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Reduced eye gaze fixation during emotion recognition among patients with temporal lobe epilepsy

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Abstract

Objectives

To investigate the facial scan patterns during emotion recognition (ER) through the dynamic facial expression task and the awareness of social interference test (TASIT) using eye tracking (ET) technology, and to find some ET indicators that can accurately depict the ER process, which is a beneficial supplement to existing ER assessment tools.

Method

Ninety-six patients with TLE and 88 healthy controls (HCs) were recruited. All participants watched the dynamic facial expression task and TASIT including a synchronized eye movement recording and recognized the emotion (anger, disgust, happiness, or sadness). The accuracy of ER was recorded. The first fixation time, first fixation duration, dwell time, and fixation count were selected and analyzed.

Results

TLE patients exhibited ER impairment especially for disgust (Z =  − 3.391; p = 0.001) and sadness (Z =  − 3.145; p = 0.002). TLE patients fixated less on the face, as evidenced by the reduced fixation count (Z =  − 2.549; p = 0.011) of the face and a significant decrease in the fixation count rate (Z =  − 1.993; p = 0.046). During the dynamic facial expression task, TLE patients focused less on the eyes, as evidenced by the decreased first fixation duration (Z =  − 4.322; p = 0.000), dwell time (Z =  − 4.083; p = 0.000), and fixation count (Z =  − 3.699; p = 0.000) of the eyes.

Conclusion

TLE patients had ER impairment, especially regarding negative emotions, which may be attributable to their reduced fixation on the eyes during ER, and the increased fixation on the mouth could be a compensatory effect to improve ER performance. Eye-tracking technology could provide the process indicators of ER, and is a valuable supplement to traditional ER assessment tasks.

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Data availability

Original data can be provided by the corresponding author on demand.

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Acknowledgements

We are very grateful to all the participants in this study. Sincere thanks also go to Professor Yin from Binghamton University and Professor Ye from Fu Jen Catholic University, for providing the dynamic expression task and TASIT. We appreciate Professor Atkinson from Durham University for your body movement stimuli though we do not apply this task to this paper. Thank you to everyone who helped us directly and indirectly.

Funding

This study was supported by National Key Research and Development Program of China (2022YFC2503804), National Natural Science Foundation of China (82071461; 82271503), “From 0 to 1” Original Innovation Project of the Basic Frontier Scientific Research Program of the Chinese Academy of Sciences (29J20-015-III), and the Natural Science Foundation of Hunan Province, China (2023JJ30939).

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Authors and Affiliations

Authors

Contributions

Kailing Huang, Qiong Zhang, Haojun Yang, and Shirui Wen contributed to the acquisition of data and drafting of the manuscript for content and interpretation of data, Ziwei Tian contributed to the programming of the experimental paradigm; Jie Feng and Weiting Tang contributed to the conceptualization and study design; Li Feng contributed to study design and revision of manuscript. Quan Wang contributed to study design and data analysis.

Corresponding authors

Correspondence to Quan Wang or Li Feng.

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The authors declare no competing financial interests.

Ethical approval

The studies involving human participants were reviewed and approved by the Ethics Committee of Xiangya Hospital of Central South University. The patients/participants provided their written informed consent to participate in this study.

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Huang, K., Tian, Z., Zhang, Q. et al. Reduced eye gaze fixation during emotion recognition among patients with temporal lobe epilepsy. J Neurol 271, 2560–2572 (2024). https://doi.org/10.1007/s00415-024-12202-w

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  • DOI: https://doi.org/10.1007/s00415-024-12202-w

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