Dichotic Word Listening Research Articles

BILINGUAL MEN BUT NOT WOMEN DISPLAY LESS LEFT EAR BUT NOT RIGHT EAR ACCURACY DURING DICHOTIC LISTENING COMPARED TO MONOLINGUALS

Thirty monolingual university men and women and 33 bilingual university men and women who had learned English after 5 years of age were administered Roberts Dichotic Word Listening Test. The bilingual men committed twice the numbers of errors for words presented to the left ear but not to the right ear or to both ears when compared to the bilingual women, the monolingual men, or the monolingual women. The latter three groups did not differ significantly from each other. This interaction between sex and language history explained about 16% of the variance in the numbers of errors for the left ear. The results are related to other studies that showed men who acquired English after the age of 5 years exhibited a relative weakness for verbal memory but not for figural memory compared to bilingual women or monolingual men and women. Implications for the relative accuracies of verbal memory are considered.

Delayed left ear accuracy during childhood and early adolescence as indicated by Roberts' Dichotic Word Listening Test.

A total of 200 girls and boys between the ages of 6 years and 15 years were administered Roberts' Dichotic Word Listening Test. A statistically significant relatively abrupt and maintained increase in left ear accuracy was noted after 9 years of age (eta = .55). Except for a mild improvement after 6 to 7 years of age, comparable changes were not observed for the right ear. The magnitude of the effect was not significantly diminished even after covariance for verbal fluency and semantic categorization. These results are compatible with the observations that myelination of the cerebral commissures and electroencephalographic phase relations of the right hemisphere achieve near-adult characteristics after 9 years of age. Boys displayed less accuracy for dichotic word listening, particularly for the left ear, compared to the girls eta = .20).

Subjective improvement following treatment with carbamazepine (Tegretol) for a subpopulation of patients with traumatic brain injuries.

Over a 3-yr period, 19 patients who had sustained brain traumas during motor vehicle incidents and who exhibited abnormal scores for a dichotic word-listening task and Roberts' Epileptic Spectrum Disorder Inventory more than one year after the injury were recommended for treatment with carbamazepine (Tegretol). The psychiatric profile of these patients, as defined by the Minnesota Multiphasic Personality Inventory, was similar to the profile of patients from other studies who had displayed more objective improvement following this treatment. Of the 14 patients 12 who followed the recommendation retrospectively reported that within a few weeks after treatment they experienced marked reductions in the incidence of sudden confusion and depression, increased attention and focus, and either elimination or attenuation of an aversive sensed presence. Such results suggest that many of the debilitating symptoms that persist for months to years after a traumatic brain injury may be electrical in nature rather than due to "psychological responses" and might be treatable by appropriate dosages of carbamazepine or other, e.g., Gabapentin (Neurontin) antiepileptic compounds.

SUBJECTIVE IMPROVEMENT FOLLOWING TREATMENT WITH CARBAMAZEPINE (TEGRETOL) FOR A SUBPOPULATION OF PATIENTS WITH TRAUMATIC BRAIN INJURIES

Over a 3-yr period, 19 patients who had sustained brain traumas during motor vehicle incidents and who exhibited abnormal scores for a dichotic word-listening task and Roberts' Epileptic Spectrum Disorder Inventory more than one year after the injury were recommended for treatment with carbamazepine (Tegretol). The psychiatric profile of these patients, as defined by the Minnesota Multiphasic Personality Inventory, was similar to the profile of patients from other studies who had displayed more objective improvement following this treatment. Of the 14 patients 12 who followed the recommendation retrospectively reported that within a few weeks after treatment they experienced marked reductions in the incidence of sudden confusion and depression, increased attention and focus and either elimination or attenuation of an aversive sensed presence. Such results suggest that many of the debilitating symptoms that persist for months to years after a traumatic brain injury may be electrical in nature rather than due to “psychological responses” and might be treatable by appropriate dosages of carbamazepine or other, e.g., Gabapentin (Neurontin) antiepileptic compounds.

