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2014 ; 113
(ä): 165-73
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Human fear extinction and return of fear using reconsolidation update mechanisms:
the contribution of on-line expectancy ratings
#MMPMID24183839
Warren VT
; Anderson KM
; Kwon C
; Bosshardt L
; Jovanovic T
; Bradley B
; Norrholm SD
Neurobiol Learn Mem
2014[Sep]; 113
(ä): 165-73
PMID24183839
show ga
Disruption of the reconsolidation of conditioned fear memories has been suggested
as a non-pharmacological means of preventing the return of learned fear in human
populations. A reconsolidation update paradigm was developed in which a
reconsolidation window is opened by a single isolated retrieval trial of a
previously reinforced CS+ which is then followed by Extinction Training within
that window. However, follow-up studies in humans using multi-methods fear
conditioning indices (e.g., fear-potentiated startle, skin conductance,
US-expectancy) have failed to replicate the retrieval+extinction effects. In the
present study, we further investigated the retrieval+extinction reconsolidation
update paradigm by directly comparing the acquisition, extinction, and return of
fear-potentiated startle in the absence or presence of US-expectancy measures
(using a trial-by-trial response keypad) with and without retrieval of a
previously acquired CS-US association. Participants were fear conditioned to two
visual cue CS+'s, one of which was presented as a single, isolated retrieval
trial before Extinction Training and one that was extinguished as usual. The
results show that the inclusion of US-expectancy measures strengthens the CS-US
association to provide enhanced fear conditioning and maintenance of fear
memories over the experimental sessions. In addition, in the groups that used
on-line US-expectancy measures, the retrieval+extinction procedure reduced
reinstatement of fear-potentiated startle to both previously reinforced CS+'s, as
compared to the extinction as usual group.