![]() ![]() Analysis showed that the patient, in contrast to the normal sample, revealed a complete right-ear extinction phenomenon, irrespective of attentional instruction. Her performance was compared with data from a previously collected sample of normal left-handed females. In the forced-left condition, she was instructed to attend to and to report only from the left-ear input. In the forced-right condition, she was instructed to attend to and report only from the right ear input. In the free-report condition, she was free to divert attention to and to report from both ear inputs. As both her expressive and receptive language functions were intact after the lesion, it was assumed that the right hemisphere was the language-dominant one. The major aim of the study was to evaluate a structural vs attentional explanation for dichotic listening. However, further studies should investigate whether callosal fibers between primary and secondary auditory cortices, or between higher level multimodal cortices, are vital for the detection of left ear targets in dichotic listening.ĭichotic listening during forced-attention in a patient with left hemispherectomy.Ī young left-handed girl with an extensive posttraumatic lesion in the left hemisphere was tested with dichotic listening (DL) under three different attentional instructions. The authors' data may indicate that auditory callosal fibers pass through the splenium more posterior than previously thought. Moreover, directed attention to the left ear did not improve left ear target detection in the patients, independent of callosal lesion location. This was found in both a rapid presentation dichotic monitoring task and a standard dichotic listening task, ruling out attentional limitations in the processing of high stimulus loads as a confounding factor. The authors found splenial lesions to be associated with left ear suppression in dichotic listening of consonant-vowel syllables. Pollmann, Stefan Maertens, Marianne von Cramon, D Yves Lepsien, Joeran Hugdahl, Kenneth The meta-analysis included 249 effect sizes pertaining to sex differences and…ĭichotic listening in patients with splenial and nonsplenial callosal lesions. This was achieved by means of a meta-analysis of the literature dating back from the initial use of dichotic listening as a measure of laterality. The present study quantified the magnitude of sex differences in perceptual asymmetries as measured with dichotic listening. The present results confirm the assumption that dichotic listening with CV syllables measures an aspect of language perception and language skills that is related to general language comprehension. The analyses yielded a positive correlation between the right ear score in DL and language comprehension, an effect that was stronger when attending to the right ear. Thus, a stronger correlation between language comprehension skills and the dichotic listening performance when attending to the right ear was expected. In addition, directing attention to one ear input was believed to reduce the influence of random factors, and thus show a more concise estimate of left hemisphere language capacity. However, since the left ear score is believed to be an error when assessing language laterality, covariation was expected for the right ear scores only. A high correlation between the language scores and the dichotic listening performance was expected. In the present study, we tested samples of reading-impaired and normally achieving children between 10 and 13 years of age with tests of reading skills, language comprehension, and dichotic listening to consonant-vowel (CV) syllables. In particular, language comprehension should show close correspondence to perception of language stimuli. However, the documentation of a relationship between language functions and dichotic listening performance is sparse, although it is accepted that dichotic listening measures language perception. ![]() Results of studies using DL have indicated that language is lateralized in children with…ĭichotic listening performance predicts language comprehension.ĭichotic listening performance is considered a reliable and valid procedure for the assessment of language lateralisation in the brain. Use of the Dichotic Listening Technique with Learning DisabilitiesĮRIC Educational Resources Information Centerĭichotic listening (DL) techniques have been used extensively as a non-invasive procedure to assess language lateralization among children with and without learning disabilities (LD), and with individuals who have other auditory system related brain disorders. ![]()
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