Individual Memory Research Articles

Resilience to future floods through flood memory approach: An example from West Bengal, India

Managing flood situations is a combination of structural, non-structural, and socio-ecological approaches, where the latest includes an operative involvement from the local community, based on their experiences in past flood episodes. The instances of considering this indigenous knowledge and perception while planning for the flood mitigational framework in India are neither very popular a practice nor they are frequently exemplified - but while looking at the case studies from all over the world, this could be a powerful tool for gauging flood scenarios and the living with it. This paper aims to inspect the ways and approaches through which a local community memorizes the fury of floods, how this information can be put in a quantitative way, and can be realistically functioning for coping with future flood consequences. Focusing on the flood memory approach for community resilience, we present the findings of archival research, site-specific folklores and mythological stories (cultural), social methods, verbal methods, exploration of flood markers (structural), and campaigns and exhibitions (educational). A digital questionnaire-based survey was conducted in the most flood-suffering wards of the Kolkata Municipal Corporation area in West Bengal, and upon receiving the reactions, a Flood History Volatility Scale (FHVS) has been devised to test how the strength of an individual's flood memory varies due to some controlling factors. Based on the results obtained from memory work and perceiving the importance of community knowledge during the survey, a comprehensive flood risk management approach has been proposed for flood risk reduction and developing community resilience.

Effectiveness of exercise interventions, alone or in combination with dietary modifications, on working memory in overweight and obese individuals: A systematic review.

This systematic review aimed to establish the effectiveness of exercise interventions, alone or in combination with dietary modifications, on working memory (WM) in individuals living with overweight and obesity. A comprehensive literature search was conducted using the Scopus, PubMed, Springer-Link, RefSeek, and Cochrane Library databases to identify relevant publications up to January 18, 2024. Data on participants' characteristics, intervention settings, and key outcomes related to WM were extracted. The quality of the studies was assessed using the PEDro scale. A total of 15 articles met pre-established inclusion criteria, involving participants across nine countries with a range of 12-125 individuals and ages spanning from 6 to 80years old. Among the studies analyzed, 10 exclusively investigated exercise interventions, whereas five explored the combined effects. Notably, 70% of the exercise interventions (7 out of 10) exhibited positive improvements in WM. Likewise, 60% of the combined interventions (3 out of 5) demonstrated favorable enhancements in WM. No differences were found between the two protocols. Common features between the protocols were identified and described. Both protocols showed favorable and promising effects on WM in this clinical population. Nonetheless, the limited evidence addressing the combination of exercise and diet in the same research approach reduces the generalizability of the findings. This review offers valuable insights for future clinical and research applications in people with overweight and obesity.

Autobiographical memories in individuals with autism spectrum disorders: a systematic review

Autobiographical memories in individuals with autism spectrum disorders: a systematic review

Collective Memory as Sedimentations of Collective Experience: Phenomenological Analysis of Post-Soviet Europe

ABSTRACT In this essay, I argue that describing collective memory as a historical collective experience involving the sedimentation of experiences can help us understand the complexities in empirical cases. To demonstrate the explanatory power of this approach, I discuss actual cases of collective memory in post-Soviet European societies and communities, mainly in Estonia and among Ingrian Finns, using the concepts of collective experience and sedimentation. By combining these two concepts, I suggest that the same historical and contemporary political objects may appear very differently to different societies and communities. Therefore, to understand the social and political landscape of our continent, we need to understand the unique experiential nature of collective memory. While phenomenology has allegedly had difficulties in addressing collective memory, rather focusing on individual memory and time consciousness, my analysis demonstrates its potential to clarify the experiential patterns of collective memory and its relevance to historical and political studies.

