Techniques for conditional presentation of auxiliary information are provided. In one example, a computer-implemented method comprises determining, by a device operatively coupled to a processor, feedback information for a user in response to a media presentation, wherein the feedback information is indicative of a mental state of the user during presentation of the media presentation. The computer-implemented method can further comprise determining content of the media presentation associated with the mental state of the user, and determining auxiliary information about the content based on the mental state of the user. The computer-implemented method can further comprise providing, by the device, the content to a user device during the presentation of the media presentation and for rendering at the user device in association with presentation of the content.