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首页> 外文期刊>Brain research >Task-related laterality effects in the lateral occipital complex.
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Task-related laterality effects in the lateral occipital complex.

机译：枕骨外侧复合体中与任务相关的侧面效应。

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摘要

Using functional imaging, we investigated the effects of two different tasks on activation in the lateral occipital complex (LOC). Alternating blocks of intact and scrambled objects were presented. In one task, subjects responded when an object repeated (matching task). In a second task subjects silently named objects (naming task). Identical objects (tools, animals and letters) were presented for both tasks. A relative measure of the number of voxels activated in LOC in left and right hemispheres was calculated for each task across a range of thresholds. Also the effects of task demands on category specific areas in LOC were examined. The object matching task resulted in proportionally more activity in the right hemisphere. The object naming task resulted in proportionally more activity in the left hemisphere, most prominently in the anterior portion of LOC. Effectively, changing the task changed the lateralization of activation to intact objects in LOC. In contrast, changing the task did not change the lateralization of category-specific activations. The results suggest that there are task-related top-down influences on the activation of neural populations in LOC as a whole, but the lateralization of category-specific regions in LOC is independent of task demands and may reflect bottom-up processing.
机译：使用功能成像，我们调查了两个不同任务对外侧枕骨复合体（LOC）激活的影响。完整和混乱的对象的交替块被介绍。在一项任务中，对象在对象重复时做出响应（匹配任务）。在第二个任务中，主题以静默方式命名对象（命名任务）。提出了两个任务相同的对象（工具，动物和字母）。计算每个任务在一定阈值范围内在左半球和右半球在LOC中激活的体素数量的相对度量。还检查了任务要求对LOC中特定类别区域的影响。对象匹配任务导致右半球成比例地更多活动。对象命名任务导致左半球的活动成比例增加，最明显的是在LOC的前部。有效地，更改任务将激活的横向化更改为LOC中完整的对象。相反，更改任务不会更改类别特定激活的横向化。结果表明，与任务相关的自上而下的影响对整个LOC中的神经种群的激活有影响，但是LOC中特定类别区域的侧向化与任务需求无关，并且可能反映了自下而上的过程。

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