Extended reality presentations (e.g., augmented reality, augmented virtuality, and virtual reality) are often presented as multimodal experiences involving a combination of visual, audio, and haptic input and output channels. Users who have a deficit in one modality may consume other channels of the extended reality presentation, but the absence of the deficit modality may render the extended reality presentation incomplete or incomprehensible. Instead, for users with a deficit in a source modality, a modality may be identified as an annotation modality in which the user does not have a deficit. An annotation set of annotations in the annotation modality may be generated that respectively describe an event arising in a source channel in the source modality. The annotation set may be presented to the user (either supplementing the source channel or in lieu of the source channel), thereby adapting the extended reality presentation to the physiological capabilities of the user.