Separating Intra-Modal and Across-Modal Training Effects in Visual Working Memory: An fMRI Investigation
Separating Intra-Modal and Across-Modal Training Effects in Visual Working Memory: An fMRI Investigation
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DOI：
10.1093/cercor/bhr037
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发表时间：
2011-11-01
期刊：
影响因子：
3.7
通讯作者：
Mecklinger, Axel
中科院分区：
文献类型：
--
作者：
Schneiders, Julia A.;Opitz, Bertram;Mecklinger, Axel
工作记忆训练是研究特定工作记忆加工之间分离的有效工具。虽然目前的模型提出了特定于模态的工作记忆过程之间的区别，据我们所知，没有研究直接检查视觉与听觉工作记忆训练的效果。功能磁共振成像被用来调查视觉工作记忆过程是否可以专门训练，以及这些效果是否可以从跨通道训练效果分离。我们发现，在视觉工作记忆训练后，与听觉训练或视觉2-back任务的无训练相比，明显有更大的训练增益。这些影响伴随着特定的训练相关的减少，在右额中回所产生的视觉训练。同样，视觉和听觉训练导致右侧额中回上级部分和右侧顶后小叶的激活减少。我们推断，组合的影响，导致增加神经效率的内模态（视觉）的过程，一方面和跨模态（一般控制）的过程，另一方面。因此，工作记忆的视觉过程可以专门训练，这些效果可以在功能上与两种工作记忆训练共同的一般控制过程的改变分离。
Working memory training is a useful tool to examine dissociations between specific working memory processes. Although current models propose a distinction between modality-specific working memory processes, to our knowledge no study has directly examined the effects of visual versus auditory working memory training. Functional magnetic resonance imaging was used to investigate whether visual working memory processes can be trained specifically and whether those effects can be separated from across-modal training effects. We found decidedly larger training gains after visual working memory training compared with auditory or no training on a visual 2-back task. These effects were accompanied by specific training-related decreases in the right middle frontal gyrus arising from visual training only. Likewise, visual and auditory training led to decreased activations in the superior portion of the right middle frontal gyrus and the right posterior parietal lobule. We infer that the combination of effects resulted from increased neural efficiency of intra-modal (visual) processes on the one hand and of across-modal (general control) processes on the other hand. Therefore, visual processes of working memory can be trained specifically, and these effects can be functionally dissociated from alterations in general control processes common to both working memory trainings.