Emotion and memory
Emotion can have a powerful effect on humans and animals. Numerous studies have shown that the most vivid autobiographical memories tend to be of emotional events, which are likely to be recalled more often and with more clarity and detail than neutral events.
The activity of emotionally enhanced memory retention can be linked to human evolution; during early development, responsive behavior to environmental events would have progressed as a process of trial and error. Survival depended on behavioral patterns that were repeated or reinforced through life and death situations. Through evolution, this process of learning became genetically embedded in humans and all animal species in what is known as flight or fight instinct.
Artificially inducing this instinct through traumatic physical or emotional stimuli essentially creates the same physiological condition that heightens memory retention by exciting neuro-chemical activity affecting areas of the brain responsible for encoding and recalling memory. This memory-enhancing effect of emotion has been demonstrated in a large number of laboratory studies, using stimuli ranging from words to pictures to narrated slide shows, as well as autobiographical memory studies. However, as described below, emotion does not always enhance memory.
- 1 Arousal and valence in memory
- 1.1 Emotion and encoding
- 1.2 Emotion and storage
- 1.3 Emotion and retrieval
- 2 Memory of felt emotion
- 3 Emotion regulation effects on memory
- 4 Emotion-induced forgetting
- 5 Depression and memory
- 6 Dementia and emotional memory
- 7 Aging and emotional memory
- 8 Emotional memory and sleep
- 9 See also
- 10 Notes and references
Arousal and valence in memory
One of the most common frameworks in the emotions field proposes that affective experiences are best characterized by two main dimensions: arousal and valence. The dimension of valence ranges from highly positive to highly negative, whereas the dimension of arousal ranges from calming or soothing to exciting or agitating.
The majority of studies to date have focused on the arousal dimension of emotion as the critical factor contributing to the emotional enhancement effect on memory. Different explanations have been offered for this effect, according to the different stages of memory formation and reconstruction.
However, a growing body of research is dedicated to the emotional valence dimension and its effects on memory. It has been claimed that this is an essential step towards a more complete understanding of emotion effects on memory. The studies that did investigate this dimension have found that emotional valence alone can enhance memory; that is, nonarousing items with positive or negative valence can be better remembered than neutral items.
Emotion and encoding
From an information processing perspective, encoding refers to the process of interpreting incoming stimuli and combining the processed information. At the encoding level the following mechanisms have been suggested as mediators of emotion effects on memory:
Selectivity of attention
Easterbrook's (1959) cue utilization theory predicted that high levels of arousal will lead to attention narrowing, defined as a decrease in the range of cues from the stimulus and its environment to which the organism is sensitive. According to this hypothesis, attention will be focused primarily on the arousing details (cues) of the stimulus, so that information central to the source of the emotional arousal will be encoded while peripheral details will not.
Accordingly, several studies have demonstrated that the presentation of emotionally arousing stimuli (compared to neutral stimuli) results in enhanced memory for central details (details central to the appearance or meaning of the emotional stimuli) and impaired memory for peripheral details. Also consistent with this hypothesis are findings of weapon focus effect, in which witnesses to a crime remember the gun or knife in great detail but not other details such as the perpetrator's clothing or vehicle. In laboratory replications it was found that participants spend a disproportionate amount of time looking at a weapon in a scene, and this looking time is inversely related to the likelihood that individuals will subsequently identify the perpetrator of the crime. Other researchers have suggested arousal may also increase the duration of attentional focusing on the arousing stimuli, thus delaying the disengagement of attention from it. Ochsner (2000) summarized the different findings and suggested that by influencing attention selectivity and dwell time, arousing stimuli are more distinctively encoded, resulting in more accurate memory of those stimuli.
While these previous studies focused on how emotion affects memory for emotionally arousing stimuli, in their arousal-biased competition theory, Mather and Sutherland (2011) argue that how arousal influences memory for non-emotional stimuli depends on the priority of those stimuli at the time of the arousal. Arousal enhances perception and memory of high priority stimuli but impairs perception and memory of low priority stimuli. Priority can be determined by bottom-up salience or by top-down goals.
Emotional items also appear more likely to be processed when attention is limited, suggesting a facilitated or prioritized processing of emotional information. This effect was demonstrated using the attentional blink paradigm in which 2 target items are presented in close temporal proximity within a stream of rapidly presented stimuli.
