Recency discrimination has been conceptualized as an executive ability
by some investigators and as an aspect of episodic memory by others. We
compared the performance of 261 neurologically healthy adults on a recency
discrimination task (RDT) with their performance on measures of executive
functioning and explicit memory. Mean z-transformed raw scores
were used to construct indices of visual and verbal explicit memory,
fluency, and executive functioning. Analyses revealed that RDT performance
correlated more closely with visual (r = 0.32; p <
0.001) and verbal memory (r = 0.25; p < 0.001) than
with fluency (r = 0.16; p < 0.05) and executive
functioning (r = 0.13; p < 0.05). These findings
suggest that recency discrimination might be better understood as an
aspect of episodic memory that is subserved primarily by hippocampal and
medial temporal structures than as an executive function that is subserved
primarily by prefrontal cortex. (JINS, 2007, 13,
710–715.)