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2014 ; 26
(10
): 2385-99
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The neural basis of involuntary episodic memories
#MMPMID24702453
Hall SA
; Rubin DC
; Miles A
; Davis SW
; Wing EA
; Cabeza R
; Berntsen D
J Cogn Neurosci
2014[Oct]; 26
(10
): 2385-99
PMID24702453
show ga
Voluntary episodic memories require an intentional memory search, whereas
involuntary episodic memories come to mind spontaneously without conscious
effort. Cognitive neuroscience has largely focused on voluntary memory, leaving
the neural mechanisms of involuntary memory largely unknown. We hypothesized
that, because the main difference between voluntary and involuntary memory is the
controlled retrieval processes required by the former, there would be greater
frontal activity for voluntary than involuntary memories. Conversely, we
predicted that other components of the episodic retrieval network would be
similarly engaged in the two types of memory. During encoding, all participants
heard sounds, half paired with pictures of complex scenes and half presented
alone. During retrieval, paired and unpaired sounds were presented, panned to the
left or to the right. Participants in the involuntary group were instructed to
indicate the spatial location of the sound, whereas participants in the voluntary
group were asked to additionally recall the pictures that had been paired with
the sounds. All participants reported the incidence of their memories in a
postscan session. Consistent with our predictions, voluntary memories elicited
greater activity in dorsal frontal regions than involuntary memories, whereas
other components of the retrieval network, including medial-temporal, ventral
occipitotemporal, and ventral parietal regions were similarly engaged by both
types of memories. These results clarify the distinct role of dorsal frontal and
ventral occipitotemporal regions in predicting strategic retrieval and recalled
information, respectively, and suggest that, although there are neural
differences in retrieval, involuntary memories share neural components with
established voluntary memory systems.
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