The typical finding is that participants often miss the second target item, as if there were a "blink" of attention following the first target's presentation, reducing the likelihood that the second target stimulus is attended. However, when the second target stimulus elicits emotional arousal (a "taboo" word), participants are less likely to miss the target's presentation, which suggests that under conditions of limited attention, arousing items are more likely to be processed than neutral items.
Additional support for the Prioritized processing hypothesis was provided by studies investigating the visual extinction deficit. People suffering from this deficit can perceive a single stimulus in either side visual field if it is presented alone but are unaware of the same stimulus in the visual field opposed to the lesional side, if another stimulus is presented simultaneously on the lesional side.
Emotion has been found to modulate the magnitude of the visual extinction deficit, so that items that signal emotional relevance (e.g., spiders) are more likely to be processed in the presence of competing distractors than nonemotional items (e.g., flowers).
Emotion and storage
In addition to its effects during the encoding phase, emotional arousal appears to increase the likelihood of memory consolidation during the retention (storage) stage of memory (the process of creating a permanent record of the encoded information). A number of studies show that over time, memories for neutral stimuli decrease but memories for arousing stimuli remain the same or improve.
Others have discovered that memory enhancements for emotional information tend to be greater after longer delays than after relatively short ones. This delayed effect is consistent with the proposal that emotionally arousing memories are more likely to be converted into a relatively permanent trace, whereas memories for nonarousing events are more vulnerable to disruption.
A few studies have even found that emotionally arousing stimuli enhance memory only after a delay. The most famous of these was a study by Kleinsmith and Kaplan (1963) that found an advantage for numbers paired with arousing words over those paired with neutral words only at delayed test, but not at immediate test. As outlined by Mather (2007), the Kleinsmith and Kaplan effects were most likely due to a methodological confound. However, Sharot and Phelps (2004) found better recognition of arousing words over neutral words at a delayed test but not at an immediate test, supporting the notion that there is enhanced memory consolidation for arousing stimuli. According to these theories, different physiological systems, including those involved in the discharge of hormones believed to affect memory consolidation, become active during, and closely following, the occurrence of arousing events.
Another possible explanation for the findings of the emotional arousal delayed effect is post-event processing regarding the cause of the arousal. According to the post stimulus elaboration (PSE) hypothesis, an arousing emotional experience may cause more effort to be invested in elaboration of the experience, which would subsequently be processed at a deeper level than a neutral experience. Elaboration refers to the process of establishing links between newly encountered information and previously stored information.
It has long been known that when individuals process items in an elaborative fashion, such that meaning is extracted from items and inter-item associations are formed, memory is enhanced. Thus, if a person gives more thought to central details in an arousing event, memory for such information is likely to be enhanced. However, these processes could also disrupt consolidation of memories for peripheral details. Christianson (1992) suggested that the combined action of perceptual, attentional, and elaborative processing, triggered by an emotionally arousing experience, produces memory enhancements of details related to the emotion laden stimulus, at the cost of less elaboration and consolidation of memory for the peripheral details.
Emotion and elaboration
The processes involved in this enhancement may be distinct from those mediating the enhanced memory for arousing items. It has been suggested that in contrast to the relatively automatic attentional modulation of memory for arousing information, memory for non-arousing positive or negative stimuli may benefit instead from conscious encoding strategies, such as elaboration. This elaborative processing can be autobiographical or semantic.
Autobiographical elaboration is known to benefit memory by creating links between the processed stimuli, and the self, for example, deciding whether a word would describe the personal self. Memory formed through autobiographical elaboration is enhanced as compared to items processed for meaning, but not in relation to the self.
Since words such as "sorrow" or "comfort" may be more likely to be associated with autobiographical experiences or self-introspection than neutral words such as "shadow", autobiographical elaboration may explain the memory enhancement of non-arousing positive or negative items. Studies have shown that dividing attention at encoding decreases an individual's ability to utilize controlled encoding processes, such as autobiographical or semantic elaboration.
Thus, findings that participants' memory for negative non-arousing words suffers with divided attention, and that the memory advantage for negative, non-arousing words can be eliminated when participants encode items while simultaneously performing a secondary task, has supported the elaborative processing hypothesis as the mechanism responsible for memory enhancement for negative non-arousing words.
Emotion and retrieval
Retrieval is a process of reconstructing past experiences; this phenomenon of reconstruction is influenced by a number of different variables described below.
