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首页> 外文期刊>The European Journal of Neuroscience >Prefrontal cortical involvement in verbal encoding strategies.
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Prefrontal cortical involvement in verbal encoding strategies.

机译：前额叶皮层参与言语编码策略。

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摘要

The lateral prefrontal cortex is critical for the control and organization of information in working memory. In certain situations, effective reorganization can attenuate task difficulty, suggesting a dissociation between lateral prefrontal activity and basic memory demand. In a verbal working memory task, we investigated the enhancement of performance that occurs when incoming information can be reorganized into higher-level groups or chunks. In the fMRI scanner, volunteers heard and repeated a sequence of digits. Mathematically structured sequences, encouraging 'chunking', were compared with unstructured, random sequences. Though structured sequences were easier to remember, fMRI showed increased lateral prefrontal activation for these sequences. Specifically, both the dorsolateral and ventrolateral prefrontal cortices were activated preferentially for the structured sequences during encoding. When visual stimuli that can be chunked using spatial structure are used, similar results are observed. These results demonstrate that cognitively less demanding tasks may elicit greater lateral prefrontal recruitment. Thus, the lateral prefrontal cortex appears to play a general role in strategically recoding information from memory, in order to optimize performance.
机译：外侧前额叶皮层对于控制和组织工作记忆中的信息至关重要。在某些情况下，有效的重组可以减轻任务的难度，表明横向前额叶活动与基本记忆需求之间没有联系。在一项口头工作记忆任务中，我们研究了当传入的信息可以重组为更高级别的组或块时，性能的提高。在功能磁共振成像扫描仪中，志愿者听到并重复了一系列数字。将鼓励“分块”的数学结构化序列与非结构化随机序列进行了比较。尽管结构化序列更容易记忆，但fMRI显示这些序列的侧前额叶激活增加。具体而言，在编码过程中，背侧和腹侧前额叶皮层皮质结构序列均优先被激活。当使用可以使用空间结构分割的视觉刺激时，观察到相似的结果。这些结果表明，认知上要求较低的任务可能会引起更大的前额外侧前额募集。因此，外侧前额叶皮层似乎在策略性地重新编码来自内存的信息中起着普遍作用，以优化性能。

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