Abstract: Although studies on feeling-of-knowing (FOK) generally assume it is a continuum that varies from weak to strong, recent neuroimaging studies indicated FOK and feeling-of-not-knowing (FOnK) involved different neural networks. This suggested FOK and FOnK might be supported by distinct cognitive brain processes and implied a dual-process model of FOK. In this paper, some theoretical aspects of this model were considered. Different from the accessibility model that postulated FOK relied on the accessibility of retrieved information, dual-process model proposed the accessible information were to be evaluated and discriminated by metamemory mechanism. The task-related part of the information was accepted and taken in the metamemory prediction, constituting the positive FOK, whereas the task-unrelated part of the information was rejected and excluded from the metamemory prediction, constituting the negative FOnK. The behavioral evidences that supported the dual-process model were also discussed

Key words: metamemory, feeling-of-knowing (FOK), feeling-of-not-knowing (FOnK)