Trade-off between details
Kensinger argues there are two trade-offs: central/peripheral trade-off of details and a specific/general trade-off. Emotional memories may include increased emotional details often with the trade-off of excluding background information. Research has shown that this trade-off effect cannot be explained exclusively by overt attention (measured by eye-tracking directed to emotional items during encoding) (Steinmetz & Kensinger, 2013).
Contextual effects of emotion on memory
Contextual effects occur as a result of the degree of similarity between the encoding context and the retrieval context of an emotional dimension. The main findings are that the current mood we are in affects what is attended, encoded and ultimately retrieved, as reflected in two similar but subtly different effects: the mood congruence effect and mood-state dependent retrieval. Positive encoding contexts have been connected to activity in the right fusiform gyrus. Negative encoding contexts have been correlated to activity in the right amygdala (Lewis & Critchley, 2003). However, Lewis and Critchley (2003) claim that it is not clear whether involvement of the emotional system in encoding memory differs for positive or negative emotions, or whether moods at recall lead to activity in the corresponding positive or negative neural networks.
The mood congruence effect
The mood congruence effect refers to the tendency of individuals to retrieve information more easily when it has the same emotional content as their current emotional state. For instance, being in a depressed mood increases the tendency to remember negative events (Drace, 2013).
Mood-state dependent retrieval
Another documented phenomenon is the mood-state dependent retrieval, a type of context-dependent memory. The retrieval of information is more effective when the emotional state at the time of retrieval is similar to the emotional state at the time of encoding.
Thus, the probability of remembering an event can be enhanced by evoking the emotional state experienced during its initial processing. These two phenomena, the mood congruity effect and mood-state dependent retrieval, are similar to the context effects which have been traditionally observed in memory research (Baddeley, 1993) It may also relate to the phenomena of state-dependent memory in neuropsychopharmacology.
Thematic vs. sudden appearance of emotional stimuli
A somewhat different contextual effect stemmed from the recently made distinction between thematical and sudden appearance of an emotionally arousing event, suggesting that the occurrence of memory impairments depends on the way the emotional stimuli are induced. Laney et al. (2003) argued that when arousal is induced thematically (i.e., not through the sudden appearance of a discrete shocking stimulus such as a weapon but rather through involvement in an unfolding event plot and empathy with the victim as his or her plight becomes increasingly apparent), memory enhancements of details central to the emotional stimulus need not come at the expense of memory impairment of peripheral details.
Laney et al. (2004) demonstrated this by using an audio narrative to give the presented slides either neutral or emotional meaning, instead of presenting shockingly salient visual stimuli. In one of the experiments, participants in both the neutral and emotional conditions viewed slides of a date scenario of a woman and man at a dinner date. The couple engaged in conversation, then, at the end of the evening, embraced. The event concluded with the man leaving and the woman phoning a friend.
The accompanying audio recording informed participants in the neutral condition that the date went reasonably well, while participants in the emotional condition heard that, as the evening wore on, the man displayed some increasingly unpleasant traits of a type that was derogatory to women, and the embrace at the end of the evening was described as an attempt to sexually assault the woman.
As expected, the results revealed that details central to the event were remembered more accurately when that event was emotional than when neutral, However, this was not at the expense of memory for peripheral (in this case, spatially peripheral or plot-irrelevant) details, which were also remembered more accurately when the event was emotional. Based on these findings it has been suggested that the dual enhancing and impairing effects on memory are not an inevitable consequence of emotional arousal.
Memory of felt emotion
Many researchers use self-report measures of felt emotion as a manipulation check. This raises an interesting question and a possible methodological weakness: are people always accurate when they recall how they felt in the past? Several findings suggest this is not the case. For instance, in a study of memory for emotions in supporters of former U.S. presidential candidate Ross Perot, supporters were asked to describe their initial emotional reactions after Perot's unexpected withdrawal in July 1992 and again after the presidential election that November.
Between the two assessment periods, the views of many supporters changed dramatically as Perot re-entered the race in October and received nearly a fifth of the popular vote. The results showed that supporters recalled their past emotions as having been more consistent with their current appraisals of Perot than they actually were.
Another study found that people's memories for how distressed they felt when they learned of the 9/11 terrorist attacks changed over time and moreover, were predicted by their current appraisals of the impact of the attacks (Levine et al., 2004). It appears that memories of past emotional responses are not always accurate, and can even be partially reconstructed based on their current appraisal of events.
