Auditory intensity processing: Categorization versus comparison
Auditory intensity processing: Categorization versus comparison
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DOI：
10.1016/j.neuroimage.2015.06.074
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发表时间：
2015-10-01
期刊：
影响因子：
5.7
通讯作者：
Brechmann, Andre
中科院分区：
文献类型：
--
作者：
Angenstein, Nicole;Brechmann, Andre
强度是感知复杂听觉刺激（如语音）的重要参数。以往关于强度加工的研究结果不一，有左偏、右偏和非侧化加工。偏侧化对刺激和/或任务类型的明显依赖并不明显。本研究采用功能磁共振成像（fMRI）技术，直接考察了分类任务和比较任务之间的差异。为了确定大脑半球的参与，我们使用了对侧噪声呈现的方法。谐波复合单耳无和对侧噪声。根据其强度的谐波复合物的分类和比较更强烈地涉及左听觉皮层比右听觉皮层表现出更强的额外的噪声对左听觉皮层的活动的影响。与以前的结果一起，这表明听觉皮层中的强度的左侧化处理可以独立于任务和刺激来观察。比较任务比分类任务更强烈地参与左侧听觉皮层，这可能是由于顺序比较的额外需要，而右侧听觉皮层可能是由于容量原因。比较也更强烈地参与与注意力过程相关的区域和负责运动反应选择的区域。我们认为，这是由一个更困难的反应选择和需要不断更新的信息在参考记忆中的比较任务。(C)2015 Elsevier Inc. All rights reserved.
Intensity is an important parameter for the perception of complex auditory stimuli like speech. The results of previous studies on the processing of intensity are diverse since left-lateralized, right-lateralized and non-lateralized processing was suggested. A clear dependence of the lateralization on the kind of stimuli and/or task is not apparent. With the present functional magnetic resonance imaging (fMRI) study, we directly investigated the differences between a categorical and comparative task. To determine hemispheric involvement we used a method with contralateral noise presentation. Harmonic complexes were presented monaurally without and with contralateral noise. Both categorization and comparison of harmonic complexes according to their intensity more strongly involved the left than the right auditory cortex shown by a stronger effect of the additional noise on the activity in the left auditory cortex. Together with previous results, this suggests that left-lateralized processing of intensity in the auditory cortex can be observed independent of task and stimuli. The comparison task more strongly engaged the left auditory cortex than the categorization task probably due the additional need for sequential comparison and the right auditory cortex probably due to capacity reasons. Comparison also more strongly engaged areas associated with attentional processes and areas responsible for motor response selection. We suggest this to be caused by a more difficult response selection and by the need for continuous update of information in reference memory during the comparison task. (C) 2015 Elsevier Inc. All rights reserved.