Involuntary Retrieval Research Articles

Single-pulse Transcranial Magnetic Stimulation Affects Working-memory Performance via Posterior Beta-band Oscillations.

A single pulse of TMS (spTMS) during the delay period of a double serial retrocuing working-memory task can briefly rescue decodability of an unprioritized memory item (UMI). This physiological phenomenon, which is paralleled in behavior by involuntary retrieval of the UMI, is carried by the beta frequency band, implicating beta-band dynamics in priority coding in working memory. We decomposed EEG data from 12 participants performing double serial retrocuing with concurrent delivery of spTMS using Spatially distributed PhAse Coupling Extraction. This procedure decomposes the scalp-level signal into a set of discrete coupled oscillators, each with a component strength that can vary over time. The decomposition revealed a diversity of low-frequency components, a subset of them strengthening with the onset of the task, and the majority declining in strength across the trial, as well as within each delay period. Results with spTMS revealed no evidence that it works by activating previously "silent" sources; instead, it had the effect of modulating ongoing activity, specifically by exaggerating the within-delay decrease in strength of posterior beta components. Furthermore, the magnitude of the effect of spTMS on the loading strength of a posterior beta component correlated with the disruptive effect of spTMS on performance, a pattern also seen when analyses were restricted to trials with "UMI-lure" memory probes. Rather than reflecting the "activation" of a putatively "activity silent" UMI, these results implicate beta-band dynamics in a mechanism that distinguishes prioritized from unprioritized, and suggest that the effect of spTMS is to disrupt this code.

Proust and involuntary retrieval.

Proust was undoubtedly a pioneer in exploring cognitive processes engaged in memory. The analysis of the episode of the madeleine, as well as the study of Proust's statements on the goals of his work, clearly reveal the visionary side of this author. Long before several concepts entered into mainstream scientific thought, Proust proposed, among other things, that recall was a reconstruction, that a sensory cue could provoke a memory recall, and that we should distinguish between voluntary and involuntary memory. Through numerous episodes of "involuntary reminiscence" scattered throughout his work, Proust illustrates a particular form of autobiographic memory recall: a recall that does not involve consciousness and whose starting point is an emotion provoked by a specific cue. This recall, which leads, according to Proust, to a more intense revival of the memory than voluntary recall, has only reached prominence in cognitive science more than 80 years later. Additionaly, Proust underlined the determinant role that emotion may have in this particular form of recall. On the other hand, studies on animals have shown that the presentation of a retrieval cue could induce emotional reactions followed by a facilitation of the memory retrieval associated with the cue. The existence of these data, which support Proust's proposals, should encourage the neuroscience community to further explore, in humans and animals, this form of cue elicited emotion that initiated involuntary recall of autobiographical memory.

What do laypeople believe about the voluntary and involuntary retrieval of memories?

People can remember experiences from their past, either deliberately or spontaneously—that is, memories can be voluntarily or involuntarily retrieved. People tend to report that their voluntary and involuntary memories have different properties. But people’s reports about their mental phenomena can be open to bias or mistaken, shaped in part by their lay beliefs about those phenomena. Therefore, we investigated what laypeople believe about the properties of their voluntarily- and involuntarily-retrieved memories—and how well those beliefs align with the literature. We adopted a funnelled approach, progressively giving subjects more information about the kinds of retrievals of interest and asking them about the typical properties of those retrievals. We found that laypeople have some beliefs that align well with the literature, and others that align less well. Our findings suggest that researchers should consider how their experimental conditions may shape their subjects’ reports about voluntary and involuntary memories.

Déjà vu and involuntary autobiographical memories as two distinct cases of familiarity in patients with Alzheimer's disease.

The continuum between involuntary autobiographical memories and déjà vu, as proposed by Barzykowski and Moulin, can be better defined by considering research on autobiographical retrieval in patients with Alzheimer's disease. Although autobiographical retrieval in patients with Alzheimer's disease can generally be associated with a sense of familiarity, involuntary retrieval can trigger an autonoetic experience of retrieval in these patients.

The cognitive characteristics of music-evoked autobiographical memories: Evidence from a systematic review of clinical investigations.