Studies have shown that as episodic memory becomes less accessible over time, the reliance on semantic memory to remember past emotions increases. In one study Levine(2009) primes of the cultural belief of women being more emotional than men had a greater effect on responses for older memories compared to new memories. The long term recall of emotions was more in line with the primed opinions, showing that long term recall of emotions was heavily influenced by current opinions.
Emotion regulation effects on memory
An interesting issue in the study of the emotion-memory relationship is whether our emotions are influenced by our behavioral reaction to them, and whether this reaction—in the form of expression or suppression of the emotion—might affect what we remember about an event. Researchers have begun to examine whether concealing feelings influences our ability to perform common cognitive tasks, such as forming memories, and found that the emotion regulation efforts do have cognitive consequences. In the seminal work on negative affect arousal and white noise, Seidner found support for the existence of a negative affect arousal mechanism through observations regarding the devaluation of speakers from other ethnic origins."
In a study of Richards and Gross (1999) and Tiwari (2013), participants viewed slides of injured men that produced increases in negative emotions, while information concerning each man was presented orally with his slide. The participants were assigned to either an expressive suppression group (where they were asked to refrain from showing emotion while watching the slides) or to a control group (where they were not given regulatory instructions at all). As predicted by the researchers, suppressors showed significantly worse performance on a memory test for the orally presented information. Several related studies have reached similar results. It was demonstrated that the effects of expressive suppression on memory generalize to emotionally positive experiences and to socially relevant contexts.
One possible answer to the question "why does emotion suppression impair memory?" might lay in the self monitoring efforts invested in order to suppress emotion (thinking about the behavior one is trying to control). A recent study found heightened self- monitoring efforts among suppressors relative to control participants.
That is, suppressors were more likely to report thinking about their behavior and the need to control it during a conversation. Increases in self-monitoring predicted decreases in memory for what was said, that is, people who reported thinking a lot about controlling their behavior had particularly impoverished memories. However, additional research is needed to confirm whether self-monitoring actually exerts a causal effect on memory
Emotionally arousing stimuli can lead to retrograde amnesia for preceding events and anterograde amnesia for subsequent events. This has been demonstrated in lab studies with lists of words or pictures, in which people show impaired memory for stimuli appearing before or after arousing stimuli.
Depression and memory
Memory recall tends to be congruent with one's current mood, with depressed people more likely to recall negative events from the past In addition, depression is often associated with poor memory in general, as outlined here.
Dementia and emotional memory
Several studies have demonstrated emotional memory enhancement in Alzheimer's patients suggesting that emotional memory enhancement might be used in the daily management of Alzheimer's patients. One study found that objects are recalled significantly better in Alzheimer's patients if they were presented as birthday presents to AD patients.
Aging and emotional memory
The enhancing effects of emotional arousal on later memory recall tend to be maintained among older adults and the amygdala shows relatively less decline than many other brain regions. However, older adults also show somewhat of a shift towards favoring positive over negative information in memory, leading to a positivity bias.
Emotional memory and sleep
Emotional memory and sleep has been a well-researched association. Emotional memories are consolidated greater during sleep, rather than neutral memories. Studies have investigated high valence and arousing words, in comparison to neutral words. Sleep enhances the consolidation of the high valence and arousing words and therefore these are remembered more post-sleep. This concept has been demonstrated in many studies using a variety of media such as pictures, film clips and words.
Memories of 'future relevance' are also consolidated greater during sleep. In a study by Wilhelm et al., 2011, memories of items that participants knew were needed for the future (for the testing session) were remembered more after sleep. Sleep consolidated these memories of future relevance to a greater extent. Memories that are emotionally significant and relevant for the future are therefore preferentially consolidated during sleep. This can translate to mean that memories that are more meaningful or valuable to a person are consolidated more.
The concept of emotional memory and sleep can be applied to real-life situations e.g. by developing more effective learning strategies. One could integrate the memorization of information that possesses high emotional significance (highly salient) with information that holds little emotional significance (low salience), prior to a period of sleep.
- Autobiographical memory
- Dispositional affect
- Emotional contagion
- Emotional labor
- Emotions in decision making
- Flashbulb memory
- List of emotions
- Law of effect
- Memory and aging
- Mood-dependent memory
- Peak-end rule
- Principles of learning
- Yerkes-Dodson law
- Psychogenic amnesia; Dissociative Amnesia (formerly Psychogenic Amnesia) (DSM-IV Dissociative Disorders 300.12)
Notes and references
- William Cushman, 2007.
