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Different Temporal Patterns of Specific and General Autobiographical Memories across the Lifespan in Alzheimers Disease

机译:阿尔茨海默氏病整个生命周期中特定和一般自传体记忆的不同时间模式

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摘要

We compared specific (i.e., associated with a unique time and space) and general (i.e., extended or repeated events) autobiographical memories (AbM) in Alzheimer's disease (AD). The comparison aims at investigating the relationship between these two components of AbM across the lifespan and the volume of cerebral regions of interest within the temporal lobe. We hypothesized that the ability to elicit specific memories would correlate with hippocampal volume, whereas evoking general memories would be related to lateral temporal lobe. AbM was assessed using the modified Crovitz test in 18 patients with early AD and 18 matched controls. The proportions of total memories—supposed to reflect the ability to produce general memories—and specific memories retrieved were compared between AD patients and controls. Correlations to MRI volumes of temporal cortex were tested. We found different temporal patterns for specific and general memories in AD patients, with (i) relatively spared general memories, according to a temporal gradient that preserved remote memories, predominantly associated with right lateral temporal cortex volume. (ii) Conversely, the retrieval of specific AbMs was impaired for all life periods and correlated with bilateral hippocampal volumes. Our results highlight a shift from an initially episodic to a semantic nature of AbMs during AD, where the abstracted form of memories remains.
机译:我们比较了阿尔茨海默氏病(AD)的特定自传体记忆(AbM)和一般性自传体记忆(AbM)(即与唯一的时间和空间相关联)。比较的目的是调查整个生命周期中AbM的这两个组成部分与颞叶内感兴趣的大脑区域的体积之间的关系。我们假设,引起特定记忆的能力与海马体积相关,而引起一般记忆与外侧颞叶相关。使用改良的Crovitz检验评估了18例AD早期患者和18例匹配对照者的AbM。在AD患者和对照组之间比较了总记忆的比例(据推测反映了产生一般记忆的能力)和检索到的特定记忆。测试与颞叶皮质MRI体积的相关性。我们发现,根据保留远程记忆的时间梯度(主要与右侧颞叶皮层体积相关),AD患者的特定和一般记忆具有不同的时间模式,其中(i)相对空闲的一般记忆。 (ii)相反,在整个生命周期中特定AbM的检索均受到损害,并且与双侧海马体积相关。我们的研究结果突显了在AD时期AbM从最初的情节转变为语义性质的转变,其中记忆的抽象形式仍然存在。

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