Using the spectrum of the ECG is a non-starter unless the ECGs fed to the DL algorithm (after the model is trained) for detecting the personality traits are obt

Using the spectrum of the ECG is a non-starter unless the ECGs fed to the DL algorithm (after the model is trained) for detecting the personality traits are obtained under the same conditions of the original datasets (while watching a short video, sitting on a chair, etc.) The spectral content of the ECGs will change depending on the heart rate. So if you run the DL model using an ECG collected while the subject was, say, running will generate completely bogus results.