- Christianson, S.A.; Loftus, E. (1990). "Some characteristics of people's traumatic memories". Bulletin of the Psychonomic Society. 28: 195–198. doi:10.3758/bf03334001.
- Schacter, D. L. (1996). Searching for memory. New York: Basic Books.
- Bradley, M. M.; Greenwald, M. K.; Petry, M. C.; Lang, P. J. (1992). "Remembering pictures: Pleasure and arousal in memory". Journal of Experimental Psychology: Learning, Memory, & Cognition. 18 (2): 379–390. doi:10.1037/0278-73220.127.116.119.
- Hamann, S.B. (2001). "Cognitive and neural mechanisms of emotional memory". Trends in Cognitive Sciences. 5 (9): 394–400. PMID 11520704. doi:10.1016/S1364-6613(00)01707-1.
- Christianson, S. A. (1992). "Emotional stress and eyewitness memory: A critical review". Psychological Bulletin. 112 (2): 284–309. PMID 1454896. doi:10.1037/0033-2909.112.2.284.
- Conway, M. A.; Anderson, S. J.; Larsen, S. F.; Donnelly, C. M.; McDaniel, M. A.; McClelland, A.G.R.; Rawls, R.E.; Logie, R.H. (1994). "The formation of flash bulb memories". Memory and Cognition. 22 (3): 326–343. PMID 8007835. doi:10.3758/BF03200860.
- Russell, J. A. (1980). "A circumplex model of affect". Journal of Personality and Social Psychology. 39 (6): 1161–1178. doi:10.1037/h0077714.
- Lang PJ, Greenwald MK, Bradley MM, Hamm AO. Looking at pictures: affective, facial, visceral and behavioral reactions" Psychophysiology 1993; 30: 261-273.
- Cahill, L.; McGaugh, J. L. (1995). "A novel demonstration of enhanced memory associated with emotional arousal". Consciousness and Cognition. 4 (4): 410–421. PMID 8750416. doi:10.1006/ccog.1995.1048.
- Kensinger, E. A. (2004). "Remembering emotional experiences: The contribution of valence and arousal". Reviews in the Neurosciences. 15 (4): 241–251. PMID 15526549. doi:10.1515/REVNEURO.2004.15.4.241.
- Ochsner, K. N. (2000). "Are affective events richly recollected or simply familiar? The experience and process of recognizing feelings past". Journal of Experimental Psychology. General. 129 (2): 242–261. PMID 10868336. doi:10.1037/0096-3418.104.22.168.
- LaBar, K. S.; Phelps, E. A. (1998). "Arousal-mediated memory consolidation: Role of the medial temporal lobe in humans". Psychological Science. 9 (6): 490–493. doi:10.1111/1467-9280.00090.
- Kensinger EA, Corkin S. Memory enhancement for emotional words: Are emotional words more vividly remembered than neutral words?" Memory and Cognition 2003; 31:1169-1180.
- Easterbrook, J. A. (1959). "The effect of emotion on cue utilization and the organization of behaviour". Psychological Review. 66 (3): 183–201. PMID 13658305. doi:10.1037/h0047707.
- Sharot, T; Phelps, E A (2004). "How arousal modulates memory: Disentangling the effects of attention and retention". Cognitive, Affective, & Behavioral Neuroscience. 4 (3): 294–306. doi:10.3758/CABN.4.3.294.
- Burke, A.; Heuer, F.; Reisberg, D. (1992). "Remembering emotional events". Memory & Cognition. 20 (3): 277–290. doi:10.3758/BF03199665.
- Hulse, L. M.; Memon, A. (2006). "Fatal impact? The effects of emotional arousal and weapon presence on police officers' memories for a simulated crime". Legal and Criminological Psychology. 11 (2): 313–325. doi:10.1348/135532505X58062.
- Loftus, E. F. (1979). "The malleability of human memory". American Scientist. 67 (3): 312–320. Bibcode:1979AmSci..67..312L. PMID 475150.
- Loftus, E. F.; Loftus, G. R.; Messo, J. (1987). "Some facts about "weapon focus"". Law and Human Behavior. 11: 55–62. doi:10.1007/BF01044839.
