Eirini Mavritsaki - Academia.edu (original) (raw)
Papers by Eirini Mavritsaki
Empirical mode decomposition is an adaptive signal processing method that when applied to a broad... more Empirical mode decomposition is an adaptive signal processing method that when applied to a broadband signal, such as that generated by turbulence, acts as a set of band-pass filters. This process was applied to data from time-resolved, particle image velocimetry measurements of subsonic jets prior to computing the second-order, two-point, space-time correlations from which turbulent phase velocities and length and time scales could be determined. The application of this method to large sets of simultaneous time histories is new. In this initial study, the results are relevant to acoustic analogy source models for jet noise prediction. The high frequency portion of the results could provide the turbulent values for subgrid scale models for noise that is missed in large-eddy simulations. The results are also used to infer that the cross-correlations between different components of the decomposed signals at two points in space, neglected in this initial study, are important.
NestMC is a new multicompartment neural network simulator currently under development as a collab... more NestMC is a new multicompartment neural network simulator currently under development as a collaboration between the Simulation Lab Neuroscience at the Forschungszentrum Jülich, the Barcelona Supercomputing Center and the Swiss National Supercomputing Center. NestMC will enable new scales and classes of morphologically detailed neuronal network simulations on current and future supercomputing architectures. A number of "many-core" architectures such as GPU and Intel Xeon Phi based systems are currently available. To optimally use these emerging architecture new approaches in software development and algorithm design are needed. NestMC is being written specifically with performance for this hardware in mind (Figure 1); it aims to be a flexible platform for neural network simulation while keeping interoperability with models and workflows developed for NEST and NEURON. The improvements in performance and flexibility in themselves will enable a variety of novel experiments, but the design is not yet finalized, and is driven by the requirements of the neuroscientific
European survey study to examine associations between technostress factors, academic motivation, ... more European survey study to examine associations between technostress factors, academic motivation, and mental health in students.
Computational Modelling in Behavioural Neuroscience, 2009
Europe’s Journal of Psychology
The COVID-19 pandemic raised many challenges for university staff and students, including the nee... more The COVID-19 pandemic raised many challenges for university staff and students, including the need to work from home, which resulted in a greater reliance on technology. We collected questionnaire data from university students (N = 894) in three European countries: Greece, Italy, and the United Kingdom. Data were collected between 7th April 2020 and 19th June 2020, representing a period covering the first lockdown and university closures in these countries and across Europe generally. We tested the hypotheses that technology-related stressors (techno-overload, work-home conflict, techno-ease, techno-reliability, techno-sociality, and pace of change) would be associated with anxiety and depressive symptoms, and that coping styles (problem-focused, emotion-focused, and avoidance) would mediate these relationships. Results showed significant positive associations between techno-overload, work-home conflict and anxiety and depressive symptoms, and significant negative associations betwe...
Frontiers in Psychology
IntroductionResearch has well demonstrated that the pandemic entailed several implications among ... more IntroductionResearch has well demonstrated that the pandemic entailed several implications among university students worldwide in terms of increased use of Information and Communication Technologies (ICTs), technostress, disruptions in academic goals and motivation processes, and growing psychological suffering. Responding to the new research need to go in-depth into the processes linking technostress and motivation dimensions to inform current research/interventions, the present study aimed to explore the direct effects of perceived Technostress dimensions (Techno-Overload, Work-Home Conflict, Pace of Change, Techno-Ease, Techno-Reliability, and Techno-Sociality) and Academic Motivation dimensions (Amotivation, Intrinsic, and Extrinsic Motivation dimensions) on students' perceived levels of Anxiety/Depression and test the potential indirect effect (mediating role) of Academic Motivation dimensions in the associations between Technostress and psychological health conditions.Meth...
