Tiitinen H, Palomäki K J, Mäkinen V, May P J C, Alku P
Apperception and Cortical Dynamics, Department of Psychology, University of Helsinki, Finland.
Neurol Clin Neurophysiol. 2004 Nov 30;2004:50.
We studied the cortical processing of spatial stimuli by magnetoencephalographic (MEG) measurements using broadband noise bursts presented from eight sound source directions in the horizontal plane. The stimuli were individually created for each subject by using three-dimensional (3D) sound techniques. The subjects carried out a behavioral task where their accuracy for localizing the 3D stimuli was established. We found that the auditory N100m response was sensitive to the sound source direction, exhibiting contralaterally more preponderant responses in both the left and the right hemisphere. Generally, responses were more prominent in the right hemisphere. The behavioral performance of the subjects correlated positively with N100m amplitude organization, showing that the dynamics of auditory cortex predict behavioral sound detection.
我们通过脑磁图（MEG）测量研究了空间刺激的皮质处理过程，使用在水平面内从八个声源方向呈现的宽带噪声脉冲。通过三维（3D）声音技术为每个受试者单独创建刺激。受试者执行一项行为任务，在此任务中确定了他们对3D刺激进行定位的准确性。我们发现听觉N100m反应对声源方向敏感，在左半球和右半球均表现出对侧更占优势的反应。一般来说，右半球的反应更明显。受试者的行为表现与N100m振幅组织呈正相关，表明听觉皮层的动力学可预测行为声音检测。
