<ul data-eligibleForWebStory="false">Brain-computer interfaces (BCIs) can benefit from uncertainty quantification to enhance accuracy in Motor Imagery classification tasks.Research compares uncertainty quantification abilities of established BCI classifiers like CSP-LDA and MDRM against Deep Learning methods.CSP-LDA and MDRM-T provide the best uncertainty estimates, while Deep Ensembles and CNNs excel in classifications for Motor Imagery BCI tasks.Models showcase the ability to differentiate between easy and difficult classifications, enabling improved accuracy by rejecting ambiguous samples.