Hypnotic induction profiles, contextual innuendo, and delayed intrusion errors for a narrative: searching for mediating variables.

18 young men and 18 women listened to an ambiguous narrative concerning the nocturnal experiences of a young boy and then, after an inventory on hypnotic induction and a dichotic word-listening task, were asked to estimate the prevalence of child abuse or abduction by aliens (a third group served as controls). One week later the subjects were asked to reconstruct the narrative. Scores for suggestibility, estimates of prevalence, the sense of a presence during the first sitting and less cerebral lateralization were loaded on the same factor. Although the three groups did not differ with respect to numbers of literal memories, the groups who were given either one of the two innuendos also included an additional 11% of inferences and paraphrases which were considered erroneous reconstructions of the memory of the narrative.

Dichotic Word Listening Test Performance and side of lesion in CVA

Dichotic Word Listening Test Performance and side of lesion in CVA

Dichotic Word Listening Test Performance and side of lesion in CVA

Dichotic Word Listening Test Performance and side of lesion in CVA

Episodic symptoms in dysfunctioning children and adolescents following mild and severe traumatic brain injury.

The present investigation examines the phenomenology of episodic symptoms in dysfunctioning children and adolescents following mild (n = 25) or severe (n = 25) traumatic brain injury (TBI). TBI patients in both groups commonly endorsed symptoms such as staring spells, memory gaps, and temper outbursts. Anticonvulsant response in the 27 patients treated, reflected moderate to substantial improvement in 92%. A dose-response relationship between injury severity and number of episodic symptoms was not observed; however, patients in the severe TBI sample did produce significantly more defective performances on a dichotic word-listening task (DWLT) and lower IQ values. Defective DWLT performance was also significantly associated with greater number of episodic symptoms endorsed, but only in the mild TBI sample. Parallels with epilepsy spectrum disorder and clinical implications for paediatric TBI are discussed.

Functional significance of individual variations in callosal area

We considered the hypothesis that the richness of callosal interhemispheric connections has a role in determining the degree of behavioural laterality and time-sharing ability in dual-task performance. Behavioural laterality as measured by dichotic word listening, line bisection and turning bias tests correlated inversely with the midsagittal cross-sectional area of the corpus callosum, as seen on MRI. The amount of dual task interference was strongly inversely correlated with the callosal area in both within-hemisphere and between-hemispheres conditions. These relationships between normal variations in callosal area, and outcomes on tests both of laterality and time-sharing capacity in normal adults suggest that the corpus callosum assumes a cross-excitatory role when subjects perform these tasks.

The Dichotic Word Listening Test: Preliminary observations in American and Canadian samples

The present article describes observations of 670 American and Canadian child and adult control subjects on the recently developed Dichotic Word Listening Test (DWLT). The task was also administered to a sample of American children with traumatic brain injuries (n=21) of varying severity and a sample of American adults with mild traumatic injuries (n=36). The conceptual focus in this line of research was on using normative observations to identify clinically defective channels of auditory processing among patients. The principal findings were as follow: 1) the DWLT was sensitive to the effects of cerebral dysfunction following traumatic brain injury; 2) differences among normal samples with different demographic backgrounds were frequently observed, arguing for the development of local norms; 3) a shorter form of the DWLT task (DWLT30) can be used for screening purposes with relatively little reduction in sensitivity to cerebral dysfunction; 4) there appeared to be considerable improvement of DWLT performance between the ages of five and seven, due largely to higher scores from the left auditory channel; and 5) there were indications that use of French (rather than English) as one's native language before age six can negatively influence performance in adulthood on an English version of the DWLT. In general, the present findings suggest that the DWLT is likely to have relatively broad applicability for neuropsychological assessment across the life-span.

The Dichotic Word Listening Test: Preliminary observations in American and Canadian samples

The Dichotic Word Listening Test: Preliminary observations in American and Canadian samples