Abstract
The posterior medial parietal cortex and left prefrontal cortex (PFC) have both been implicated in the recollection of past episodes. In a previous study, we found the posterior precuneus and left lateral inferior frontal cortex to be activated during episodic source memory retrieval. This study further examines the role of posterior precuneal and left prefrontal activation during episodic source memory retrieval using a similar source memory paradigm but with longer latency between encoding and retrieval. Our results suggest that both the precuneus and the left inferior PFC are important for regeneration of rich episodic contextual associations and that the precuneus activates in tandem with the left inferior PFC during correct source retrieval. Further, results suggest that the left ventro-lateral frontal region/frontal operculum is involved in searching for task-relevant information (BA 47) and subsequent monitoring or scrutiny (BA 44/45) while regions in the dorsal inferior frontal cortex are important for information selection (BA 45/46).
Highlights
Human memory that is important for encoding and retrieving declarative information has been fractionated into working, semantic, and episodic memory (e.g., Eichenbaum and Cohen, 2001; Schacter and Tulving, 1994)
The primary purpose of this study is to further examine posterior precuneal and left prefrontal activation during episodic source memory retrieval in order to suggest more specific roles for the posterior precuneus and left prefrontal cortex (PFC)
Results suggest that the left ventrolateral frontal region/frontal operculum (BA 47) is involved in information integration while regions in the dorsal inferior frontal cortex are important for information selection and monitoring
Summary
Human memory that is important for encoding and retrieving declarative information has been fractionated into working, semantic, and episodic memory (e.g., Eichenbaum and Cohen, 2001; Schacter and Tulving, 1994). Source memory tasks have commonly been employed to study episodic memory in neuroimaging (e.g., Rugg and Henson, 2002). Recognition memory can be thought of as comprising at least two processes, recollection and familiarity (e.g., Kelley and Jacoby, 2000; Mandler, 1980; Yonelinas et al, 1996). Cues within a task that elicit different kinds of correct answers would have different orientations, such as between item recognition vs source memory judgments or cues relating to previously encoded pictures vs words. Retrieval success relates to the recovery of previously encoded information, while effort relates to task difficulty and is usually assessed by accuracy or reaction times
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