- Fox, E.; Russo, R.; Bowles, R.; Dutton, K. (2001). "Do threatening stimuli draw or hold visual attention in subclinical anxiety?". Journal of Experimental Psychology: General. 130 (4): 681–700. doi:10.1037/0096-3422.214.171.1241.
- Mather, M.; Sutherland, M. R. (2011). "Arousal-biased competition in perception and memory.". Perspectives on Psychological Science. 6 (2): 114–133. PMC . PMID 21660127. doi:10.1177/1745691611400234.
- Raymond, Jane E.; Shapiro, Kimron L.; Arnell, Karen M. (1992). "Temporary suppression of visual processing in an RSVP task: An attentional blink?". Journal of Experimental Psychology: Human Perception and Performance. 18 (3): 849–60. PMID 1500880. doi:10.1037/0096-15126.96.36.1999.
- Anderson, A. K.; Phelps, E. A. (2001). "Lesions of the human amygdala impair enhanced perception of emotionally salient events". Nature. 411 (6835): 305–309. PMID 11357132. doi:10.1038/35077083.
- Lucas, Nadia; Vuilleumier, Patrik (2008). "Effects of emotional and non-emotional cues on visual search in neglect patients: Evidence for distinct sources of attentional guidance". Neuropsychologia. 46 (5): 1401–1414. PMID 18289616. doi:10.1016/j.neuropsychologia.2007.12.027.
- Baddeley, A. D. (1982). "Implications of neuropsychological evidence for theories of normal memory". Philosophical Transactions of the Royal Society B. 298 (1089): 59–72. Bibcode:1982RSPTB.298...59B. doi:10.1098/rstb.1982.0072.
- Kleinsmith, L. J.; Kaplan, S. (1963). "Paired-associate learning as a function of arousal and interpolated interval". Journal of Experimental Psychology. 65 (2): 190–193. PMID 14033436. doi:10.1037/h0040288.
- Eysenck, M. W. (1976). "Arousal, learning, and memory". Psychological Bulletin. 83 (3): 389–404. PMID 778883. doi:10.1037/0033-2909.83.3.389.
- Heuer, F.; Reisberg, D. (1990). "Vivid memories of emotional events: The accuracy of remembered minutiae". Memory & Cognition. 18 (5): 496–50. doi:10.3758/BF03198482.
- Mather, M. (2007). "Emotional arousal and memory binding: An object-based framework". Perspectives on Psychological Science. 2: 33–52. doi:10.1111/j.1745-6916.2007.00028.x.
- McGaugh, J. L. (1992). Affect, neuromodulatory systems and memory storage. In S. Christianson (Ed.), The handbook of emotion and memory: Research and theory (pp. 269-288).
- McGaugh, J.L. (2000). "Memory: A Century of Consolidation". Science. 287 (5451): 248–251. Bibcode:2000Sci...287..248M. PMID 10634773. doi:10.1126/science.287.5451.248.
- Buchanan, T. W.; Lovallo, W. R. (2001). "Enhanced memory for emotional material following stress-level cortisol treatment in humans". Psychoneuroendocrinology. 26 (3): 307–317. PMID 11166493. doi:10.1016/S0306-4530(00)00058-5.
- Craik, F.; Lockhart, R. (1972). "Levels of processing: A framework for memory research". Journal of Verbal Learning and Verbal Behavior. 11 (6): 671–684. doi:10.1016/S0022-5371(72)80001-X.
- Craik, F.I.M.; Tulving, E. (1975). "Depth of processing and the retention of words in episodic memory". Journal of Experimental Psychology: General. 104 (3): 268–294. doi:10.1037/0096-34188.8.131.528.
- Macrae, CN; Moran, JM; Heatherton, TF; Banfield, JF; Kelley, WM. (2004). "Medial prefrontal activity predicts memory for self". Cerebral Cortex. 14 (6): 647–54. PMID 15084488. doi:10.1093/cercor/bhh025.
- Rogers, TB; Kuiper, NA; Kirker, WS. (1977). "Self-reference and the encoding of personal information". Journal of Personality and Social Psychology. 35 (9): 677–88. PMID 909043. doi:10.1037/0022-35184.108.40.2067.
- Bush, SI; Geer, JH. (2001). "Implicit and explicit memory of neutral, negative emotional, and sexual information". Arch Sex Behav. 30 (6): 615–631. PMID 11725459. doi:10.1023/A:1011915001416.
