Understanding emotional memory trade-offs: Considering the effect of trait anxiety and posttraumatic stress disorder

Thesis advisor: Elizabeth A. KensingerThough people tend to remember emotional information with extreme vividness, this vividness often comes at the cost of memory for surrounding information. The goal of this dissertation is to investigate this memory trade-off and how it is influenced by focused attention, trait anxiety, and posttraumatic stress disorder (PTSD). In each study, participants were shown composite pictures that included an emotional or neutral item placed on a neutral background. Later, they were shown the same items and backgrounds separately. A memory trade-off occurred when participants were more likely to remember emotional items and forget the associated backgrounds as compared to equivalent memory for neutral items and backgrounds. The results from the first chapter revealed that the amount of overt visual attention on an emotional item did not predict the presence of the memory trade-off. However, when it was task relevant to disengage one's attention from the emotional item, the memory trade-off was dampened. Further, dividing attention had no effect on the memory trade-off. The results of the second chapter demonstrated that the memory trade-off was enhanced for emotional items with high levels of arousal as compared to low arousal items. This enhancement was especially strong for individuals with high trait anxiety, when this information was negative and arousing, and when the scene was remembered with a sense of familiarity. Further, for items and backgrounds that were vividly recollected, individuals with higher levels of anxiety were less likely to be able to modulate the memory trade-off, even when it was task relevant to attend to background information. The third chapter revealed that people with PTSD have a larger memory trade-off for both positive and negative information, despite the lack of overall item memory differences. These studies reveal that attention may not be the only factor that influences the memory trade-off and that the memory trade-off may be influenced by trait anxiety and PTSD.Thesis (PhD) — Boston College, 2011.Submitted to: Boston College. Graduate School of Arts and Sciences.Discipline: Psychology

The effects of trauma exposure and posttraumatic stress disorder (PTSD) on the emotion-induced memory trade-off

Many past examinations of memory changes in individuals with posttraumatic stress disorder (PTSD) have focused on changes in memory for trauma. However, it is unclear if these mnemonic differences extend beyond the memory of the trauma to memory for other positive and negative information and if they are specific to individuals with PTSD or extend to other individuals who have experienced trauma. The present study examined the influences of trauma exposure and PTSD on an effect that may parallel tunnel memory in PTSD: the emotion-induced memory trade-off, whereby emotional aspects of an experience are remembered at the expense of the nonemotional context. Three groups of participants (25 with current PTSD, 27 who had experienced trauma but did not have current PTSD, and 25 controls who had neither experienced significant trauma nor met criteria for current PTSD) were shown complex visual scenes that included an item (positive, negative, or neutral) placed on a neutral background. Forty-five minutes later, participants underwent a recognition memory test for the items and backgrounds separately. An emotion-induced memory trade-off was said to occur when there was a significant difference in item and background memory for emotional scenes, but not for neutral scenes. Results indicated that people with PTSD, like the other groups, were more likely to remember positive and negative items than neutral items. Moreover, people with PTSD exhibited a memory trade-off comparable in magnitude to that exhibited by the non-trauma control group. In contrast, trauma-exposed people without a current diagnosis of PTSD did not show a trade-off, because they remembered items within scenes better than their accompanying contexts not only for emotional but also for neutral scenes. These results suggest that (1) the effect of emotion on memory for visual scenes is similar in people with PTSD and control participants, and (2) people who have experienced trauma, but do not have PTSD, may have a different way of attending to and remembering visual scenes, exhibiting less of a memory trade-off than either control participants or people with PTSD

Affect enhances object-background associations: evidence from behaviour and mathematical modelling

In recognition memory paradigms, emotional details are often recognised better than neutral ones, but at the cost of memory for peripheral details. We previously provided evidence that, when peripheral details must be recalled using central details as cues, peripheral details from emotional scenes are at least as likely to be recalled as those from neutral scenes. Here we replicated and explicated this result by implementing a mathematical modelling approach to disambiguate the influence of target type, scene emotionality, scene valence, and their interactions. After incidentally encoding scenes that included neutral backgrounds with a positive, negative, or neutral foreground objects, participants showed equal or better cued recall of components from emotional scenes compared to neutral scenes. There was no evidence of emotion-based impairment in cued recall in either of two experiments, including one in which we replicated the emotion-induced memory trade-off in recognition. Mathematical model fits indicated that the emotionality of the encoded scene was the primary driver of improved cued-recall performance. Thus, even when emotion impairs recognition of peripheral components of scenes, it can preserve the ability to recall which scene components were studied together

