TY  - JOUR
A1  - Kizilirmak, J. M.
A1  - Rösler, Frank
A1  - Khader, P. H.
T1  - Control processes during selective long-term memory retrieval
JF  - NeuroImage : a journal of brain function
N2  - In our daily life, we often need to selectively remember information related to the same retrieval cue in a consecutive manner (e.g., ingredients from a recipe). To investigate such selection processes during cued long-term memory (LTM) retrieval, we used a paradigm in which the retrieval demands were systematically varied from trial to trial and analyzed, by means of behavior and slow cortical EEG potentials (SCPs), the retrieval processes in the current trial depending on those of the previous trial. We varied whether the retrieval cue, the type of to-be-retrieved association (feature), or retrieval load was repeated or changed from trial to trial. The behavioral data revealed a benefit of feature repetition, probably due to trial-by-trial feature priming. SCPs further showed an effect of cue change with a mid-frontal maximum, suggesting increased control demands when the cue was repeated, as well as a parietal effect of retrieval-load change, indicating increased activation of posterior neural resources when focusing on a single association after all learned associations had been activated previously, compared to staying with single associations across trials. These effects suggest the existence of two distinct types of dynamic (trial-by-trial) control processes during LTM retrieval: (1) medial frontal processes that monitor or regulate interference within a set of activated associations, and (2) posterior processes regulating attention to LTM representations. The present study demonstrates that processes mediating selective LTM retrieval can be successfully studied by manipulating the history of processing demands in trial sequences.
KW  - Cognitive control
KW  - Long-term memory
KW  - ERPs
KW  - SCPs
KW  - Retrieval
KW  - Selection processes
Y1  - 2012
U6  - https://doi.org/10.1016/j.neuroimage.2011.08.041
SN  - 1053-8119
VL  - 59
IS  - 2
SP  - 1830
EP  - 1841
PB  - Elsevier
CY  - San Diego
ER  - 
TY  - JOUR
A1  - Ventura-Bort, Carlos
A1  - Wirkner, Janine
A1  - Dolcos, Florin
A1  - Wendt, Julia
A1  - Hamm, Alfons O.
A1  - Weymar, Mathias
T1  - Enhanced spontaneous retrieval of cues from emotional events: an ERP study
JF  - Biological psychology
N2  - Recent evidence points to enhanced episodic memory retrieval not only for emotional items but also for neutral information encoded in emotional contexts. However, prior research only tested instructed explicit recognition, and hence here we investigated whether memory retrieval is also heightened for cues from emotional contexts when retrieval is not explicitly probed. During the first session of a two-session experiment, neutral objects were presented on different background scenes varying in emotional and neutral contents. One week later, objects were presented again (with no background) intermixed with novel objects. In both sessions, participants were instructed to attentively watch the stimuli (free viewing procedure), and during the second session, ERPs were also collected to measure the ERP Old/New effect, an electrophysiological correlate of episodic memory retrieval. Analyses were performed using cluster-based permutation tests in order to identify reliable spatiotemporal ERP differences. Based on this approach, old relative to new objects, were associated with larger ERP positivity in an early (364-744 ms) and late time window (760-1148 ms) over distinct central electrode clusters. Interestingly, significant late ERP Old/New differences were only observed for objects previously encoded with emotional, but not neutral scenes (504 to 1144 ms). Because these ERP differences were observed in a non-instructed retrieval context, our results indicate that long-term, spontaneous retrieval for neutral objects, is particularly heightened if encoded within emotionally salient contextual information. These findings may assist in understanding mechanisms underlying spontaneous retrieval of emotional associates and the utility of ERPs to study maladaptive involuntary memories in trauma- and stress-related disorders.
KW  - Event-related potentials
KW  - ERP
KW  - Emotion
KW  - Retrieval
KW  - Spontaneous memory
KW  - Old/New effect
Y1  - 2019
U6  - https://doi.org/10.1016/j.biopsycho.2019.107742
SN  - 0301-0511
SN  - 1873-6246
VL  - 148
PB  - Elsevier
CY  - Amsterdam
ER  -