The perceptual wink model of Rusconi and Huber (2018) assumes that the Attentional Blink (AB) is a perceptual deficit, reflecting a failure to perceive that the second target belongs to the target category. Providing a unified account of the AB and Repetition Blindness (RB), we augmented the perceptual wink model with a Bayesian decision process that compares the accumulated evidence in short-term memory against expected levels to determine how many times a particular identity appeared. Notably, this unified explanation of the AB and RB does not require type-token binding; in lieu of tokenization, performance is based on the magnitude of evidence for each type. Chun (1997) examined repetition blindness (RB) in a letter-number attentional blink (AB) task, finding that some manipulations selectively reduced the AB while others selectively reduced the RB. However, perceptual habituation can explain these dissociations considering that in an RSVP paradigm, the RB entails both a deficit for a character’s visual appearance and identity (i.e., which letter or number?) as well as a deficit for the target category (i.e., is it a number or a letter?). We assessed the unified model with the paradigm of Chun (1997) across three experiments, while manipulating the category mapping; for each experiment, one group of subjects received consistent mapping, with a set of characters consistently assigned to the target category, while another group received varied mapping, with variation across trials for the target category. As predicted, the category mapping manipulation affected RB and the AB in a similar manner. Multiple-choice testing was used to confirm the prediction that in the midst of both the AB and RB, participants would claim that the trial only contained one target, as expected if both deficits reflect a failure to perceive that the second target belonged to the target category.