Dissociation between memory accuracy and memory confidence following bilateral parietal lesions.
Dissociation between memory accuracy and memory confidence following bilateral parietal lesions.
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DOI：
10.1093/cercor/bhp116
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发表时间：
2010-02
期刊：
影响因子：
--
通讯作者：
Olson IR
中科院分区：
文献类型：
--
作者：
Simons JS;Peers PV;Mazuz YS;Berryhill ME;Olson IR
许多功能性神经影像学研究已经观察到侧顶叶在记忆任务中的激活：这对传统上将顶叶与空间注意力而不是记忆联系起来的临床医生来说是一个惊喜。最近的神经心理学研究检查顶叶损伤后的情景回忆报道了不同的结果。表现保留在单侧病变患者源记忆任务，涉及回忆的刺激遇到的背景下，和受损的任务评估自由回忆自传体记忆的患者与双侧顶叶病变。在这里，我们调查了这些不同结果的一些可能的解释。在3个实验中，双侧顶叶病变的患者以及控制源回忆，证实了以前的单侧病变的结果，并反对对这些结果的解释，在contralesional补偿。减少记忆信息的行为相关性的关键源回忆任务并没有影响性能的双边病变患者，表明先前观察到的减少自传体自由回忆可能不是由于受损的自下而上的注意。然而，在3项实验中，双侧患者确实表现出对其来源回忆能力的信心下降，这与顶叶病变可能导致丰富情景回忆的主观体验受损的建议一致。
Numerous functional neuroimaging studies have observed lateral parietal lobe activation during memory tasks: a surprise to clinicians who have traditionally associated the parietal lobe with spatial attention rather than memory. Recent neuropsychological studies examining episodic recollection after parietal lobe lesions have reported differing results. Performance was preserved in unilateral lesion patients on source memory tasks involving recollecting the context in which stimuli were encountered, and impaired in patients with bilateral parietal lesions on tasks assessing free recall of autobiographical memories. Here, we investigated a number of possible accounts for these differing results. In 3 experiments, patients with bilateral parietal lesions performed as well as controls at source recollection, confirming the previous unilateral lesion results and arguing against an explanation for those results in terms of contralesional compensation. Reducing the behavioral relevance of mnemonic information critical to the source recollection task did not affect performance of the bilateral lesion patients, indicating that the previously observed reduced autobiographical free recall might not be due to impaired bottom-up attention. The bilateral patients did, however, exhibit reduced confidence in their source recollection abilities across the 3 experiments, consistent with a suggestion that parietal lobe lesions might lead to impaired subjective experience of rich episodic recollection.
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