SOUND LOCALIZATION IN HEMISPHERECTOMIZED PATIENTS

被引:41
作者
POIRIER, P
LASSONDE, M
VILLEMURE, JG
GEOFFROY, G
LEPORE, F
机构
[1] UNIV MONTREAL,DEPT PSYCHOL,RECH NEUROPSYCHOL EXPTL GRP,MONTREAL H3C 3J7,PQ,CANADA
[2] MONTREAL NEUROL HOSP & INST,DEPT NEUROSURG,MONTREAL H3A 2B4,PQ,CANADA
[3] HOP ST JUSTINE,DEPT NEUROL,MONTREAL H3T 1C5,PQ,CANADA
基金
加拿大自然科学与工程研究理事会;
关键词
D O I
10.1016/0028-3932(94)90143-0
中图分类号
B84 [心理学]; C [社会科学总论]; Q98 [人类学];
学科分类号
03 ; 0303 ; 030303 ; 04 ; 0402 ;
摘要
In order to precisely evaluate the consequences of cortical damage on free-field sound localization in humans, the present study examined response accuracy to auditory targets in three hemispherectomized patients and IQ-matched controls. Listeners reported sound location by pointing with their dominant hand to the apparent sound location in an anechoic chamber. Two conditions were tested: (i) localization of a fixed-sound source and (ii) localization of the beginning and the end of a simulated moving stimulus. In both conditions, the responses of the patients were less accurate than those of the controls in the hemifield contralateral to their removed hemisphere. Moreover, the single-case analyses revealed that the performances obtained with fixed sources were generally more precise than those obtained with moving sources. This result is discussed in terms of a differential involvement of cortical and subcortical pathways in the processing of stationary and moving sounds. Finally, the age at surgery and the post-surgical interval were related with the magnitude of the deficits, suggesting the possible influences of functional reorganization and cerebral plasticity.
引用
收藏
页码:541 / 553
页数:13
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