Influence of Alignment Strategies and Consonant Acoustic Features on Laterality Index in Dichotic Testing in Indian Languages

2021 ◽  
Author(s):  
Indira Chenthamara Pazhayapisharath ◽  
Sanjana Singh Sathyanarayana ◽  
Vijaya Kumar Narne
Keyword(s):  
Indian Languages ◽  
Good Reliability ◽  
Hearing Sensitivity ◽  
Temporal Alignment ◽  
Laterality Index ◽  
Ear Advantage ◽  
The Difference ◽  
Right Ear Advantage ◽  
The Right ◽  
Age Range

Abstract Background The right ear advantage (REA) observed for dichotic CV (DCV) testing in Indian languages is seen to be smaller compared with the observations in several studies in English and other languages. Purpose The present study aims to explore whether the differences in the temporal alignment of consonant–vowel (CV) stimuli used for the dichotic task is a contributing factor that can explain the smaller REAs observed in Indian languages. Research Design The study compared the laterality index (LI) values between DCV test results obtained using CV stimuli that were temporally aligned at the acoustic onset versus the burst onset, with 0 milliseconds lag between the right and left ears. Study Sample A total of 50 right-handed individuals (native speakers of Kannada language) in the age range of 17 to 30 years with normal hearing sensitivity participated in the study. Data Collection and Analysis The participants' responses to the two sets of DCV stimuli were recorded and compared. LI was calculated for the overall scores as well as for specific voiced and unvoiced segment combinations. To test the reliability of the findings, 10 of the participants were re-tested using the same stimuli and the data were checked for reliability. Results The overall LI was 15.1% for the stimuli temporally aligned at the burst onset, whereas it was 5.7% for the stimuli temporally aligned at the acoustic onset. The difference in LI was not significant between the alignment conditions for unvoiced–unvoiced and voiced–voiced CV combinations, but this difference was significant for the unvoiced–voiced and voiced–unvoiced CV combinations. Comparing test and re-test scores showed good reliability. Conclusion The results support our hypothesis that smaller REA observed in DCV task in Indian languages was due to the temporal alignment of CV stimuli. In the acoustic-onset-aligned condition, presenting pairs contrasting in the voicing feature tends to cancel out a relative ear advantage.

scholarly journals Comparison of Children’s Double Dichotic Digits and SCAN-3 Competing Words Free Recall Scores

2019 ◽  
Vol 30 (05) ◽  
pp. 363-369
Author(s):  
Kairn Stetler Kelley ◽  
Benjamin Littenberg
Keyword(s):  
Free Recall ◽  
Kappa Statistic ◽  
Test Results ◽  
Cut Scores ◽  
Hearing Sensitivity ◽  
Study Visit ◽  
Decision Consistency ◽  
Single Study ◽  
Ear Advantage ◽  
The Right

AbstractPractice guidelines do not specify which test recordings are best for assessing dichotic deficit or interaural asymmetry. Dichotic Digits and SCAN-3 Competing Words Free Recall are among the most widely used dichotic tests, but it is not known if the choice of test results in important differences in the identification of children with deficits or if they can be used interchangeably.To determine whether two commonly used dichotic tests, SCAN-3 Competing Words Free Recall (CW) and Musiek’s Dichotic Digits (DD), agree on interaural asymmetry and dichotic deficit in children.CW and DD tests were administered to all participants. Each participant had a single study visit.Sixty volunteers aged 7–14 years with normal hearing sensitivity participated in the study.Hearing sensitivity, CW, and DD performance were measured at a single study visit. We used Spearman’s rho (ρ) to assess associations between rank ordering of participants by each test and the kappa statistic (κ) to assess decision consistency between tests.Participants were rank-ordered similarly by CW and DD for the right ear (ρ = 0.58), left ear (ρ = 0.51), and total (ρ = 0.73) scores, but not for interaural asymmetry (ρ =0.18). They agreed no better than chance on direction of ear advantage (κ = 0.01, p = 0.93) and had poor agreement on which children scored below cut-scores (κ = 0.22, p < 0.01). DD identified significantly more participants with deficits (n = 18) than CW (n = 3) (p < 0.001).Although children with high scores on one test tend to have high scores on the other, CW and DD do not agree on ear advantage or the presence of deficit. They are not interchangeable for clinical use. Additional research is needed to determine whether either is appropriate for identifying children who would benefit from treatment for dichotic listening deficits.

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 right-ear advantage in schizophrenia

1993 ◽  
Vol 32 (2) ◽  
pp. 221-223 ◽  
Author(s):  
Veena Shukla ◽  
Prakash B. Behere ◽  
Manas K. Mandal
Keyword(s):  
Ear Advantage ◽  
Right Ear Advantage ◽  
The Right

Dichotic Ear Effects with Digits and Tones: A Within-Subject Comparison

1979 ◽  
Vol 49 (2) ◽  
pp. 391-399 ◽  
Author(s):  
Evelyn Lee Teng
Keyword(s):  
Reliability And Validity ◽  
Test Material ◽  
Digital Input ◽  
Quick Test ◽  
Subject Variability ◽  
High Intelligence ◽  
Ear Advantage ◽  
Right Ear Advantage ◽  
The Right ◽  
Subject Comparison

56 right-handed adults (23 men, 33 women) with IQs ranging from 79 to 140 on the Quick Test each performed on two dichotic tests, one with digital input, one with tonal input. The average magnitude of the right-ear advantage for digits was comparable to that of the left-ear advantage for tones, but there was greater between-subject variability with tonal input than with digital input. Ear advantage with digits was unrelated with ear advantage with tones, and high intelligence was not associated with clearly opposite directions of ear advantage for the two types of test material. The results were discussed in terms of hemispheric specializations, as well as the reliability and validity of the dichotic ear effects.

Effect of Monaural Hearing Aid Use on Dichotic Test Results for Individuals with High-Frequency Hearing Impairment

1986 ◽  
Vol 51 (2) ◽  
pp. 161-169 ◽  
Author(s):  
Rauna K. Surr ◽  
Allen A. Montgomery ◽  
H. Gustav Mueller
Keyword(s):  
Hearing Impairment ◽  
High Frequency ◽  
Hearing Aid ◽  
Individual Variability ◽  
Test Results ◽  
Hearing Aid Fitting ◽  
Hearing Aid Use ◽  
Ear Advantage ◽  
Right Ear Advantage ◽  
The Right

It is well documented that the majority of individuals with normal hearing have a right ear advantage for dichotic speech material. There is evidence, however, that individuals with flat sensorineural hearing loss demonstrate a left ear advantage after they have used amplification on the left side. The present study examined whether these findings could be extended to a population with high-frequency hearing impairment. The subjects were administered dichotic consonant-vowel syllable tests prior to a monaural hearing aid fitting, and the tests were repeated after 1 month and again after 6 months of hearing aid use. The results revealed a group right ear advantage prior to the hearing aid fitting, although there was considerable individual variability. No consistent changes in the test scores were shown to be associated with monaural hearing aid use in either the right ear or the left ear.

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
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