International Journal of Psychology
Cultural differences in visual perceptual learning (VPL) could be attributed to differences in th... more Cultural differences in visual perceptual learning (VPL) could be attributed to differences in the way that people from individualistic and collectivistic cultures preferentially attend to local objects (analytic) or global contexts (holistic). Indeed, individuals from different cultural backgrounds can adopt distinct processing styles and learn to differentially construct meaning from the environment. Therefore, the present work investigates if cross-cultural differences in VPL can vary as a function of holistic processing. A shape discrimination task was used to investigate whether the individualistic versus collectivistic backgrounds of individuals affected the detection of global shapes embedded in cluttered backgrounds. Seventy-seven participants-including Asian (collectivistic background) and European (individualistic background) students-were trained to discriminate between radial and concentric patterns. Singelis's self-construal scale was also used to assess whether differences in learning could be attributed to independent or interdependent self-construal. Results showed that collectivists had faster learning rates and better accuracy performance than individualists following training-thereby reflecting their tendency to attend holistically when learning to extract global forms. Further, we observed a negative association between independent self-construal-which has previously been linked to analytic processing-with performance. This study provides insight into how socio-cultural backgrounds affect VPL.
Computational Modelling in Behavioural Neuroscience, 2009
a computational modelling study
Water, 2021
Communication campaigns to promote the importance of water as a vital but limited resource have e... more Communication campaigns to promote the importance of water as a vital but limited resource have evolved in many ways. Nowadays, the resources, techniques and skills to deliver effective communication campaigns are far greater than ever before. Over the past decades, there has been a significant body of research towards improving water conservation campaign communication but with limited success in promoting more resilient behaviours on behalf of water consumers. While the media and technology have rapidly evolved and awareness among consumers may have increased, this has not been sufficient to make the communication effective in changing behaviour. Communications to promote resilience among consumers need to reach a wide audience, capture audiences’ attention, build awareness and motivate water consumers to consume water sustainably. This represents a subject in need of further theoretical and conceptual investigation. This research reviews various approaches to effective communicat...
Biotropica, 2021
This study aims to quantify the effect of different soil fauna on forest litter decomposition pro... more This study aims to quantify the effect of different soil fauna on forest litter decomposition processes under natural conditions in the Maolan karst area of southwest China. Leaf litters of two typical evergreen species (CG, Cyclobalanopsis glauca and KS, Kmeria septentrionalis) were selected to conduct a field decomposition experiment using the mesh bags with three different apertures (5, 2, and 0.03 mm). Mass remaining and nutrient variation in the litterbags were determined for one year at 3‐month intervals. The results showed that litter decomposition rate in different mesh sizes litterbags were in the order of 5 mm >2 mm >0.03 mm. Soil macrofauna had a significant effect on litter decomposition in the two types of litter and the mixture of the two. The most considerable mesofauna effect was found in the KS litter, which is 36.5% ascribed by the lowest C/N ratio (high quality). Soil mesofauna had a more significant effect on N, which was time‐dependent. Moreover, the fauna richness and abundance were affected by the decomposition time but not limited by the litter quality. This study illustrated that soil macrofauna has a significant influence on litter decomposition. The effect of mesofauna on litter mass loss and nitrogen release are determined by litter quality in the subtropical karst forest ecosystems.
BMC Neuroscience, 2017
Recent studies have demonstrated the capacity of hippocampal sequences associated with theta osci... more Recent studies have demonstrated the capacity of hippocampal sequences associated with theta oscillation, to encode P160 The effect of progressive degradation of connectivity between brain areas on the brain network structure
, image used for 'Optimal voting rules for two-stage committees' by Dr Colin Rowat. Photo by Flic... more , image used for 'Optimal voting rules for two-stage committees' by Dr Colin Rowat. Photo by Flickr user Mukumbura; used under Creative Commons Attribution license for Chunk Learning and Move Prompting Making Moves in Chess by Dr Andrew Cook.
UK PubMed Central (UKPMC) is an archive of life sciences journal literature.
