Centro de Investigación Avanzada en Educación, CIAE, Universidad de Chile, 8330014 Santiago, Chile.
Neurosci Lett. 2014 May 1;567:40-4. doi: 10.1016/j.neulet.2014.03.021. Epub 2014 Mar 26.
Adults use different processing strategies to work with fractions. Depending on task requirements, they may analyze the fraction components separately (componential processing strategy, CPS) or consider the fraction as a whole (holistic processing strategy, HPS). It is so far unknown what is the brain coordination dynamics underlying these types of fraction processing strategies. To elucidate this issue, we analyzed oscillatory brain activity during a fraction comparison task, presenting pairs of fractions either with or without common components. Results show that CPS induces a left frontal-parietal alpha phase desynchronization after the onset of fraction pairs, while HPS induces an increase of phase synchrony on theta and gamma bands, over frontal and central-parietal sites, respectively. Additionally, the HPS evokes more negative ERPs around 400 ms over the right frontal scalp than the CPS. This ERP activity correlates with the increase of Theta phase synchrony. Our results reveal the emergence of different functional neural networks depending on the kind of cognitive strategy used for processing fractions.
成年人使用不同的处理策略来处理分数。根据任务要求，他们可以分别分析分数的组成部分（成分处理策略，CPS），或者将分数作为一个整体来考虑（整体处理策略，HPS）。目前尚不清楚这些分数处理策略背后的大脑协调动力学是什么。为了解决这个问题，我们在分数比较任务中分析了振荡脑活动，呈现了具有或不具有共同成分的分数对。结果表明，CPS 在分数对出现后诱导左额顶叶的α 相去同步，而 HPS 分别在额和中央顶叶区域上诱导θ和γ频段的相位同步增加。此外，HPS 在右额头皮上引发的 ERPs 在 400ms 左右比 CPS 更负。这种 ERP 活动与θ相同步的增加相关。我们的结果表明，根据用于处理分数的认知策略的类型，出现了不同的功能神经网络。