The effects of musicality on brain network topology in the context of Alzheimer’s disease and memory decline

Abstract Music’s role in modulating brain structure, particularly in neurodegenerative contexts such as Alzheimer’s Disease (AD), has been increasingly recognized. While previous studies have hinted at the potential neuroplastic benefits of musical engagement and training, the mechanisms through which music impacts structural connectivity in neurodegenerative pathways remain underexplored. We aimed to examine the impact of music perception skills, active musical engagement, and musical training on structural connectivity in areas relating to memory, emotion, and learning in individuals with worsening memory impairment, investigating the potential neuroplastic effects of music. Employing diffusion tensor imaging (DTI) based structural connectivity and graph theoretical analysis, we investigated brain topological features in 78 participants aged 42 to 85 with a range of memory impairments. Participants were assessed for musical training, engagement, and perception skills. The study analyzed regional and local network topological metrics to examine the influence of musical activities on graph metrics, while controlling for stages of objective memory impairment (SOMI) and diagnosis, separately. This study aimed to elucidate the effects of musical perception skills, active musical engagement, and musical training on structural connectivity within memory, emotion, and learning-related brain areas in individuals with varying degrees of memory impairment. We found enhanced structural connectivity of the right hippocampus and the right posterior cingulate cortex was associated with stronger local network metrics, such as clustering coefficient and betweenness centrality, with increased music perception skills like melody and beat perception. Musical training specifically impacted the clustering coefficient of the right hippocampus and the node degree of the right mid cingulate gyrus. Active musical engagement influenced the eigenvector centrality of the right hippocampus. Furthermore, musical training was associated with enhanced global metrics, such as global efficiency and characteristic path length. Our study integrates diffusion magnetic resonance imaging (MRI) and graph theoretical analysis to reveal significant effects of musical activities on structural connectivity in key brain regions. The results highlight the potential of musical activities to serve as a non-invasive modulatory tool for cognitive resilience, especially in memory impairment and neurodegeneration contexts. These insights contribute to the understanding of delaying AD onset and aiding early-stage patients through music-based interventions, emphasizing the importance of musical engagement in maintaining cognitive and brain health.

Embryonic alcohol exposure alters cholinergic neurotransmission and memory in adult zebrafish

Alcohol is the most consumed addictive substance worldwide that elicits multiple health problems. Consumption of alcoholic beverages by pregnant women is of great concern because pre-natal exposure can trigger fetal alcohol spectrum disorder (FASD). This disorder can significantly change the embryo's normal development, mainly by affecting the central nervous system (CNS), leading to neurobehavioral consequences that persist until adulthood. Among the harmful effects of FASD, the most reported consequences are cognitive and behavioral impairments. Alcohol interferes with multiple pathways in the brain, affecting memory by impairing neurotransmitter systems, increasing the rate of oxidative stress, or even activating neuroinflammation. Here, we aimed to evaluate the deleterious effects of alcohol on the cholinergic signaling and memory in a FASD zebrafish model, using inhibitory avoidance and novel object recognition tests. Four months after the embryonic exposure to ethanol, the behavioral tests indicated that ethanol impairs memory. While both ethanol concentrations tested (0.5 % and 1 %) disrupted memory acquisition in the inhibitory avoidance test, 1 % ethanol impaired memory in the object recognition test. Regarding the cholinergic system, 0.5 % ethanol decreased ChAT and AChE activities, but the relative gene expression did not change. Overall, we demonstrated that FASD model in zebrafish impairs memory in adult individuals, corroborating the memory impairment associated with embryonic exposure to ethanol. In addition, the cholinergic system was also affected, possibly showing a relation with the cognitive impairment observed.

