We present a model of visual working memory in ventral prefrontal cortex. Activation in ventral PFC consists of reverberating activity. Representations in ventral PFC are conjunctions of location and (partial) identity representations. With many objects, representations in ventral PFC interfere, which results in loss of information. Therefore, the number of objects in working memory is limited. However, because ventral PFC is connected to the ‘identity’ levels in the visual cortex, the number of features for each object is unlimited. The ‘blackboard’ architecture of ventral PFC results in a uni4cation (binding) of the feature representations of the objects maintained in memory. c © 2003 Elsevier Science B.V. All rights reserved.