In healthy adults, autobiographical memories (AMs) evoked by music appear to have unique cognitive characteristics that set them apart from AMs evoked by other cues. If this is the case, we might expect music cues to alleviate AM deficits in clinical disorders. This systematic review examines music-evoked autobiographical memories (MEAMs) in clinical populations, focusing on cognitive characteristics, and whether MEAMs differ from AMs evoked by other stimuli. We identified 15 studies featuring participants with Alzheimer's disease (AD), behavioral variant - Frontotemporal dementia (bv-FTD), acquired brain damage, and depression. We found that music evokes AMs in these disorders, and that familiar music was more likely to evoke AMs. Compared with healthy controls, AD participants had a relative advantage for MEAMs over picture-evoked AMs. People with damage to the medial prefrontal cortex showed preserved access to MEAMs in terms of frequency, but a relative disadvantage regarding the episodic richness for MEAMs, but not for memories cued by pictures, compared to controls. Participants with bv-FTD had fewer AMs evoked after both music and pictures than healthy controls. Across conditions, MEAMs were generally specific and retrieved fast, suggesting little retrieval effort. MEAMs were also positive, except in depression, where as many negative as positive AMs were produced. These findings suggest several underlying cognitive and affective mechanisms of MEAMs, including anxiety reduction, increased fluency, music-evoked emotions, reminiscence, and involuntary retrieval, and that these might be moderated by musical abilities and memory for music. In conclusion, MEAMs appear to be relatively well preserved, especially in AD. This article is categorized under: Psychology > Memory.

Effects of inhibitory control capacity and cognitive load on involuntary past and future thoughts: A laboratory study

The present study focused on involuntary thoughts about personal past events (i.e., involuntary autobiographical memories; IAMs), and involuntary thoughts about future events and plans (i.e., involuntary future thoughts; IFTs). The frequency of these involuntary thoughts is influenced by cognitive demands of ongoing activities, but the exact underlying mechanism(s) has yet to be revealed. The present study tested two possible explanations: (1) the special inhibitory mechanism switches on when one is engaged in attentionally demanding activities; (2) different levels of cognitive load interfere with cue-noticing that act as triggers for IAMs and IFTs. We report a study with pre-selected groups of participants that differed in terms of their individual level of inhibitory control capacity (high vs. low), and completed both standard and attentionally demanding versions of a laboratory vigilance task with irrelevant cue-words to trigger IAMs and IFTs, and random thought-probes to measure their frequency. To examine the level of incidental cue-noticing, participants also completed an unexpected cue-recognition task. Despite large differences between groups in inhibitory control capacity, the number of IFTs and IAMs, reported in the attentionally demanding condition, was comparable. In addition, high cognitive load reduced the number of IAMs, but not IFTs. Finally, the recognition of incidental cues encountered in the vigilance task was reduced under high cognitive load condition, indicating that poor cue-noticing may be the main underlying mechanism of cognitive load effect rather than the lack of inhibitory resources needed to suppress involuntary retrieval. This and other possible mechanisms and avenues for future research are discussed.

Investigating the role of involuntary retrieval in music-evoked autobiographical memories

Music is a particularly salient autobiographical memory cue. Prior work has indicated that autobiographical memories evoked by music are more episodically rich than those evoked by other sensory cues. One explanation for this effect could be that music evokes autobiographical memories in a more involuntary manner than other cues. Here, we investigated the role of involuntary retrieval in music-evoked autobiographical memories. Results indicated that, regardless of intentionality, music-evoked autobiographical memories were more episodically rich and contained more perceptual details than face-evoked memories. That is, even when directly comparing involuntary music-evoked memories to involuntary face-evoked memories, there was still a consistent difference in episodic richness between memories evoked by the two cue types. This suggests that it is not the involuntary nature of music-evoked memories alone that drives this difference, but that the difference in episodic richness between cue types seems at least partially to depend on other stimulus features.

Increased alpha suppression with age during involuntary memory retrieval.

Recent work suggests that while voluntary episodic memory declines with age, involuntary episodic memory, which comes to mind spontaneously without intention, remains relatively intact. However, the neurophysiology underlying these differences has yet to be established. The current study used electroencephalography (EEG) to investigate voluntary and involuntary retrieval in older and younger adults. Participants first encoded sounds, half of which were paired with pictures, the other half unpaired. EEG was then recorded as they listened to the sounds, with participants in the involuntary group performing a sound localization cover task, and those in the voluntary group additionally attempting to recall the associated pictures. Participants later reported which sounds brought the paired picture to mind during the localization task. Reaction times on the localization task were slower for voluntary than involuntary retrieval and for paired than unpaired sounds, possibly reflecting increased attentional demands of voluntary retrieval and interference from reactivation of the associated pictures respectively. For the EEG analyses, young adults showed greater alpha event-related desynchronization (ERD) during voluntary than involuntary retrieval at frontal and occipital sites, while older adults showed pronounced alpha ERD regardless of intention. Additionally, older adults showed greater ERD for paired than unpaired sounds at occipital sites, likely reflecting visual reactivation of the associated pictures. Young adults did not show this alpha ERD memory effect. Taken together, these data suggest that involuntary memory is largely preserved with age, but this may be due to older adults' greater recruitment of top-down control even when demand for such control is limited.