Everyday forgetfulness and memory complaints: A randomized controlled cognitive intervention study

ABSTRACT The results of Cognitive Intervention (CI) programs vary considerably; thus, it is helpful to assess the characteristics that enhance the effectiveness of these programs. Our objectives were to analyze the effectiveness of a multicomponent CI program called UMAM on cognitive performance, subjective memory, daily forgetfulness, and mood of individuals with memory complaints. Older adults with no cognitive impairment were separated into two groups by simple random assignment, a control (n = 111) and a parallel experimental (n = 115) group. They were assessed with an extended neuropsychological protocol and the Memory Failures of Everyday Questionnaire (MFE); evaluation pre and post intervention (at six months). We performed a multifactorial cognitive intervention (30 sessions) based on memory strategies, stimulation of cognitive processes, instruction in basic concepts about memory, interventions for everyday memory failures, and Metamemory. The Results showed improvements in objective measures, including logical memory (Cohen’s d = .30); processing speed (d = .26); phonological (d = .33) and semantic verbal fluency (d = .27); and general cognitive performance (d = .82) (all, p < .05). In subjective measures, we found improvements in mood state (d = .25) and everyday memory failures (MFE: d = .29) (all, p < .05). Several everyday failures improve: ‘Forgetting where you have put something,’ “finding a word that is on the ‘tip of the tongue,’ and ‘checking again if something has been done’ (all, p < .05). We found positive results when a cognitive process was directly trained intensely using exercises that focus on real life, with adaptive activities that aim to resolve everyday memory failures. This program has proved effective in promoting health and well-being and preventing cognitive impairment. Trial registration: Trial retrospectively registered on January 29, 2020; (ClinicalTrials.gov -NCT04245579).

Multi-step ozone concentration prediction model based on improved secondary decomposition and adaptive kernel density estimation

Accurately predicting ozone concentration is crucial for human pollution prevention and health protection. In recent years, decomposition ensemble frameworks have been widely applied to ozone concentration forecasting. However, due to the inefficiencies of secondary decomposition and insufficient emphasis on interval predictions, developing a stable and efficient model for ozone concentration prediction remains a challenging task. Therefore, this study proposes a hybrid model based on an improved secondary decomposition algorithm (ISD) and adaptive kernel density estimation (AKDE). The original sequences are initially decomposed and reconstructed using Complex Empirical Mode Decomposition (CEEMD) and K-means clustering based on sample entropy. Subsequently, Optimal Variational Mode Decomposition (OVMD) is employed to address the strong fluctuations in high-frequency components, followed by establishing individual Long Short-Term Memory (LSTM) prediction models for each component. The error correction model is then constructed by combining ISD and Gated circulation unit (GRU), culminating in uncertainty quantification using AKDE. Empirical analysis of the Beijing and Shanghai, China datasets shows that the average R2 of their multi-step forecasts are 0.9966 and 0.9938, respectively, which are significantly better than the baseline model.

Examining the time course of post collaborative benefits across word lists and prose passages.

In the current study, we investigated how long the effects of one single collaboration session continue to influence individual memory. Participants learned categorized word lists and prose passages individually, and then they were instructed to recall learned materials either collaboratively or individually. Following initial recall, participants completed an individual recall test after a delay of 5min, 48h, or 1week. On the initial recall test, we found that collaboration reduced recall of correct items on both word lists and prose passages (collaborative inhibition), and that collaboration reduced false recall on both word lists and prose passages (error correction). However, on the subsequent individual memory test after a delay, the pattern of post collaborative effects differed across veridical and false recall. For both word lists and prose passages, post collaborative benefits on correct recall lasted 1week. However, there were no lasting effects of error correction on subsequent false recall. These results suggest that the time course of post collaborative benefits can be long lasting, but they are selective to veridical recall. The results are explained by theories of reexposure and error correction.

Human cognitive system privileges processing over short-term storage: Asymmetry in working memory limitations.