- Kensinger, EA; Corkin, S. (2004). "Two routes to emotional memory: Distinct neural processes for valence and arousal". Proceedings of the National Academy of Sciences USA. 101 (9): 3310–3315. Bibcode:2004PNAS..101.3310K. doi:10.1073/pnas.0306408101.
- Kensinger, E.A. (2009). "Remembering the detail: Effects of emotion". Emotion Review. 1 (2): 99–113. doi:10.1177/1754073908100432.
- Bower, G.H. (1981). "Mood and memory". American Psychologist. 36 (2): 129–148. PMID 7224324. doi:10.1037/0003-066X.36.2.129.
- Watkins, P.C.; Vache, K.; Vernay, S.P.; Muller, S.; Mathews, A (1996). "Unconscious mood-congruent memory bias in depression". Journal of Abnormal Psychology. 105 (1): 34–41. PMID 8666709. doi:10.1037/0021-843X.105.1.34.
- Laney, C.; Heuer, F.; Reisberg, D. (2003). "Thematically-induced arousal in naturally- occurring emotional memories". Applied Cognitive Psychology. 17 (8): 995–1004. doi:10.1002/acp.951.
- Laney, C.; Campbell, H. V.; Heuer, F.; Reisberg, D. (2004). "Memory for thematically arousing events". Memory & Cognition. 32 (7): 1149–1159. doi:10.3758/BF03196888.
- Levine L.J. and Pizarro D.A. (2004) Emotion and memory research: A grumpy overview" Social Cognition, Vol. 22, No. 5, 2004, pp.530-554
- Levine, L.J. (1997). "Reconstructing memory for emotions". Journal of Experimental Psychology: General. 126: 165–177. doi:10.1037/0096-34220.127.116.11.
- Levine; Lench, Heather; Safer, Martin (2009). "Functions of Remembering and Misremembering Emotion". Applied Cognitive Psychology. 23: 1059–1075. doi:10.1002/acp.1610.
- Seidner, Stanley S. (1991). Negative Affect Arousal Reactions from Mexican and Puerto Rican Respondents. Washington, D.C.: ERIC.
- Richards, J. M.; Gross, J. J. (1999). "Composure at any cost? The cognitive consequences of emotion suppression". Personality and Social Psychology Bulletin. 25: 1033–1044. doi:10.1177/01461672992511010.
- Bonanno, G.A.; Papa, A.; O'Neill, K.; Westphal, M.; Coifman, K. (2004). "The importance of being flexible: The ability to enhance and suppress emotional expressions predicts long-term adjustment". Psychological Science. 15 (7): 482–487. PMID 15200633. doi:10.1111/j.0956-7976.2004.00705.x.
- Richards, J. M.; Gross, J. J. (2000). "Emotion regulation and memory: The cognitive costs of keeping one's cool" (PDF). Journal of Personality and Social Psychology. 79 (3): 410–424. PMID 10981843. doi:10.1037/0022-3518.104.22.1680. Archived from the original (PDF) on 2006-09-14.
- Richards, J.M.; Butler, E.A.; Gross, J.J. (2003). "Emotion regulation in romantic relationships: The cognitive consequences of concealing feelings" (PDF). Journal of Social and Personal Relationships. 20: 599–620. doi:10.1177/02654075030205002. Archived from the original (PDF) on 2006-12-10.
- Richards, JM (2004). "The Cognitive Consequences of Concealing Feelings" (PDF). Current Directions in Psychological Science. 13 (4): 131–134. doi:10.1111/j.0963-7214.2004.00291.x. Archived from the original (PDF) on 2006-12-08.
- Hurlemann, R.; et al. (2005). "Noradrenergic modulation of emotion-induced forgetting and remembering". Journal of Neuroscience. 25 (27): 6343–6349. PMID 16000624. doi:10.1523/JNEUROSCI.0228-05.2005.
- Strange, B. A.; Hurlemann, R.; Dolan, R. J. (2003). "An emotion-induced retrograde amnesia in humans is amygdala- and beta-adrenergic-dependent". Proceedings of the National Academy of Sciences of the United States of America. 100 (23): 13626–13631. Bibcode:2003PNAS..10013626S. PMC . PMID 14595032. doi:10.1073/pnas.1635116100.