Using Nostalgia Films to Stimulate Spontaneous Autobiographical Remembering in Alzheimer’s Disease

Autobiographical memory is severely impaired in Alzheimer’s disease (AD). However, previous research has focused primarily on voluntary memories—that is, memories retrieved deliberately following a request. Here we investigated the extent to which people with AD experience involuntary (spontaneous) autobiographical memories (IAMs), using a novel method to simulate involuntary retrieval in naturalistic settings. Twenty-one AD patients and 22 healthy controls viewed nostalgia films designed to elicit IAMs under two conditions: with or without prior reminiscence. AD patients expressed more IAMs and emotional reactions overall and showed higher physiological reactivity in response to the films than controls. Both groups verbalized more IAMs after having engaged in reminiscence prior to watching the film. The results provide novel evidence that AD patients frequently engage in involuntary remembering when viewing media content dated to their youth, suggesting that involuntary retrieval may act as an alternative route for accessing the personal past in AD.

Unraveling the role of retrieval deficits in autobiographical memory impairment in schizophrenia: A comparison of involuntary and voluntary autobiographical memories

Patients with schizophrenia show severe autobiographical memory impairment, thought to reflect retrieval deficits caused by executive dysfunction. However, prior research has focused exclusively on strategic (voluntary) retrieval, and ignored involuntary retrieval resulting from automatic and associative processes, involving minimal cognitive control. We report two studies with patients diagnosed with schizophrenia (Ns = 40 and 50 respectively) comparing their impairment in involuntary versus voluntary autobiographical memory. We use two different methodologies, not previously used in schizophrenia research: a naturalistic study involving real-life data and an experimental setup. Both studies consistently showed that involuntary and voluntary autobiographical memories were similarly impaired in schizophrenia. The absence of interaction effects between group and retrieval suggests that schizophrenic patients did not benefit from memory tasks involving little retrieval effort. These findings suggest that autobiographical memory impairment in schizophrenia are not caused by problems with self-initiated voluntary retrieval, but instead likely reflect encoding or binding deficits.

Trait Mindfulness and Emotion Regulation upon Autobiographical Memory Retrieval during Depression Remission

ObjectivesDepression is associated with both emotion dysregulation upon retrieval of autobiographical memories and low trait mindfulness. The present study raised the question of whether these processes are related to each other and whether they may reflect a cognitive-affective vulnerability in individuals at risk of depression. The study examined emotion regulation in response to involuntary and voluntary autobiographical memories during depression remission and explored how trait mindfulness relates to such emotion regulation.MethodsThe study employed a naturalistic design in which individuals with remitted depression (n = 35) and individuals with no history of depression (n = 32) completed a trait mindfulness measure and a structured memory diary where they rated state use of five emotion regulation strategies upon involuntary and voluntary autobiographical memory retrieval.ResultsIndividuals with remitted depression reported heightened brooding in response to autobiographical memories when memory retrieval occurred involuntarily, and trait mindfulness was low. Depression remission and higher trait mindfulness were independently associated with greater cognitive reappraisal efforts upon involuntary retrieval of autobiographical memories. Higher trait mindfulness predicted less memory suppression, irrespective of depression history and memory retrieval mode.ConclusionsThe findings suggest a vulnerability in emotional processing of autobiographical memories during depression remission that is dependent on mindfulness skill level and how memories come to mind.

Encoding and retrieval biases for health-related scenes in patients with severe health anxiety

ABSTRACTSevere health anxiety is a disorder characterised by excessive worries about harbouring or having a serious illness. The present study examines cognitive biases in evaluation and memory for health-related scenes in severe health anxiety in order to provide insights into the effect of these biases and the formation of illness intrusions in severe health anxiety. Twenty patients with severe health anxiety and 20 healthy participants completed a computerised task consisting of encoding, involuntary retrieval, voluntary retrieval and recognition of health-related, negative and neutral scenes. The results demonstrated that patients with severe health anxiety reported more negative emotional valence and greater physiological arousal to health-related scenes, both during encoding (ps < .031, > .09) and retrieval (ps < .044, ds > 0.18). Furthermore, in contrast to the comparison group, patients with severe health anxiety did not show shorter retrieval time for health-related scenes during involuntary compared with voluntary retrieval (p = .789, d = 0.08), possibly due to greater demands on emotion regulation during involuntary retrieval. The results suggest an important role for negative emotional valence and physiological arousal to health-related stimuli in severe health anxiety, and highlight how cognitive biases in evaluation and memory might be at play in this disorder.

