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1
Learning from the Longitudinal Outcomes of Children with Hearing Impairment (LOCHI) study: summary of 5-year findings and implications
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2
Investigating the interaction between dichotic deficits and cognitive abilities using the Dichotic Digits difference Test (DDdT) part 2
Cameron, Sharon; Glyde, Helen; Dillon, Harvey. - : American Academy of Audiology, 2016
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3
Cortical auditory evoked potentials in (un)aided normal-hearing and hearing-impaired adults
Van Dun, Bram; Kania, Anna; Dillon, Harvey. - : Thieme Medical Publishers, 2016
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4
Development of telscreen : a telephone-based speech-in-noise hearing screening test with a novel masking noise and scoring procedure
Dillon, Harvey; Beach, Elizabeth Francis; Seymour, John. - : Taylor & Francis, 2016
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The Dichotic Digits difference Test (DDdT) : development, normative data, and test-retest reliability studies part 1
Cameron, Sharon; Glyde, Helen; Dillon, Harvey; Whitfield, Jessica; Seymour, John. - : American Academy of Audiology, 2016
Abstract: Background: The dichotic digits test is one of the most widely used assessment tools for central auditory processing disorder. However, questions remain concerning the impact of cognitive factors on test results. Purpose: To develop the Dichotic Digits difference Test (DDdT), an assessment tool that could differentiate children with cognitive deficits from children with genuine dichotic deficits based on differential test results. The DDdT consists of four subtests: dichotic free recall (FR), dichotic directed left ear (DLE), dichotic directed right ear (DRE), and diotic. Scores for six conditions are calculated (FR left ear [LE], FR right ear [RE], and FR total, as well as DLE, DRE, and diotic). Scores for four difference measures are also calculated: dichotic advantage, right-ear advantage (REA) FR, REA directed, and attention advantage. Research Design: Experiment 1 involved development of the DDdT, including error rate analysis. Experiment 2 involved collection of normative and test-retest reliability data. Study Sample: Twenty adults (aged 25 yr 10 mo to 50 yr 7 mo, mean 36 yr 4 mo) took part in the development study; 62 normal-hearing, typically developing, primary-school children (aged 7 yr 1 mo to 11 yr 11 mo, mean 9 yr 4 mo) and 10 adults (aged 25 yr 0 mo to 51 yr 6 mo, mean 34 yr 10 mo) took part in the normative and test-retest reliability study. Data Collection and Analysis: In Experiment 1, error rate analysis was conducted on the 36 digit-pair combinations of the DDdT. Normative data collected in Experiment 2 were arcsine transformed to achieve a distribution that was closer to a normal distribution and z-scores calculated. Pearson productmoment correlations were used to determine the strength of relationships between DDdT conditions. Results: The development study revealed no significant differences in the adult population between test and retest on any DDdT condition. Error rates on 36 digit pairs ranged from 1.5% to 16.7%. The most and the least error-prone digits were removed before commencement of the normative data study, leaving 25 unique digit pairs. Average z-scores calculated from the arcsine-transformed data collected from the 62 children who took part in the normative data study revealed that FR dichotic processing (LE, RE, and total) was highly correlated with diotic processing (/"ranging from 0.5 to 0.6; p < 0.0001). Significant improvements in performance on retest occurred for the FR LE, RE, total, and diotic conditions (pranging from 0.05 to 0.0004), the conditions that would be expected to improve with practice if the participant’s response strategies are better the second time around. Conclusions: The addition of a diotic control task—that shares many response demands with the usual dichotic tasks—opens up the possibility of differentiating children who perform below expectations because of poor dichotic processing skills from those who perform poorly because of impaired attention, memory, or other cognitive abilities. The high correlation between dichotic and diotic performance suggests that factors other than dichotic performance play a substantial role in a child’s ability to perform a dichotic listening task. This hypothesis is investigated further in the cognitive correlation study that follows in the companion paper (DDdT Study Part 2; Cameron et al, 2016). ; 12 page(s)
Keyword: central auditory processing disorder; dichotic; diotic; directed; free recall; impulsivity; sustained attention
URL: http://hdl.handle.net/1959.14/1221638
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6
Cortical auditory-evoked potentials in response to multitone stimuli in hearing-impaired adults
Bardy, Fabrice; Sjahalam-King, Jessica; Van Dun, Bram. - : American Academy of Audiology, 2016
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7
Results from a national central auditory processing disorder service : a real-world assessment of diagnostic practices and remediation for central auditory processing disorder
Cameron, Sharon; Glyde, Helen; Dillon, Harvey. - : Thieme Medical Publishers, 2015
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8
The Development of the Mealings, Demuth, Dillon, and Buchholz Classroom Speech Perception Test
Mealings, Kiri T; Demuth, Katherine; Buchholz, Jörg. - : American Speech-Language-Hearing Association, 2015
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9
The Effect of different open plan and enclosed classroom acoustic conditions on speech perception in Kindergarten children
Mealings, Kiri T; Demuth, Katherine; Buchholz, Jörg. - : Acoustical Society of America, 2015
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10
An Assessment of different sized open plan and enclosed kindergarten classroom listening environments
Mealings, Kiri T; Demuth, Katherine; Buchholz, Jorg M. - : Australian Acoustical Society, 2015
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11
Effect of audibility on spatial release from speech-on-speech masking
Glyde, Helen; Buchholz, Jörg M; Nielsen, Lillian. - : Acoustical Society of America, 2015
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12
The Audiological journey and early outcomes of twelve infants with auditory neuropathy spectrum disorder from birth to two years of age
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13
Investigating the acoustics of a sample of open plan and enclosed Kindergarten classrooms in Australia
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14
The Impact of auditory processing and cognitive abilities in children
Tomlin, Dani; Dillon, Harvey; Sharma, Mridula. - : Lippincott Williams & Wilkins, 2015
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15
Estimating hearing thresholds in hearing-impaired adults through objective detection of cortical auditory evoked potentials
Van Dun, Bram; Dillon, Harvey; Seeto, Mark. - : American Academy of Audiology, 2015
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16
The Cortical automatic threshold estimation in adults
Bardy, Fabrice; Van Dun, Bram; Dillon, Harvey. - : Lippincott Williams & Wilkins, 2015
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17
Bigger is better : increasing cortical auditory response amplitude via stimulus spectral complexity
Bardy, Fabrice; Van Dun, Bram; Dillon, Harvey. - : Lippincott Williams & Wilkins, 2015
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18
An Evaluation of the performance of two binaural beamformers in complex and dynamic multitalker environments
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19
Evaluation of headphone effects on performance in the LiSN & Learn auditory training software
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20
Effect of audibility on spatial release from speech-on-speech masking
Glyde, Helen; Buchholz, Jorg M.; Nielsen, Lillian. - : Acoustical Society of America, 2015
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