Effects of divided attention on temporal processing in patients with lesions of the cerebellum or frontal lobe
Effects of divided attention on temporal processing in patients with lesions of the cerebellum or frontal lobe
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DOI：
10.1037/0894-4105.13.1.10
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发表时间：
1999-01-01
期刊：
影响因子：
2.4
通讯作者：
Ivry, RB
中科院分区：
文献类型：
--
作者：
Casini, L;Ivry, RB
前额叶皮层和小脑都参与了时间处理任务，尽管每个系统的确切贡献还不清楚。为了探讨这个问题，对照组和患者无论是前额叶或小脑病变进行了测试的时间和非时间知觉任务下的2个水平的注意力负荷。每次试验都涉及标准音调和随后的比较音调之间的比较，这些音调在频率，持续时间或两者上都有变化。当参与者必须同时在两个维度上做出判断时，额叶病变患者在两项任务上均显着受损，而小脑患者的变异性仅在持续时间任务中增加。这种分离表明，在额叶患者中观察到的时间处理任务的缺陷可能与这些任务的注意力需求有关;小脑患者有一个更具体的问题与时间有关。
Prefrontal cortex and cerebellum have both been implicated in temporal processing tasks although the exact contribution of each system remains unclear. To investigate this issue, control participants and patients with either prefrontal or cerebellar lesions were tested on temporal and nontemporal perceptual tasks under 2 levels of attentional load. Each trial involved a comparison between a standard tone and a subsequent comparison tone that varied in frequency, duration, or both. When participants had to make concurrent judgments on both dimensions, patients with frontal lobe lesions were significantly impaired on both tasks whereas the variability of cerebellar patients increased in the duration task only. This dissociation suggests that deficits on temporal processing tasks observed in frontal patients can be related to the attention demands of such tasks; cerebellar patients have a more specific problem related to timing.