The days we never forget: Flashbulb memories across the life span in Alzheimer's disease.

Alzheimer's disease (AD) is characterized by autobiographical memory deficits, with the ability to retrieve episodic-rich memories being particularly affected. Here, we investigated the influence of AD on a specific subtype of episodic memories known as flashbulb memories (i.e., the ability to remember the personal circumstances for the reception of important news events). We examined the frequency, characteristics, and the temporal distribution of flashbulb memories across the life span. To this aim, 28 older adults diagnosed with AD and a matched sample of 29 healthy older controls were probed for flashbulb memories for two historical events from each decade of their lives. They also estimated the subjective degree of reexperiencing for the memories reported. AD participants showed impaired access to flashbulb memories, the frequency of reported memories being lower than for healthy older adults. However, qualitative aspects of AD participants' flashbulb memories were quite similar to those of the controls, as no group differences were obtained with respect to the canonical categories or degree of reexperience. AD participants' flashbulb memories clustered during the early years of their life, consistent with a reminiscence bump, whereas healthy controls also reported memories dated to later lifetime periods. Our results suggest that probing for personal memories of important public events may serve as a powerful cue for detailed episodic memories in AD.

Direct retrieval as a theory of involuntary autobiographical memories: evaluation and future directions.

I evaluate the conception of direct retrieval as originally formulated in the Self-Memory System model (Conway & Pleydell-Pearce [2000]. The construction of autobiographical memories in the self-memory system. Psychological Review, 107(2), 261-288. https://doi.org/10.1037/0033-295X.107.2.261). In the hierarchical memory organisation proposed in the Self-Memory System model, direct retrieval is described as a bottom-up associative process. While its theoretical role within this model is clear, systematic empirical examination of direct retrieval, viewed as a natural and observable phenomenon, has been hampered by inconsistent operationalisations. Here, I suggest that direct retrieval should be treated as a theoretical concept, aiming at explaining the phenomenon of involuntary (spontaneously arising) autobiographical memories. I evaluate predictions derived from the concept of direct retrieval against findings on involuntary autobiographical memories obtained over the past 25 years. Most of these predictions are consistent with the evidence, notably, the enhanced episodic specificity and constructive nature of involuntary autobiographical memories. However, the theory also has critical limitations. It did not predict the frequent occurrence of involuntary recollections in daily life, exceeding the prevalence of voluntary memories. Additionally, it overlooked the early emergence of spontaneously arising event memories in ontogenesis and their presence in other species, such as great apes. Future advancements of the Self-Memory System model should integrate evolutionary perspectives to address these limitations.

Self-reported sensibility to bodily signals predicts individual differences in autobiographical memory: an exploratory study.

Recent theoretical perspectives have advanced that autobiographical memory processes are supported by interoception, the perception of internal bodily sensations. Yet, this relationship remains largely underexplored. The present study addressed this critical gap in the literature by systematically investigating the association between self-reported Interoceptive Sensibility and various individual differences measures of autobiographical memory. In Study 1, using a correlational approach in a large sample of participants (N = 247), we identified significant correlations between standardised measures of interoception and the general experience of autobiographical memory and the frequency of involuntary mental time travel. These associations remained significant even after controlling for potential confounding factors in terms of age, gender, and trait affectivity, underscoring their robustness. Study 2 replicated and extended the associations identified in Study 1 in another large participant sample (N = 257), further validating them by accounting for the potential confounding effect of well-being. Our findings demonstrate that individuals' ability to perceive and understand bodily signals robustly relates to how they experience autobiographical memories. By adopting an exploratory approach based on individual differences, our results provide novel and concrete insights into the association between interoception and autobiographical memory, providing a strong foundation for future investigations into the causal mechanisms connecting these two constructs.

Measuring narrative identity: rater coding versus questionnaire-based approaches.