Retrieval intentionality and forgetting: How retention time and cue distinctiveness affect involuntary and voluntary retrieval of episodic memories

Forgetting, understood as a measurable reduction in memory accessibility over time, has been studied extensively in episodic memory for more than 130 years. However, this research has typically focused on voluntary memory-that is, information retrieved intentionally. Few studies have examined forgetting in relation to involuntary memories-that is, memories coming to mind spontaneously with no preceding attempt at retrieval. The purpose of the present studies was to investigate the effects of cue distinctiveness and the passage of time on the accessibility of involuntary and voluntary memories for pictures of scenes. For both types of retrieval, we examined the frequency of correct memories after a few minutes, one day, and seven days; in Study 2, we also examined frequency after three days. Across both studies and both types of retrieval, distinct cues yielded better memory access than nondistinct cues, and memory frequency dropped systematically with increased retention time. At the shortest retention interval, voluntary retrieval led to greater memory access than involuntary retrieval, but after one week, this advantage had disappeared. The findings suggest that memories for events become more cue-dependent over time, which limits the beneficial effects of strategic search associated with voluntary retrieval at longer delays.

Long-Term Memory of Past Events in Great Apes

It has been claimed that the ability to recall personal past events is uniquely human. We review recent evidence that great apes can remember specific events for long periods of time, spanning months and even years, and that such memories can be enhanced by distinctiveness (irrespective of reinforcement) and follow a forgetting curve similar to that in humans. Moreover, recall is enhanced when apes are presented with features that are diagnostic of the event, consistent with notions of encoding specificity and cue overload in human memory. These findings are also consistent with the involuntary retrieval of past events in humans, a mode of remembering that is thought to be less cognitively demanding than voluntary retrieval. Taken together, these findings reveal further similarities between the way humans and animals remember past events and open new avenues of research on long-term memory in nonhuman animals.

The voluntary and involuntary retrieval of autobiographical memories: An investigation using a cue-word method

The voluntary and involuntary retrieval of autobiographical memories: An investigation using a cue-word method

Demonstrating Conceptual Clustering in Autobiographical Memory with Voluntary Recall Tasks: More Evidence for the Conceptual Organization View

Abstract Research on the nature of episodic memory organization has suggested that the dominant organizing principle among episodic memories is either conceptual organization, where memories cluster around the same content (e.g., memories about the people), or a type of temporal organization known as general events, where memories cluster around extended events (e.g., a holiday in London), repeated events (e.g., Sunday walks in the park), or causally related events (i.e., where one event leads to another). Because these opposing conclusions have been derived separately from involuntary or voluntary measures of autobiographical memory, Mace, Clevinger, and Martin (2010) hypothesized that involuntary retrieval processes and voluntary retrieval processes may be accessing episodic memories differentially, such that one produces high frequencies of conceptually clustered memories, whereas the other produces high frequencies of general event clustered memories. This study failed to find support for this hypothesis. In 2 experiments, 3 different types of voluntary retrieval tasks found that conceptually clustered memories were substantially more frequent than general event clustered memories. We argue that these results support the view that episodic memories are organized mainly conceptually.

Neural responses to emotional involuntary memories in posttraumatic stress disorder: Differences in timing and activity.

