Linsey Raymaekers

Lasting False Beliefs and Their Behavioral Consequences

False beliefs and memories can affect peoples attitudes, at least in the short term. But can they produce real changes in behavior? This study explored whether falsely suggesting to subjects that they had experienced a food-related event in their childhood would lead to a change in their behavior shortly after the suggestion and up to 4 months later. We falsely suggested to 180 subjects that, as children, they had gotten ill after eating egg salad. Results showed that, after this manipulation, a significant minority of subjects came to believe they had experienced this childhood event even though they had initially denied having experienced it. This newfound autobiographical belief was accompanied by the intent to avoid egg salad, and also by significantly reduced consumption of egg-salad sandwiches, both immediately and 4 months after the false suggestion. The false suggestion of a childhood event can lead to persistent false beliefs that have lasting behavioral consequences.

Cognitive Mechanisms Underlying Recovered-Memory Experiences of Childhood Sexual Abuse

People sometimes report recovering long-forgotten memories of childhood sexual abuse. The memory mechanisms that lead to such reports are not well understood, and the authenticity of recovered memories has often been challenged. We identified two subgroups of people reporting recovered memories of childhood sexual abuse. These subgroups differed dramatically in their cognitive profiles: People who recovered memories of abuse through suggestive therapy exhibited a heightened susceptibility to the construction of false memories, but showed no tendency to underestimate their prior remembering. Conversely, people who recovered memories of abuse spontaneously showed a heightened proneness to forget prior incidences of remembering, but exhibited no increased susceptibility to false memories. This double dissociation points to mechanisms that underlie recovered-memory experiences and indicates that recovered memories may at times be fictitious and may at other times be authentic.

Autobiographical integration of trauma memories and repressive coping predict post-traumatic stress symptoms in undergraduate students

What differentiates those who are able to adapt well to adverse life events (i.e., persons who are resilient) from those who are not (e.g., persons who develop post-traumatic stress symptoms)? Previous work suggests that enhanced autobiographical integration of trauma memories is associated with more severe post-traumatic stress symptoms. Extending this line of work, the present study looked at whether the integration of trauma memories, repressive coping and cognitive reactivity are related to post-traumatic stress symptomatology following negative life events among otherwise healthy young adults (N = 213). Results show that while enhanced integration of trauma memories and high levels of dissociation are related to elevated levels of post-traumatic stress, people who generally engage in repressive coping report fewer post-traumatic stress symptoms.

Survival processing in times of stress.

Recent studies have found that processing information according to an evolutionary relevant (i.e., survival) scenario improves its subsequent memorability, potentially as a result of fitness advantages gained in the ancestral past. So far, research has not revealed much about any proximate mechanisms that might underlie this so-called survival processing advantage in memory. Intriguingly, research has shown that the memorability of stressful situations is enhanced via the release of stress hormones acting on brain regions involved in memory. Since survival situations habitually involve some degree of stress, in the present study, we investigated whether stress serves as a proximate mechanism to promote survival processing. Participants rated words for their relevance to either a survival or a neutral (moving) scenario after they had been exposed to a psychosocial stressor or a no-stress control condition. Surprise retention tests immediately following the rating task revealed that survival processing and acute stress independently boosted memory performance. These results therefore suggest that stress does not serve as a proximate mechanism of the survival processing advantage in memory.

Developmental trends in different types of spontaneous false memories: implications for the legal field

In an emerging area of memory research, it is becoming apparent that one particular type of false memory, called spontaneous false memory, follows a developmental trajectory that is the opposite of what is commonly assumed in false memory research - that is, spontaneous false memories are more likely to occur in adults than in children. The present study focused on developmental trends of different types of spontaneous false memories. Specifically, in the current study, 6-8 year-olds, 10-12 year-olds, and adults were presented with two methods to induce spontaneous false memories: (i) semantically related word lists that are commonly used to evoke spontaneous false memories [i.e, Deese-Roediger-McDermott (DRM) paradigm]; and (ii) a video in which related details were not shown but were presented during a recognition task. The results showed that children were more likely to form false memories than adults in the video false memory paradigm, whereas DRM false memories were more evident in adults than in children. Furthermore, we found that on a general level, DRM false memories were positively related to video spontaneous false memories. We explain that stimuli that contain obvious themes attenuate or even reverse developmental trends in spontaneous false memories.

Autobiographical memory specificity among people with recovered memories of childhood sexual abuse

Individuals who report to have recovered memories of childhood sexual abuse (CSA) almost by definition believe that these memories were previously inaccessible for them. We examined whether poor autobiographical memory specificity for all kinds of events (i.e., events not necessarily related to CSA) may underlie such impressions of amnesia. Thus, we examined whether people who report recovered memories of CSA (n=44) would exhibit more difficulty retrieving specific autobiographical memories compared to people who never forgot their abuse experiences (continuous memory group; n=42) and people without a history of abuse (controls; n=26). The standard Autobiographical Memory Test (AMT) was administered to these 3 groups along with measures of depression and posttraumatic stress disorder symptomatology. Controls were significantly better at retrieving specific autobiographical memories relative to individuals with continuous and recovered CSA memories, who did not differ from each other. Thus, reduced autobiographical memory specificity was not particularly pronounced in people with recovered memories of CSA. Poor autobiographical memory specificity is unlikely to explain the impression of amnesia reported by this group.

