):  
Dual Task ◽  
Dichotic Listening ◽  
Ear Advantage ◽  
Right Ear Advantage ◽  
The Right

scholarly journals Relations between hemispheric asymmetries of grey matter and auditory processing of spoken syllables in 281 healthy adults

2020 ◽  
Author(s):  
Tulio Guadalupe ◽  
Xiang-Zhen Kong ◽  
Sophie E. A. Akkermans ◽  
Simon E. Fisher ◽  
Clyde Francks
Keyword(s):  
Auditory Cortex ◽  
Speech Processing ◽  
Auditory Processing ◽  
Dichotic Listening ◽  
Grey Matter ◽  
Magnetic Resonance Images ◽  
Hemispheric Dominance ◽  
Subcortical Structures ◽  
Hemispheric Asymmetries ◽  
Ear Advantage

AbstractMost people have a right-ear advantage for the perception of spoken syllables, consistent with left hemisphere dominance for speech processing. However, there is considerable variation, with some people showing left-ear advantage. The extent to which this variation is reflected in brain structure remains unclear. We tested for relations between hemispheric asymmetries of auditory processing and of grey matter in 281 adults, using dichotic listening and voxel-based morphometry. This was the largest study of this issue to date. Per-voxel asymmetry indexes were derived for each participant following registration of brain magnetic resonance images to a template that was symmetrized. The asymmetry index derived from dichotic listening was related to grey matter asymmetry in clusters of voxels corresponding to the amygdala and cerebellum lobule VI. There was also a smaller, non-significant cluster in the posterior superior temporal gyrus, a region of auditory cortex. These findings contribute to the mapping of asymmetrical structure-function links in the human brain, and suggest that subcortical structures should be investigated in relation to hemispheric dominance for speech processing, in addition to auditory cortex.

Differential Attention Effects on Dichotic Listening

2005 ◽  
Vol 16 (04) ◽  
pp. 205-218 ◽  
Author(s):  
Jennifer B. Shinn ◽  
Jane A. Baran ◽  
Deborah W. Moncrieff ◽  
Frank E. Musiek
Keyword(s):  
Young Adults ◽  
Free Recall ◽  
Auditory Processing ◽  
Dichotic Listening ◽  
The Other ◽  
Test Procedures ◽  
Differential Attention ◽  
The Right ◽  
Clinical Domain

The role of attention in the differentiation of auditory processing disorders from attention deficit disorders is gaining considerable interest in both the clinical and research arenas. It has been well established that when attention is directed to one ear or the other on traditional dichotic tests, performance can be altered. However, preliminary studies in our laboratory have shown that dichotic fusion paradigms are resistant to shifts in ear performance associated with changes in attention. The purpose of this study was to assess the performance of normal listeners on a dichotic consonant-vowel and a dichotic rhyme (fusion) test. Both test procedures were administered to 20 young adults in three different listening conditions (free recall, attention directed to the left ear, and attention directed to the right ear). Results from this study supported the hypothesis that dichotic rhyme tests are resistant to alterations in the laterality of attention and have implications for the development of test paradigms that can be used to segregate attention from pure auditory deficits in the clinical domain.

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