Dichotic listening in patients with situs inversus: brain asymmetry and situs asymmetry

Citation
S. Tanaka et al., Dichotic listening in patients with situs inversus: brain asymmetry and situs asymmetry, NEUROPSYCHO, 37(7), 1999, pp. 869-874
Citations number
34
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Psycology,"Neurosciences & Behavoir
Journal title
NEUROPSYCHOLOGIA
ISSN journal
0028-3932 → ACNP
Volume
37
Issue
7
Year of publication
1999
Pages
869 - 874
Database
ISI
SICI code
0028-3932(199906)37:7<869:DLIPWS>2.0.ZU;2-T
Abstract
In order to investigate the relation between situs asymmetry and functional asymmetry of the human brain, a consonant-vowel syllable dichotic listenin g test known as the Standard Dichotic Listening Test (SDLT) was administere d to nine subjects with situs inversus (SI) that ranged in age from 6 to 46 years old (mean of 21.8 years old, S.D. = 15.6); the four males and five f emales all exhibited strong right-handedness. The SDLT was also used to stu dy twenty four age-matched normal subjects that were from 6 to 48 years old (mean 21.7 years old, S.D. = 15.3); the twelve males and twelve females we re all strongly right-handed and served as a control group. Eight out of th e nine subjects (88.9%) with SI more often reproduced the sounds from the r ight ear than sounds from the left ear; this is called right ear advantage (REA). The ratio of REA in the control group was almost the same, i.e., nin eteen out of the twenty-four subjects (79.1%) showed REA. Results of the pr esent study suggest that the left-right reversal in situs inversus does not involve functional asymmetry of the brain. As such, the system that produc es functional asymmetry in the human brain must independently recognize lat erality from situs asymmetry. (C) 1999 Elsevier Science Ltd. All rights res erved.