Recovered memories of childhood sexual abuse: Current findings and their legal implications

Recent research on recovered memories of childhood sexual abuse has shown that there are at least two types of recovered memory experiences: those that are gradually recovered within the context of suggestive therapy and those that are spontaneously recovered, without extensive prompting or explicit attempts to reconstruct the past. By focusing on well-known imperfections of human memory, we were able to find differing origins for these recovered memory experiences, with people recovering memories through suggestive therapy being more prone to forming false memories, and with people reporting spontaneously recovered memories being more prone to forgetting prior incidences of remembering. Moreover, the two types of recovered memory reports are associated with differences in corroborative evidence, suggesting that memories recovered spontaneously, outside of suggestive therapy, are more likely to correspond to genuine abuse events. In this paper, we summarize recent research on recovered memories and we argue that these scientific findings should be applied in the justice system, but also in clinical practice.

The longevity of adaptive memory: Evidence for mnemonic advantages of survival processing 24 and 48 hours later

Prior studies have convincingly demonstrated that survival-related processing of information enhances its subsequent retention. This phenomenon, known as the survival recall advantage, generalises to other stimuli, memory domains, and research populations, thereby underscoring its reliability. As previous studies used only short retention intervals between survival processing and the memory test, an important yet hitherto unanswered issue is whether this effect persists over time. The present experiment therefore examined whether survival processing also produces mnemonic benefits when retention is tested after longer delay periods. Participants (N =81) rated the relevance of words according to a survival and a moving scenario, and were then randomly assigned to the typical immediate (3-minute delay) retention test condition or conditions that included a 24- or 48-hour interval between survival processing and memory testing. In each of these conditions survival processing led to higher surprise free recall and recognition rates than processing words according to the moving scenario. Thus this study provides evidence that illustrates the longevity of survival processing advantages on memory performance.

Hervonden herinneringen: de stand van zaken

SamenvattingOnderzoek laat zien dat er twee typen van hervonden herinneringen bestaan. In het ene type worden de misbruikherinneringen geleidelijk opgehaald, veelal in de context van therapie. In het andere type worden de herinneringen spontaan – buiten de therapeutische context – hervonden. Voor het laatste type zijn vaker ondersteunende verklaringen van andere personen te vinden dan voor het eerste type. De twee types hebben ook een ander cognitief profiel. Bij de spontane herinneringen onderschatten mensen vaak hun eerdere herinneringen aan echte episodes. Bij de in therapie hervonden herinneringen vertonen mensen vaak een uitgesproken kwetsbaarheid voor pseudoherinneringen. Wij betogen daarom dat spontaan hervonden herinneringen vaker naar authentieke gebeurtenissen verwijzen, terwijl in therapie hervonden herinneringen vaker gebaseerd zijn op een gevaarlijke combinatie van suggestieve interventies en een neiging tot bronverwarring. Het onderscheid tussen de twee typen hervonden herinneringen kan juristen en getuige-deskundigen helpen om de betrouwbaarheid van zulke herinneringen in te schatten. Ook kan de kennis over deze twee categorieën nuttig zijn voor clinici, met name als het gaat om de gevaarlijke combinatie die wij hiervoor aanduidden.SummariesRecovered memories; the state of affairs Recent research had identified two types of recovered memory experiences. In one type, the abuse recollections are gradually recalled, often prompted by suggestive therapeutic techniques. In the other type, abuse memories are recovered spontaneously, outside the course of suggestive therapy. We found that the latter can be corroborated by statements made by others much more often than the first type of recovered memories. The two types are also characterised by a different cognitive profile. People with spontaneously recovered memories often underestimate their prior remembrances about real episodes. People who have recovered their memories during suggestive therapy often exhibit a pronounced vulnerability to create pseudo memories. We therefore argue that spontaneously recovered memories more often reflect genuine events while those memories recovered during the course of suggestive therapy are often driven by a dangerous combination of suggestive interventions and a proneness to source monitoring. The distinction between the two types of recovered memory experiences could help jurists and expert witnesses to evaluate the reliability of such memories. Furthermore, the knowledge about these two categories could also be useful for clinicians, specifically the indication regarding the dangerous combination mentioned above.

Stress, stress-induced cortisol responses, and eyewitness identification performance

Abstract In the eyewitness identification literature, stress and arousal at the time of encoding are considered to adversely influence identification performance. This assumption is in contrast with findings from the neurobiology field of learning and memory, showing that stress and stress hormones are critically involved in forming enduring memories. This discrepancy may be related to methodological differences between the two fields of research, such as the tendency for immediate testing or the use of very short (1–2 hours) retention intervals in eyewitness research, while neurobiology studies insert at least 24 hours. Other differences refer to the extent to which stress‐responsive systems (i.e., the hypothalamic–pituitary–adrenal axis) are stimulated effectively under laboratory conditions. The aim of the current study was to conduct an experiment that accounts for the contemporary state of knowledge in both fields. In all, 123 participants witnessed a live staged theft while being exposed to a laboratory stressor that reliably elicits autonomic and glucocorticoid stress responses or while performing a control task. Salivary cortisol levels were measured to control for the effectiveness of the stress induction. One week later, participants attempted to identify the thief from target‐present and target‐absent line‐ups. According to regression and receiver operating characteristic analyses, stress did not have robust detrimental effects on identification performance. Copyright