KMID : 1100220230220040148
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Dementia and Neurocognitive Disorders 2023 Volume.22 No. 4 p.148 ~ p.157
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Time Perception and Memory in Mild Cognitive Impairment and Alzheimer¡¯s Disease: A Preliminary Study
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Woo Sung-Ho
Hahm Ja-Rang Kyong Jeong-Sug Kim Hang-Rai Kim Kwang-Ki
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Abstract
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Background and Purpose: Episodic memory is a system that receives and stores information about temporally dated episodes and their interrelations. Our study aimed to investigate the relevance of episodic memory to time perception, with a specific focus on simultaneity/ order judgment.
Methods: Experiment 1 employed the simultaneity judgment task to discern differences in time perception between patients with mild cognitive impairment or dementia, and agematched normals. A mathematical analysis capable of estimating subjects¡¯ time processing was utilized to identify the sensory and decisional components of temporal order and
simultaneity judgment. Experiment 2 examined how differences in temporal perception relate to performance in temporal order memory, in which time delays play a critical role.
Results: The temporal decision windows for both temporal order and simultaneity ju dgments exhibited marginal differences between patients with episodic memory impairment, and their healthy counterparts (p = 0.15, t(22) = 1.34). These temporal decision windows may be linked to the temporal separation of events in episodic memory (Pearson¡¯s ¥ñ
= ?0.53, p = 0.05).
Conclusions: Based on our findings, the frequency of visual events accumulated and encoded in the working memory system in the patients¡¯ and normal group appears to be approximately (5.7 and 11.2) Hz, respectively. According to the internal clock model, a lower frequency of event pulses tends to result in underestimation of event duration, which
phenomenon might be linked to the observed time distortions in patients with dementia.
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KEYWORD
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Dementia, Time Perception, Memory, Episodic, Alzheimer Disease, Models, Statistical, Memory Disorders
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