- Hertel, P. (2004). Memory for emotional and nonemotional events in depression: A question of habit? In D. Reisberg and P. Hertel, (Eds.) Memory and Emotion. NY: Oxford University Press, 186-216.
- Kazui, H. (2000). "Impact of emotion on memory: Controlled study of the influence of emotionally charged material on declarative memory in Alzheimer's disease". The British Journal of Psychiatry. 177 (4): 343–7. doi:10.1192/bjp.177.4.343.
- Moayeri, Sharon E.; Cahill, Larry; Jin, Yi; Potkin, Steven G. (2000). "Relative sparing of emotionally influenced memory in Alzheimerʼs disease". NeuroReport. 11 (4): 653–5. PMID 10757495. doi:10.1097/00001756-200003200-00001.
- Dequeker, Jan; Boller, François; El Massioui, Farid; Degreef, Hugo; Busschots, Anne-Marie; Devouche, Emmanuel; Traykov, Latchezar; Mallia, Carmel; Pomati, Simone; Starkstein, S. E. (2002). "Processing Emotional Information in Alzheimer's Disease: Effects on Memory Performance and Neurophysiological Correlates". Dementia and Geriatric Cognitive Disorders. 14 (2): 104–12. PMID 12145458. doi:10.1159/000064932.
- Satler, C.; Garrido, L. M.; Sarmiento, E. P.; Leme, S.; Conde, C.; Tomaz, C. (2007). "Emotional arousal enhances declarative memory in patients with Alzheimer's disease". Acta Neurologica Scandinavica. 116 (6): 355–60. PMID 17986092. doi:10.1111/j.1600-0404.2007.00897.x.
- Sundstrøm, Martin (2011). "Modeling recall memory for emotional objects in Alzheimer's disease". Aging, Neuropsychology, and Cognition. 18 (4): 396–413. doi:10.1080/13825585.2011.567324.
- Mather, M. (2004). Aging and emotional memory. In D. Reisberg and P. Hertel, (Eds.) Memory and Emotion. NY: Oxford University Press, 272-307. PDF
- Walker, M.P. (2010). "Sleep, memory and emotion.". Progress in Brain Research. 185: 49–68. doi:10.1016/B978-0-444-53702-7.00004-X.
- Payne, JD; Chambers AM; Kensinger EA. (2012). "Sleep promotes lasting changes in selective memory for emotional scenes". Frontiers in Integrative Neuroscience. 21 (6): 108. doi:10.3389/fnint.2012.00108.
- Groch, S; Wilhelm I; Diekelmann S; Born J. (2013). "The role of REM sleep in the processing of emotional memories: evidence from behaviour and event-related potentials.". Neurobiology Learning Memory. 99: 1–9. doi:10.1016/j.nlm.2012.10.006.
- Wilhelm, I; Diekelmann S; Molzow I; Ayoub A; Mölle M; Born J (2011). "Sleep selectively enhances memory expected to be of future relevance.". Journal of Neuroscience. 31 (5): 1563–9. PMID 21289163. doi:10.1523/JNEUROSCI.3575-10.2011.
- Tiwari, G. K. (2013). "Emotional suppression and eyewitness memory". Jigyasa. 6 (4): 196–203.
- Drace, S (2013). "Evidence for the role of affect in mood congruent recall of autobiographic memories". Motivation & Emotion. 37 (3): 623–628. doi:10.1007/s11031-012-9322-5.
- Erk, S.; Kiefer, M.; Grothe, J.; Wunderlich, A. P.; Spitzer, M.; Walter, H. (2003). "Emotional context modulates subsequent memory effect". NeuroImage. 18 (2): 439–447. doi:10.1016/s1053-8119(02)00015-0.
- Lewis, P. A.; Critchley, H. D. (2003). "Mood-dependent memory". Trends in Cognitive Sciences. 7 (10): 431–433. doi:10.1016/j.tics.2003.08.005.
- Long, N. M.; Danoff, M. S.; Kahana, M. J. (2015). "Recall dynamics reveal the retrieval of emotional context". Psychonomic Bulletin & Review. 22 (5): 1328–1333. doi:10.3758/s13423-014-0791-2.
- Steinmetz, K. M.; Kensinger, E. A. (2013). "The emotion-induced memory trade-off: More than an effect of overt attention?". Memory & Cognition. 41 (1): 69–81. doi:10.3758/s13421-012-0247-8.