Narrative identity - how individuals narrate their lived and remembered past - is usually assessed via independent rater coding, but new methods relying on self-report have been introduced. To test the assumption that different methods assess aspects of the same underlying construct, studies measuring similar components of narrative identity with different methods are needed. However, such studies are surprisingly rare. To begin to fill this gap, the present study compared the narrative variables, temporal coherence, causal coherence, and thematic coherence, measured via rater coding of participants' self-generated narratives of the remembered past and via subscales of the self-report measure Awareness of Narrative Identity Questionnaire (ANIQ). The results showed that the ANIQ subscales did not correlate significantly with their corresponding rater-coded dimension, and that the ANIQ subscales were generally unrelated to the other rater-coded dimensions. Furthermore, an exploratory factor analysis demonstrated that the ANIQ subscales loaded together on a factor that did not include any rater-coded variables. The findings suggest that the narrative variables share little empirical overlap when assessed via the ANIQ and rater coding of self-generated narratives.

To ask or not to ask: strategic recall, but not spontaneous recall, decreases by the passage of time in 46-month-olds' memory of a unique event.

Children's ability to intentionally recall events lessens with temporal distance to the occurrence. However, little is known about the effects of retention time on memories that emerge spontaneously. We examined spontaneous and strategic retrieval in eighty-one 46-month-olds' memory of a lab event after 1 week (the 1-week Condition) versus 43 weeks (the 43-week Condition) in a between-subjects design, using well-established procedures (Krøjgaard et al., in Consciousness and Cognition 55(91): 105, 2017). While spontaneous recall showed no significant effect of retention, the children's strategic recall was negatively affected: even though the children overall still remembered the event, the children in the 43-week Condition showed reduced voluntary recall compared to the children in the 1-week Condition. To our knowledge, this is the first study to assess spontaneous recall after such a long retention interval. The findings add to existing evidence of two modes of retrieval in early childhood and are of both theoretical and forensic relevance.

On the importance of contextual cues for spontaneous recall in 35- and 46-month-old children.

Recent evidence shows that returning to the same distinct lab setting after 1 week triggers spontaneous memories in 35- and 46-month-old children. However, it remains unclarified which specific cues are triggering spontaneous recall. We report two experiments in which distinct contextual cues were altered between encoding and test. In Experiment 1 (N = 76), the color of the box containing the event props was changed. Despite this change, the children still showed spontaneous recall. In Experiment 2 (N = 77), a more radical change was employed as the children returned to a completely differently furnished, and novel room. The children still engaged in spontaneous recall, although less frequently. Importantly, when comparing the number of children having spontaneous recollections, only about half as many children in Experiment 2 as in Experiment 1 exhibited spontaneous memories. These results underscore the importance of an encoding-retrieval match for spontaneous episodic memory in young children.

Afterlife future thinking: imagining oneself beyond death.

Studies on episodic future thinking (the capacity to simulate possible experiences in one's personal future) have ignored future thinking that extends beyond death. We here examined personal afterlife projections in comparison with autobiographical memories and future projections in Thai (Study 1) and American (Study 2) samples. Participants reported all three types of events and rated their characteristics. In both studies, the characteristics of afterlife events were rated lower than those of memories and future events. Participants who believed in the afterlife generally rated afterlife events higher than non-believers and those who were uncertain, although this effect was most pronounced in Study 2. The content of afterlife events followed religious beliefs in the afterlife, and the majority of afterlife events were expected to take place immediately after death. The findings show that afterlife thoughts demonstrate characteristics that are comparable to memories and episodic future thoughts, and are shaped by religious beliefs.

Individual differences in autobiographical memory predict the tendency to engage in spontaneous thoughts.

Individual differences in autobiographical memory have become a research area of interest, but little is known about its associations with other individual differences dimensions, such as the tendency to engage in spontaneous cognition. We report two studies examining individual differences in autobiographical memory, as measured by the Autobiographical Recollection Test (ART), in relation to eight trait-like measures of spontaneous thought and, in Study 2, also a measure of fantasy proneness. In Study 1, the ART correlated positively and systematically with six out of eight measures of spontaneous thought, even when controlling for age, gender, and trait positive and negative affect. The two exceptions concerned spontaneous thoughts specifically related to attentional deficits. Study 2 replicated these findings and extended them to a measure of fantasy proneness. The findings demonstrate that people who generally consider their autobiographical memories to be vivid, detailed, relevant, and coherent, report a higher tendency to engage in various forms of spontaneous cognition, including positive constructive daydreaming, spontaneous mind wandering, involuntary mental time travel, and vivid and immersive fantasy. We discuss these findings in terms of the role autobiographical memory plays in spontaneous thoughts.