BackgroundInvoluntary memories are a hallmark symptom of posttraumatic stress disorder (PTSD), but studies of the neural basis of involuntary memory retrieval in posttraumatic stress disorder (PTSD) are sparse. The study of the neural correlates of involuntary memories of stressful events in PTSD focuses on the voluntary retrieval of memories that are sometimes recalled as intrusive involuntary memories, not on involuntary retrieval while being scanned. Involuntary memory retrieval in controls has been shown to elicit activity in the parahippocampal gyrus, precuneus, inferior parietal cortex, and posterior midline regions. However, it is unknown whether involuntary memories are supported by the same mechanisms in PTSD. Because previous work has shown that both behavioral and neural responsivity is slowed in PTSD, we examined the spatiotemporal dynamics of the neural activity underlying negative and neutral involuntary memory retrieval.MethodsTwenty-one individuals with PTSD and 21 non-PTSD, trauma-exposed controls performed an involuntary memory task, while undergoing a functional magnetic resonance imaging scan. Environmental sounds served as cues for well-associated pictures of negative and neutral scenes. We used a finite impulse response model to analyze temporal differences between groups in neural responses.ResultsCompared with controls, participants with PTSD reported more involuntary memories, which were more emotional and more vivid, but which activated a similar network of regions. However, compared to controls, individuals with PTSD showed delayed neural responsivity in this network and increased vmPFC/ACC activity for negative > neutral stimuli.ConclusionsThe similarity between PTSD and controls in neural substrates underlying involuntary memories suggests that, unlike voluntary memories, involuntary memories elicit similar activity in regions critical for memory retrieval. Further, the delayed neural responsivity for involuntary memories in PTSD suggests that factors affecting cognition in PTSD, like increased fatigue, or avoidance behaviors could do so by delaying activity in regions necessary for cognitive processing. Finally, compared to neutral memories, negative involuntary memories elicit hyperactivity in the vmPFC, whereas the vmPFC is typically shown to be hypoactive in PTSD during voluntary memory retrieval. These patterns suggest that considering both the temporal dynamics of cognitive processes as well as involuntary cognitive processes would improve existing neurobiological models of PTSD.

How intention and monitoring your thoughts influence characteristics of autobiographical memories.

Involuntary autobiographical memories come to mind effortlessly and unintended, but the mechanisms of their retrieval are not fully understood. We hypothesize that involuntary retrieval depends on memories that are highly accessible (e.g., intense, unusual, recent, rehearsed), while the elaborate search that characterizes voluntary retrieval also produces memories that are mundane, repeated or distant - memories with low accessibility. Previous research provides some evidence for this 'threshold hypothesis'. However, in almost every prior study, participants have been instructed to report only memories while ignoring other thoughts. It is possible that such an instruction can modify the phenomenological characteristics of involuntary memories. This study aimed to investigate the effects of retrieval intentionality (i.e., wanting to retrieve a memory) and selective monitoring (i.e., instructions to report only memories) on the phenomenology of autobiographical memories. Participants were instructed to (1) intentionally retrieve autobiographical memories, (2) intentionally retrieve any type of thought (3) wait for an autobiographical memory to spontaneously appear, or (4) wait for any type of thought to spontaneously appear. They rated the mental content on a number of phenomenological characteristics both during retrieval and retrospectively following retrieval. The results support the prediction that highly accessible memories mostly enter awareness unintended and without selective monitoring, while memories with low accessibility rely on intention and selective monitoring. We discuss the implications of these effects.

How the mind shapes action: Offline contexts modulate involuntary episodic retrieval.

Involuntary retrieval of previous stimulus-response episodes is a centerpiece of many theories of priming, episodic binding, and action control. Typically it is assumed that by repeating a stimulus from trial n-1 to trial n, involuntary retrieval is triggered in a nearly automatic fashion, facilitating (or interfering with) the to-be-executed action. Here we argue that changes in the offline context weaken the involuntary retrieval of previous episodes (the offline context is defined to be the information presented before or after the focal stimulus). In four conditions differing in cue modality and target modality, retrieval was diminished if participants changed the target selection criterion (as indicated by a cue presented before the selection took place) while they still performed the same task. Thus, solely through changes in the offline context (cue or selection criterion), involuntary retrieval can be weakened in an effective way.

Successfully controlling intrusive memories is harder when control must be sustained

ABSTRACTAfter unpleasant events, people often experience intrusive memories that undermine their peace of mind. In response, they often suppress these unwanted memories from awareness. Such efforts may fail, however, when inhibitory control demands are high due to the need to sustain control, or when fatigue compromises inhibitory capacity. Here we examined how sustained inhibitory demand affected intrusive memories in the Think/No-Think paradigm. To isolate intrusions, participants reported, trial-by-trial, whether their preceding attempt to suppress retrieval had triggered retrieval of the memory they intended to suppress. Such counter-intentional retrievals provide a laboratory model of the sort of involuntary retrieval that may underlie intrusive memories. Using this method, we found that longer duration trials increased the probability of an intrusion. Moreover, on later No-Think trials, control over intrusions suddenly declined, with longer trial durations triggering more relapses of items that had been previously been purged. Thus, the challenges of controlling retrieval appear to cause a decline in control over time, due to a change in state, such as fatigue. These findings raise the possibility that characteristics often true of people with psychiatric disorders – such as compromised sleep, and increased demand on control – may contribute to difficulties in suppressing intrusive memories.