The continuous flow of information in which we are immersed obliges our cognitive system to maintain accessible the relevant elements for the time necessary for their processing. The present study investigated how working memory balances the resource demands of this necessary storage in the face of demanding processing. In four experiments using a complex span task, we examined the residual performance in memory and processing of individuals who performed at their best in the other component. Reciprocal dual-task costs pointed toward a resource sharing between the two functions. However, whereas prioritizing processing almost abolished participants' memory performance, more than 60% of their processing capacities were preserved while maintaining memory performance at span. We argue that this asymmetry might be adaptive in nature. Working memory might have evolved as an action-oriented system in which short-term memory capacity is structurally limited to spare the resources needed for processing the information it holds. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

Reflective Paper

This article aims to investigate the changes that have been generated in archival systems through digitisation and the relevance of reactivating archives through artistic creation and specifically through printmaking. In this paper, I will present some projects from my practice to analyse the meaning of these new physical forms created from diverse archives. Digital technology has transformed the way we communicate and store information. Today’s images are virtual and fleeting; they slip from our memory, prompting the question of how much time we spend examining/absorbing an image. Why store thousands of images if we never revisit them? Archival information today is digitally stored and recorded, but can we access it and which archives do we choose to recreate? By revisiting material from the past, we might better understand our present. The relationship between archival materials and their stories as generators of new readings through artistic practice occupies a significant place in contemporary art research. In this study, I explore different photographic archives from my artistic practice, using graphic techniques that allow me to reflect on memory and its evanescence. My interest in working with these memories is related to the desire to share materials from the past and generate new relationships within our contemporary context. Working with various temporalities is an approach to understanding the functioning of both individual and collective memory

Post-collaborative benefits: A meta-analysis of the effect of collaboration on subsequent individual retrieval.

Collaboration has an essential role in memory, and how to appropriately use it to affect individual memory positively is a matter of concern. The meta-analysis generally assessed the effect of collaboration on subsequent individual retrieval, registered on the PROSPERO platform and adhering to the PRISMA guidelines, using the Web of Science, Science Direct, CNKI and WanFang databases with post-collaborative memory as the main subject, screened studies published up to December 31, 2023, a total of 64 studies with 101 effect sizes, including 13,398 participants from 11 countries. Heterogeneity test, sensitivity analysis, subgroup analysis and meta-regression analysis were performed on the included studies, while publication bias was assessed. The results found that collaboration improves subsequent individual retrieval memory more than individuals, and collaboration has a moderate facilitating effect on subsequent individual retrieval. Group size, material category, category size, collaboration phase, collaboration approach, task process and test method were among the moderating variables. The study emphasizes the role of collaboration in cognition and demonstrates the post-collaborative benefits. The conclusions are of value for developing methods to improve individual memory.

The relationship between working memory and sentence processing in individuals with Broca's aphasia

The aim of this study was to investigate the relationship between working memory and sentence processing in individuals with Broca's aphasia. To this end, the study was conducted on a sample of twenty (20) purposively selected individuals diagnosed with Broca's aphasia. A descriptive approach was adopted and two tests were used for data collection: the Baddeley Working Memory Test and the Sentence Processing Test. After data collection and statistical analysis, the results indicated a relationship between working memory and sentence processing in individuals with Broca's aphasia.

Foraging trail traffic rules: a new study method of trajectories of the harvester ants.

Harvester ants are one of the most extensively studied groups of ants, especially the group foraging ants, Messor barbarus (Linnaeus, 1767), which construct long-lasting trunk trails. Limited laboratory investigations have delved into head-on encounters along foraging trails involving workers moving in opposing directions, with fewer corresponding studies conducted in the natural environment. To address this gap, we devised an in-field experimental design to induce lane segregation on the foraging trunk trail of M. barbarus. Using an image-based tracking method, we analyzed the foraging behavior of this species to assess the costs associated with head-on encounters and to figure out the natural coexistence of outgoing and returning workers on a bidirectional route. Our results consistently reveal heightened straightness and speed in unidirectional test lanes, accompanied by an elevated foraging rate compared to bidirectional lanes. This suggests a potential impact of head-on collisions on foraging behavior, especially on foraging efficiency. Additionally, Kinematic analysis revealed distinct movement patterns between outbound and inbound flows, particularly low speed and sinuous trajectories of inbounding unladen workers. The study of encounter rates in two traffic systems hints at the plausible utilization of individual memory by workers within trails, underscoring the pivotal role of encounters in information exchange and load transfer.