Remembering a life: an examination of open-ended life stories and the reminiscence bump in patients with Alzheimer's disease.

Autobiographical memory impairments are prominent in Alzheimer's disease (AD). Yet, life narratives of AD patients are scarcely examined. Here, twenty-one older adults diagnosed with probably AD and 22 age-matched healthy controls told their life story, and dated the events mentioned in these narratives. AD patients provided significantly fewer life story memories overall, but the proportion of memories with reference to specific events did not differ between groups. Patients included fewer negative events in their life story, while the emotional tone of narratives was similar across groups. Impairments were found on most structural aspects, with patients' narratives being less coherent and ending somewhere in the past, while no differences were seen for life story beginnings. Both groups showed a peak in remembered events dated to young adulthood, consistent with a reminiscence bump. However, in contrast to controls, patients displayed a steep drop in life story memories after the age of 30. For both groups, a high proportion of memories within the bump period were of life script events, consistent with the idea that the life script helps to structure the recall of personal life story memories, thus suggesting that AD patients still benefit from the retrieval support of this semantic structure.

Autobiographical memory and the self on the psychosis continuum: investigating their relationship with positive- and negative-like symptoms.

Autobiographical memory is severely impaired in schizophrenia, but previous work has largely treated both as unitary concepts. Here, we examined how various dimensions of autobiographical memory relate to different aspects of psychosis. Participants were recruited from the general population (Study 1, N = 264) and a university subject pool (Study 2, N = 305). We examined different measures of autobiographical memory and self (i.e., involuntary memory, autobiographical recollection, self-knowledge and self-awareness), at the trait level in Study 1 and both trait and state levels in Study 2, as a function of positive-and negative-like symptoms of psychosis. Across both studies, positive and negative dimensions of psychosis were found to be related to an increase in involuntary memories (i.e., the spontaneous recall of personal memories), and to lower self-concept clarity and insight. Positive and negative dimensions of psychosis correlated differently with autobiographical recollection characteristics, measured at both trait (Studies 1 and 2) and state levels (Study 2). Positive-like symptoms (in particular hallucination-proneness) showed a stronger and more consistent pattern of correlations than negative-like symptoms. These findings call for a dimensional approach to the relationship between autobiographical memory and psychosis symptoms in clinical and non-clinical individuals, to better understand the breakdown of autobiographical memory in the psychopathology of psychosis.

Self- and other-focused autobiographical memories of life story events across cultures.

Autobiographical memory and personal life stories are typically conceived as memories about the self. However, personal life stories often contain information about important events from other people's lives. Sometimes those memories become an important part of our own life stories, illuminating the role that other people play in remembering our personal past. In this study, we examined the extent to which memories of important life story events are self-focused (e.g., I moved to Japan) or other-focused (e.g., My child graduated from college). Participants from Mexico, Greenland, China, Denmark and the United States recalled and dated seven autobiographical memories of important personal life story events. Participants also rated the memories for importance and emotional valence. The memories were coded as self- or other-focused. Participants recalled mainly self-focused memories. However, Danish and Chinese participants recalled about 20% other-focused memories. Danish participants recalled negative events about their parents, whereas Chinese participants recalled positive events about their children. Self-focused and other-focused memories differed in their emotional valence and lifespan distribution, but not in importance. The findings show that individuals remember other-focused memories and also incorporate them into their own personal life stories. Conceptual implications for autobiographical memory are discussed.

Narrative identity does not predict well-being when controlling for emotional valence.

