One or more embodiments of the present disclosure involve training and utilizing a recall machine learning model to predict recall lift on a per-user basis with respect to digital content items. For example, systems described herein train a recall machine learning model based on poll responses from exposed users and non-exposed users with regard to sample digital content. In particular, the systems described herein train the recall machine learning model to output recall lift scores for a target user based on an assumption that the target user has been exposed to digital content and an assumption that the target user has not been exposed to the digital content. The systems described herein further involve delivering digital content in accordance with the recall lift score.
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