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Distorted time perception in patients with transient global amnesia: time perception task and imaging analysis

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Abstract

Introduction

Transient global amnesia (TGA) is defined as a sudden and transient episode of memory loss and accompanied by temporal disorientation. However, the mechanism by which time distortion occurs is not clearly elucidated yet.

Methods

Between March 2019 and November 2020, we subjected 30 TGA patients to several time perception tasks and analyzed their magnetic resonance image (MRI) scans and compared the results with age- and sex-matched control group.

Results

Among the 60 recruited subjects (64.5 ± 6.3 years), 70% were women. Fourteen patients had only anterograde amnesia. Furthermore, 46% of the patients with TGA (n = 14) had a history of Valsalva maneuver, and 70% of the patients (n = 21) had a pre-attack stress factor. The MRI scans of 14 patients (46.67%) showed hippocampal hyperintensity. With regard to the time production task, patients with TGA exhibited shorter times in all trials compared with their counterparts (5 s, 4.90 ± 1.16 vs. 5.53 ± 0.87; p value = 0.02: 15 s, 12.18 ± 4.55 vs. 14.42 ± 2.54; p value = 0.021). For the time comparison task, the number of correct answers given by patients with TGA was significantly lesser than that given by the control group (6.07 ± 1.23 vs. 6.90 ± 1.24; p value = 0.006).

Conclusions

This is the first study to invesgating an altered time perception in patients with TGA. Although the exact neurophysiological mechanism remains unclear, our findings could aid in the elucidation of brain function across specific time frames.

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Data availability

The datasets used and analyzed during the current study are available from the corresponding author on reasonable request.

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Funding

This work was supported by the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Science and ICT (NRF-2018R1C1B5086320); a grant no. 2020–07 from the Kangdong Sacred Heart Hospital Fund; the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No.2021R1G1A1012083).

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Authors and Affiliations

Authors

Contributions

YK: study concept and design, data analysis and interpretation, drafting of the manuscript, and review of the results. JK: data analysis and interpretation, drafting of the manuscript, and review of the results.

Corresponding author

Correspondence to Yerim Kim.

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Conflict of interest

The authors declare no competing interests.

Informed consent

Written informed consent was obtained from all participants or from the next of kin when the patient’s agreement was not possible.

Ethical approval

The study was conducted according to the guidelines of the Declaration of Helsinki and approved by the Institutional Review Board from Kangdong Sacred Heart Hospital (IRB no. 2020–10-011).

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Kim, J., Kim, Y. Distorted time perception in patients with transient global amnesia: time perception task and imaging analysis. Neurol Sci 43, 5951–5958 (2022). https://doi.org/10.1007/s10072-022-06219-0

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  • DOI: https://doi.org/10.1007/s10072-022-06219-0

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