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A Machine Learning Approach to Design an Efficient Selective Screening of Mild Cognitive Impairment
Published on: January 11, 2020
Quantifying generalization error in machine learning prediction of cognitive decline
Roya Melanie Hüppi1, Nicolas Langer2, Bruno Hebling Vieira2
1Methods of Plasticity Research, Department of Psychology, University of Zurich, 8050, Zurich, Zurich, Switzerland; Neuroscience Center Zurich (ZNZ), University of Zurich & ETH Zurich, 8057, Zurich, Zurich, Switzerland; Department of Adult Psychiatry and Psychotherapy, Psychiatric University Clinic Zurich and University of Zurich, 8032, Zurich, Zurich, Switzerland.
Adding structural MRI data significantly improves machine learning predictions of cognitive decline. While generalizability across datasets is reduced, this enhances precision medicine for early intervention.
Area of Science:
- Neuroimaging
- Machine Learning
- Cognitive Decline
Background:
- Predicting cognitive decline continuum (healthy aging, MCI, dementia) enables precise predictions.
- Generalizability of predictive models to independent cohorts is crucial for clinical utility but often unevaluated.
Purpose of the Study:
- To assess if structural MRI data improves machine learning predictions of continuous cognitive decline.
- To analyze the generalizability of these predictive models across independent datasets.
Main Methods:
- Multi-target random forest regression models were used to predict annual changes in CDR-SOB and MMSE scores.
- Models utilized non-brain data, structural MRI data, or a combination from ADNI and OASIS-3 datasets.
- Cross-site generalizability was evaluated.
Main Results:
- Structural MRI data inclusion improved prediction accuracy (R² of .41/.33 for CDR-SOB/MMSE in ADNI; .42/.33 in OASIS-3).
- Cross-dataset prediction performance decreased (R² between .18 and .35).
- Models using top predictive features showed similar external performance to full models, indicating redundancy.
Conclusions:
- Structural MRI enhances within-dataset prediction of cognitive decline, supporting precision medicine.
- Quantifying the generalizability gap is vital for responsible clinical application of ML models.
- External validation remains a challenge but is essential for reliable clinical translation.
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