TY  - JOUR
A1  - Weymar, Mathias
A1  - Bradley, Margaret M.
A1  - Sege, Christopher T.
A1  - Lang, Peter J.
T1  - Neural activation and memory for natural scenes
BT  - explicit and spontaneous retrieval
JF  - Psychophysiology : journal of the Society for Psychophysiological Research
N2  - Stimulus repetition elicits either enhancement or suppression in neural activity, and a recent fMRI meta-analysis of repetition effects for visual stimuli (Kim, 2017) reported cross-stimulus repetition enhancement in medial and lateral parietal cortex, as well as regions of prefrontal, temporal, and posterior cingulate cortex. Repetition enhancement was assessed here for repeated and novel scenes presented in the context of either an explicit episodic recognition task or an implicit judgment task, in order to study the role of spontaneous retrieval of episodic memories. Regardless of whether episodic memory was explicitly probed or not, repetition enhancement was found in medial posterior parietal (precuneus/cuneus), lateral parietal cortex (angular gyrus), as well as in medial prefrontal cortex (frontopolar), which did not differ by task. Enhancement effects in the posterior cingulate cortex were significantly larger during explicit compared to implicit task, primarily due to a lack of functional activity for new scenes. Taken together, the data are consistent with an interpretation that medial and (ventral) lateral parietal cortex are associated with spontaneous episodic retrieval, whereas posterior cingulate cortical regions may reflect task or decision processes.
KW  - fMRI
KW  - posterior parietal
KW  - repetition
KW  - retrieval
KW  - spontaneous memory
Y1  - 2018
U6  - https://doi.org/10.1111/psyp.13197
SN  - 0048-5772
SN  - 1469-8986
VL  - 55
IS  - 10
PB  - Wiley
CY  - Hoboken
ER  - 
TY  - JOUR
A1  - Sege, Christopher T.
A1  - Bradley, Margaret M.
A1  - Weymar, Mathias
A1  - Lang, Peter J.
T1  - A direct comparison of appetitive and aversive anticipation
BT  - overlapping and distinct neural activation
JF  - Behavioural brain research : an international journal
N2  - fMRI studies of reward find increased neural activity in ventral striatum and medial prefrontal cortex (mPFC), whereas other regions, including the dorsolateral prefrontal cortex (d1PFC), anterior cingulate cortex (ACC), and anterior insula, are activated when anticipating aversive exposure. Although these data suggest differential activation during anticipation of pleasant or of unpleasant exposure, they also arise in the context of different paradigms (e.g., preparation for reward vs. threat of shock) and participants. To determine overlapping and unique regions active during emotional anticipation, we compared neural activity during anticipation of pleasant or unpleasant exposure in the same participants. Cues signalled the upcoming presentation of erotic/romantic, violent, or everyday pictures while BOLD activity during the 9-s anticipatory period was measured using fMRI. Ventral striatum and a ventral mPFC subregion were activated when anticipating pleasant, but not unpleasant or neutral, pictures, whereas activation in other regions was enhanced when anticipating appetitive or aversive scenes.
KW  - Anticipation
KW  - Emotion
KW  - fMRI
Y1  - 2017
U6  - https://doi.org/10.1016/j.bbr.2017.03.005
SN  - 0166-4328
SN  - 1872-7549
VL  - 326
SP  - 96
EP  - 102
PB  - Elsevier
CY  - Amsterdam
ER  -