The Effects of Arousal and Attention on Emotional False Memory Formation

Previous research has shown that with reduced attention at encoding, false recognition of critical lures for negative arousing DRM lists were higher than positive arousing lists. The current study extends this research to examine the role of attention for both arousing and nonarousing valenced false memory formation. Further, due to contradictory findings in past research, we examined attention at encoding using both within- (Experiment 1) and between-(Experiment 2) participants design. Participants were exposed to high and low arousing, valenced DRM lists under full and reduced attention conditions. Experiment 1 revealed that only negative arousing false memories were not affected by reduced attention at study, all other false memories decreased. In Experiment 2, although recognition of negative high arousing critical lures was higher, false memories increased in the reduced attention condition for all list types. Differences in attention during encoding affect the retrieval of emotional stimuli dependent on arousal and valence, however, our decision strategies can override the impact of this when it comes to retrieval

Differential effects of valence and encoding strategy on internal source memory and judgments of source: exploring the production and the self-reference effect

The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fpsyg.2019.01326/full#supplementary-materialItem memory studies show that emotional stimuli are associated with improved memory performance compared to neutral ones. However, emotion-related effects on source memory are less consistent. The current study probed how emotional valence and specific encoding conditions influence internal source memory performance and judgments of source (JOSs). In two independent experiments, participants were required to read silently/aloud (Experiment 1) or to perform self-reference/common judgments (Experiment 2) on a list of negative/neutral/positive words. They also performed immediate JOSs ratings for each word. The study phase was followed by a test phase in which participants performed old-new judgments. In Experiment 1, the production effect was replicated for item memory, but the effects of valence on item and source memory were not significant. In Experiment 2, self-referential processing effects on item and source memory differed as a function of valence. In both experiments, JOSs ratings were sensitive to valence and encoding conditions, although they were not predictive of objective memory performance. These findings demonstrate that the effects of valence on internal source memory and JOSs are modulated by encoding strategy. Thus, the way information is encoded can shed light on how emotion might enhance, impair or exert no influence on source memory.This work was supported by a Ph.D. Fellowship (PD/BD/105964/2014), awarded to DP, funded by the Portuguese Science Foundation (FCT) through national funds and cofunded by the European Social Fund (ESF) through the Operational Programme for Human Capital (POCH). It was also supported by a research grant (PTDC/MHC-PCN/0101/2014) funded by FCT and awarded to AP. The study was conducted at the Psychology Research Centre (PSI/01662), School of Psychology, University of Minho, and supported by FCT and the Portuguese Ministry of Science, Technology and Higher Education (UID/PSI/01662/2019), through the national funds (PIDDAC) and co-funded by FEDER through COMPETE2020 under the PT2020 Partnership Agreement (POCI-01-0145-FEDER-007653)

Affect enhances object-background associations: Evidence from behavior and mathematical modeling

In recognition memory paradigms, emotional details are often recognized better than neutral ones, but at the cost of memory for peripheral details. We previously provided evidence that, when peripheral details must be recalled using central details as cues, peripheral details from emotional scenes are at least as likely to be recalled as those from neutral scenes. Here we replicated and explicated this result by implementing a mathematical modeling approach to disambiguate the influence of target type, scene emotionality, scene valence, and their interactions. After incidentally encoding scenes that included neutral backgrounds with a positive, negative, or neutral foreground objects, participants showed equal or better cued recall of components from emotional scenes compared to neutral scenes. There was no evidence of emotion-based impairment in cued recall in either of two experiments, including one in which we replicated the emotion-induced memory trade-off in recognition. Mathematical model fits indicated that the emotionality of the encoded scene was the primary driver of improved cued-recall performance. Thus, even when emotion impairs recognition of peripheral components of scenes, it can preserve the ability to recall which scene components were studied together