Narrative identity refers to a person's internalized and evolving life story. It is a rapidly growing research field, motivated by studies showing a unique association with well-being. Here we show that this association disappears when controlling for the emotional valence of the stories told and individuals' general experience of autobiographical memory. Participants (N = 235) wrote their life story and completed questionnaires on their general experience of autobiographical memory and several dimensions of well-being and affect. Participants' life stories were coded for standard narrative identity variables, including agency and communion. When controlling for emotional valence of the life story, the general experience of autobiographical memory was a significant predictor of most well-being measures, whereas agency was a predictor of one variable only and communion of none. These findings contradict the claim of an incremental association between narrative identity and well-being, and have important theoretical and practical implications for narrative identity as an outcome measure in interventions.

Sleeping poorly is robustly associated with a tendency to engage in spontaneous waking thought.

We spend approximately-one third of our lives sleeping, and spontaneous thoughts dominate around 20-50% of our waking life, but little is known about the relation between the two. Studies examining this relationship measured only certain aspects of sleep and certain forms of spontaneous thought, which is problematic given the heterogeneity of both conceptions. The scarce literature suggests that disturbed sleep and the frequency of spontaneous waking thoughts are associated, however this could be caused by shared variance with negative affect. We report a comprehensive survey study with a large range of self-reported sleep and spontaneous thought measures (N = 236), showing that poorer sleep quality, more daytime-sleepiness, and more insomnia symptoms, consistently predicted higher tendencies to engage in disruptive spontaneous thoughts, independently of trait negative affect, age and gender. Contrarily, only daytime sleepiness predicted positive-constructive daydreaming. Findings underscore the role of sleep for spontaneous cognition tendencies.

Sleep well, mind wander less: A systematic review of the relationship between sleep outcomes and spontaneous cognition.

Despite an upsurge of research on spontaneous cognition, little is known about its associations with sleep-related outcomes. This systematic review, following PRISMA guidelines, examined the relationship between sleep and spontaneous thoughts, across different definitions and measurements of sleep outcomes and spontaneous cognition, and a diversity of methodologies. Twenty-one articles with survey and/or experimental designs were identified. Self-reported disturbed sleep-comprising poor sleep quality, more insomnia symptoms, more daytime sleepiness and a tendency towards eveningness-and experimentally induced sleep deprivation were associated with a tendency to engage in disruptive mind wandering and daydreaming, but not positive-constructive daydreaming. Findings regarding circadian fluctuation in spontaneous thoughts were mixed and inconclusive. This systematic review bridges the gap between the sleep and spontaneous cognition research by contributing to the understanding of potential psychological and cognitive mechanisms of spontaneous cognition, as well as by elucidating the emotional and cognitive consequences of disturbed sleep.

Distinct environmental cues trigger spontaneous recall of past events in 3- and 4-year-old children even after long delays.

Verbally reported long-term memory for past events typically improves with age. However, such findings are based exclusively on studies, where children are directly asked to recall. The present study showed that when 3- (n = 113, 59 girls) and 4-year-olds (n = 113, 62 girls), predominantly White, were brought back to a distinct laboratory-setting after either 1-, 4.5-, or 13-weeks, children-regardless of age and delay-spontaneously recalled the distinct event experienced at their first visit (all Cohen's ds > 1.00). Meanwhile, the oldest children outperformed the youngest when being asked directly to retrieve the event ( η p 2 > . 088 ). These findings suggest that spontaneous retrieval facilitated by distinct environmental cues provides a short-cut to young children's event memories.

Deficient semantic knowledge of the life course-Examining the cultural life script in Alzheimer's disease.

Cultural life scripts are culturally transmitted semantic knowledge of the expected order and timing of major transitional events in a prototypical life course. This cognitive schema has been shown to serve as an important mnemonic template that guides retrieval from autobiographical memory, especially for positive and important life events. Autobiographical memory deficits are one of the earliest and most prominent symptoms in Alzheimer's disease (AD). However, no studies have examined cultural life scripts in patients with AD, despite semantic memory impairments being reported even in the early stages of the disease. The aim of the present work was to assess life-script knowledge in older adults diagnosed with AD, particularly in terms of knowledge for the content of life-script events and the timing and temporal order of these events. Twenty-one older adults diagnosed with AD and 22 healthy age-matched controls completed the standard life-script task (Berntsen & Rubin, 2004, Memory & Cognition, 32[3], 427-442). We found that while AD patients produced significantly fewer life-script events, the content of the generated events were quite consistent with those of the controls and the cultural norms. AD patients were particular impaired with regard to the normative timing and order of life-script events, suggesting that these components of the cultural life script are more vulnerable to cognitive decline. The findings are discussed in relation to impaired script knowledge and semantic memory deficits in AD.

