Perceptual identification task points to continuity between implicit memory and recall

Adopting a continuous identification task (CID-R) with embedded questions about prior occurrence, recent research has proposed that implicit and explicit memory are underpinned by a single memory system, since there is a systematic relationship between implicit memory (measured by identification) and explicit memory (measured by subjective report of recognition; for an example, see Berry, Shanks, & Henson, 2008). We were interested in whether this pattern would extend to recall of information from a study phase (Experiment 1) or recall from semantic memory (Experiment 2). We developed a degraded face identification version of the CID-R task using Gaussian blur. We reproduced previous results regarding the relationship between explicit responses on the recognition task (old/new) and stimuli identification, pointing to a continuity between explicit and implicit memory. Critically, we also found that the strength of the implicit effect (i.e., stimuli identification) was predicted by the accuracy in recall (retrieval of context in Experiment 1 and correct responses to general knowledge questions about the face in Experiment 2). Our results support the idea that memory is unidimensional and related to memory trace strength; both for recall and recognition, and interestingly, for semantic and episodic recall.