Writing Rokeya: Muslim Women’s Life-Writing, Intergenerational Camaraderie and Activism in Twentieth Century Bengal

This paper showcases how the intersubjective is at the heart of women’s associations through Rokeya Sakhawat Hossain’s nurturance and support of younger colleagues in colonial Bengal. Arguing that individual memory can be constitutive of institutional history/identity, it focuses on Shamsunnahar Mahmud’s Rokeya Jibani (1937), the first ‘official’ biography of Rokeya, and Sufia Kamal’s memoir, Ekale Amader Kal (1988), both of which posit Rokeya as a foremother to women’s movements of the time and inscribe her within a silsila (chain) of activist women who are sources of inspiration to successive generations. It also explores how Mahmud and Kamal emulate and extend Rokeya’s paradigm of multigenerational sorority.

Hyperion: A Highly Effective Page and PC Based Delta Prefetcher

Hardware prefetching plays an important role in modern processors for hiding memory access latency. Delta prefetchers show great potential at the L1D cache level, as they can impose small storage overhead by recording deltas. Furthermore, local delta prefetchers, such as Berti, have been shown to achieve high L1D accuracy. However, there is still room for improving the L1D coverage of existing delta prefetchers. Our goal is to develop a delta prefetcher capable of achieving both high L1D coverage and accuracy. We explore delta prefetchers trained on various types of contextual information, ranging from coarse-grained to fine-grained, and analyze their L1D coverage and accuracy. Our findings indicate that training deltas based on the access histories of both PCs and memory pages for individual PCs and memory pages can lead to increased L1D coverage alongside high accuracy. Therefore, we introduce Hyperion, a highly efficient Page and PC-based delta prefetcher. In terms of the vital component of recording access histories, we implement three different structures and engage in a detailed discussion about them. Furthermore, Hyperion utilizes micro-architecture information (e.g., L1D hits or misses, PQ occupancy) and real-time L1D accuracy to dynamically adjust its issuing mechanism, further enhancing performance and L1D accuracy. Our results show that Hyperion achieves an L1D accuracy of 92.4% and an L1D coverage of 51.9%, along with an L2C coverage of 63.0% and an LLC coverage of 67.5% across a diverse range of applications, including SPEC CPU2006, SPEC CPU2017, GAP, and PARSEC, with a baseline of no prefetching. Regarding performance, Hyperion achieves a 50.1% performance gain, outperforming the state-of-the-art delta prefetcher Berti by 5.0% over baseline across all memory-intensive traces from the four benchmark suites.

Sound Presentation of the Silent History: Orature in Yvonne Vera’s The Stone Virgins

Abstract: In her novel The Stone Virgins , Zimbabwean author Yvonne Vera provides a model of orature writing by using sound in the interaction between literature and history as well as literature and politics. This essay will principally draw on the ideas of Kenyan author Ngugi Wa Thiong’o as well as Roland Barthes’ ideas about listening to analyze this effect. As a medium of oral tradition that carries traditional aesthetic and cultural values throughout the text, sound and its spatiotemporal framework establish an interpretative community among the author, the character, and the reader. In this community, silence—an extreme state of sound—and distorted sound highlight the individual memories of the suppressed people and form a contrast with the collective national memory that is put under the framework of the history of patriotism by official nationalist discourse. To reconstruct the suppressed history of the common people, Vera adopts the performance mechanism of orature by sound and thereby presents the inner monologue of the characters, which helps restore the subjectivity of the oppressed and sends out a call to the reader to participate in the reconstruction of a new history with the people as subjects. Vera’s sound presentation of the silenced Zimbabwean history is an important example of orature writing, showcasing a strong sense of historical responsibility among Zimbabwean writers and contributing to the formation of originality of African Europhone literature.