How suspense and surprise enhance subsequent memory: the case of the 2016 United States Presidential Election.

We examined whether the retroactive enhancement effect - i.e., improved memory accuracy for event details occurring before a surprising moment - would be present in participants' memory for details in their private lives following a surprising and suspenseful public event. To equate event type across participants, we selected when they first learned the outcome of the 2016 US Presidential Election. Participants self-divided into those who viewed the outcome as positive, negative, or neutral, while we experimentally divided them into those whose memory was assessed 6 or 12 months post-election. We assessed their accuracy for details surrounding the election and their phenomenological experience of learning the outcome, including emotional tension, our operationalisation of suspense. We found participants' memory characteristics were strongly related to their level of tension and shock, irrespective of valence. We also observed uniformly high accuracy regarding details about the weather participants experienced in their ZIP codes on election day. While these results intimated about the presence of retroactive enhancement, Experiment 2 examined the effect more directly by comparing participants' memory for the 2016 Election with two other politically-relevant events that provoked less tense reactions. The results revealed retroactive enhancement is dependent upon experiencing a surprising moment amidst a suspenseful event.

The reconstructive nature of involuntary autobiographical memories.

Influential clinical theories propose that parts of traumatic or stressful events are stored in an unprocessed, purely perceptual form, which is inaccessible for voluntary retrieval but may spontaneously return to consciousness involuntarily in response to matching cues. This leads to perceptually vivid, and largely veridical involuntary memories of the traumatic scene, remembered with the original emotions and from the same vantage point as during the event. Several lines of evidence contradict this position. First, involuntary memories are not more veridical than memories retrieved deliberately. Second, involuntary memories for trauma-related events are not more frequently remembered with the original first-person perspective, and individuals with PTSD do not report more first-person involuntary memories than individuals without PTSD. Third, involuntary memories of stressful moments that are subjectively experienced as repetitive do not come to mind in a fixed and unchangeable form. Fourth, involuntary memories do not have privileged access to the most emotional moments (so-called hotspots) of a stressful event and the content and choice of hotspots change over time. Fourth, although involuntary memories are associated with enhanced emotional impact, this does not imply reactivation of the original emotion. We conclude that involuntary memories, although effortless, are products of (re)constructive processes.

To mention or not to mention? The inclusion of self-reported most traumatic and most positive memories in the life story.

Many theories on Posttraumatic Stress Disorder (PTSD) make assumptions on the relationship between PTSD and centrality of traumas to the life story and identity. Although the Centrality of Event Scale (CES) is a popular measure of centrality of personally experienced events to the life story, no studies have examined whether self-rated "central" events are mentioned, when individuals recount their lives. It is also unknown if mentioning specific event types in the life story is related to psychological health or life story coherence. We asked 386 adults to write their life stories, nominate their most traumatic and positive events, rate these events on the CES, and complete measures of PTSD and depression. Two-thirds of the sample mentioned at least one event, with the positive event being mentioned twice as often as the trauma. Mentioned events were more central than non-mentioned events. Participants who mentioned their trauma scored higher on symptoms of PTSD and depression than participants who only mentioned their positive event, but did not write less coherent life stories. Further, death- and illness-related traumas were mentioned more often than accidents and disasters. Findings are discussed in relation to theories on trauma memory in PTSD.

Are memories of sexual trauma fragmented? A post publication discussion among Richard J. McNally, Dorthe Berntsen, Chris R. Brewin and David C. Rubin.

Following the publication of his article on whether memories of trauma in sexual assault victims are fragmented (McNally, 2022), McNally moderated a discussion between Chris R. Brewin and David C. Rubin/Dorthe Berntsen whose perspectives on memory fragmentation were cited by McNally. The discussion clarified their contrasting viewpoints on this controversy.