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| Research | Method | Limitation |
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| P. Maruff, Y. Y Lim, D. Darby, et al. [23] | Novel method for rapid assessment of cognitive impairment using high-performance eye tracking technology | To assess by staring at still images, with long time consumption, not activating the human-computer interactive scene, lacking dynamic follow-up of eye movement in real time under time sequence, not realizing the automatic test function |
| A. Oyama, S. Takeda, Y. Ito, T. Nakajima, et al. [24] | Through the functional assessment from visuospatial memory ability realizing MCI early warning |
| R. U. Haque, C. M. Manzanares, L. N. Brown, et al. [19] | Through the assessment from visuospatial learning ability and memory defect for MCI early warning |
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| E. Bartoli, F. Caso, G. Magnani, and G. Baud-Bovy [20]. | Using robot to control and move the patient’s arm to complete a test and analyzing the visuospatial ability of MCI patients through the recorded trajectory and eye movement data | The operation is difficult for the elderly and takes long time |
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| I. E. Plattner, L. Mbakile-Mahlanza, S. Marobela, et al [21] | Screening cognitive impairment through three cognitive domains: information processing speed, working memory, and executive function | Long time consumption |
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| R. F. Buckley, K. P. Sparks, K. V. Papp [7] | Using image stimulation from the perspective of episodic memory for nonclinical AD | The main function is to assist in the diagnosis and judge the progress and severity of AD, and the early warning efficiency of MCI is low |
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