A reduction in self-reported confidence accompanies the recall of memories distorted by prototypes

When we recall a past event, we reconstruct the event based on a combination of episodic details and semantic knowledge (e.g., prototypes). Though prototypes can impair the veracity of recall, it remains unclear whether we are metacognitively aware of the distortions they introduce. To address this, we conducted six experiments in which participants learned object-colour/object-location pairs and subsequently recalled the colour/location when cued with the object. Leveraging unsupervised machine learning algorithms, we extracted participant-specific prototypes and embedded responses in two-dimensional space to quantify prototype-based distortions in individual memory traces. Our findings reveal robust and conceptually replicable evidence to suggest that prototype-based distortion is accompanied by a reduction in self-reported confidence - an implicit measure of metacognitive awareness. Critically, we find evidence to suggest that it is prototype-based distortion of a memory trace that undermines confidence, rather than a lack of confidence biasing reconstruction towards the use of prototypes. Collectively, these findings suggest that we possess metacognitive awareness of distortions embedded in our memories.

The processing of verbal memories after traumatic brain injury

Objective: Memory dysfunction is a persistent cognitive symptom following traumatic brain injury (TBI), negatively impacting capacity for independent living and productivity. Traditional scoring of neuropsychological memory tests does not allow for differentiation of specific impairments of encoding, consolidation and/or retrieval, or the potential impact of strategy deficits. Method: The current study examined performance of 142 moderate-to-severe TBI participants and 68 demographically matched healthy controls on the Rey Auditory Verbal Learning Test (RAVLT) using Item Specific Data Analysis (ISDA) and strategy use analyses. Results: Results revealed significantly greater impairments in encoding, consolidation, and retrieval in TBI participants, compared to controls. Encoding deficits significantly explained the most variance in the long-delayed recall of TBI participants, followed by consolidation, and then retrieval. Participants with TBI showed a reduced ability to spontaneously apply strategies during learning, evident in decreased subjective clusters and increased word omissions, compared to controls. No difference was found between groups in passive learning strategy application, shown through serial clustering. Spontaneous strategy measures both uniquely accounted for variance in the encoding ability of TBI participants. Conclusions: These findings highlight the potential value in using ISDA and strategy use measures to assess RAVLT results to better characterize individual memory profiles and inform rehabilitative interventions.

Social episodic memory in severe alcohol use disorder: Positive encoding bias and negative bias in accessibility of interpersonal information.

Alterations in higher-order social cognition are well documented in individuals with severe alcohol use disorder (SAUD). However, the basic mechanisms underpinning them are not well understood. This knowledge gap hampers the development of targeted therapeutic interventions. Here, we investigated whether individuals with SAUD show abnormalities in social episodic memory processes, which may represent relevant candidate mechanisms for alterations in social cognition. Recently detoxified patients with SAUD and matched healthy controls (HCs) completed two experimental tasks. We first used a Social Recognition Task in 40 SAUD patients and 40 HCs to measure the participants' ability to implicitly memorize the facial identity and emotion of novel interpersonal cues (i.e., dynamic facial expressions of anger and happiness). We then used a Social Memory Accessibility Task in 29 SAUD patients and 30 HCs) to measure participants' access to and fluency for already existing social memories by asking them to retrieve as many specific positive and negative interpersonal events as possible within equal time limits. In the Social Recognition Task, we found that, compared to HCs, patients with SAUD had a globally lower recognition performance for the facial identities of novel social stimuli, but a preserved bias toward positive information. Conversely, in the social memory accessibility task, patients showed greater access to and fluency for negative interpersonal memories than controls (no group differences were observed for positive ones), resulting in a negative accessibility bias. This exploration of episodic social memory in individuals with SAUD showed (1) a preserved bias for the encoding of positive versus negative novel social information, and (2) greater access to negative than positive interpersonal memories. These results enhance our understanding of socio-affective processing in individuals with SAUD and identify social memory alterations that may contribute to social cognition and interpersonal difficulties.