Abstracts of magnesium research at BCU and Meridian Technologies Ltd, supplementary material to t... more Abstracts of magnesium research at BCU and Meridian Technologies Ltd, supplementary material to the BCU Magnesium symposium 20 July 2017
Springer Series in Cognitive and Neural Systems, 2019
Alzheimer’s disease is a neurodegenerative condition that affects the brain’s cognitive processes... more Alzheimer’s disease is a neurodegenerative condition that affects the brain’s cognitive processes as well as many other functions for daily life. It is the commonest cause for dementia in older people and can take several years or decades from the time its pathology starts to the time the full clinical symptoms are developed. One of the cognitive processes affected in Alzheimer’s disease is attention. Depletion in attentional processes is linked to acetylcholine function, and attention deficit underlies many cognitive dysfunctions in Alzheimer’s disease. In this work, we are employing computational modelling to provide a neural bio-mechanistic account linking acetylcholine depletion and decreased attentional performance. Although previous research has modelled the decrease of acetylcholine, how neurotransmitter depletion is associated with behavioural impairments in Alzheimer’s disease remains unclear. We employed a spiking Search over Time and Space (sSoTS) model to simulate attent...
The current work aims to unveil the neural circuits underlying visual search over time and space ... more The current work aims to unveil the neural circuits underlying visual search over time and space by using a model-based analysis of behavioural and fMRI data. It has been suggested by Watson and Humphreys [31] that the prioritization of new stimuli presented in our visual field can be helped by the active ignoring of old items, a process they termed
Journal of Vision
Cross-cultural studies have shown that independence in individualistic societies is associated wi... more Cross-cultural studies have shown that independence in individualistic societies is associated with analytic systems of thoughts, whereas collectivistic societies which place greater emphasis on interdependence are generally predisposed to holistic thinking (Masuda & Nisbett, 2011; Bang, 2015). Further, cultural identity has been shown to effect picture perception and cognitive processes (Nisbett & Miyamoto, 2005). For example, Asians were
Empirical mode decomposition is an adaptive signal processing method that when applied to a broad... more Empirical mode decomposition is an adaptive signal processing method that when applied to a broadband signal, such as that generated by turbulence, acts as a set of band-pass filters. This process was applied to data from time-resolved, particle image velocimetry measurements of subsonic jets prior to computing the second-order, two-point, space-time correlations from which turbulent phase velocities and length and time scales could be determined. The application of this method to large sets of simultaneous time histories is new. In this initial study, the results are relevant to acoustic analogy source models for jet noise prediction. The high frequency portion of the results could provide the turbulent values for subgrid scale models for noise that is missed in large-eddy simulations. The results are also used to infer that the cross-correlations between different components of the decomposed signals at two points in space, neglected in this initial study, are important.
NestMC is a new multicompartment neural network simulator currently under development as a collab... more NestMC is a new multicompartment neural network simulator currently under development as a collaboration between the Simulation Lab Neuroscience at the Forschungszentrum Jülich, the Barcelona Supercomputing Center and the Swiss National Supercomputing Center. NestMC will enable new scales and classes of morphologically detailed neuronal network simulations on current and future supercomputing architectures. A number of "many-core" architectures such as GPU and Intel Xeon Phi based systems are currently available. To optimally use these emerging architecture new approaches in software development and algorithm design are needed. NestMC is being written specifically with performance for this hardware in mind (Figure 1); it aims to be a flexible platform for neural network simulation while keeping interoperability with models and workflows developed for NEST and NEURON. The improvements in performance and flexibility in themselves will enable a variety of novel experiments, but the design is not yet finalized, and is driven by the requirements of the neuroscientific
European survey study to examine associations between technostress factors, academic motivation, ... more European survey study to examine associations between technostress factors, academic motivation, and mental health in students.
Computational Modelling in Behavioural Neuroscience, 2009
Europe’s Journal of Psychology
The COVID-19 pandemic raised many challenges for university staff and students, including the nee... more The COVID-19 pandemic raised many challenges for university staff and students, including the need to work from home, which resulted in a greater reliance on technology. We collected questionnaire data from university students (N = 894) in three European countries: Greece, Italy, and the United Kingdom. Data were collected between 7th April 2020 and 19th June 2020, representing a period covering the first lockdown and university closures in these countries and across Europe generally. We tested the hypotheses that technology-related stressors (techno-overload, work-home conflict, techno-ease, techno-reliability, techno-sociality, and pace of change) would be associated with anxiety and depressive symptoms, and that coping styles (problem-focused, emotion-focused, and avoidance) would mediate these relationships. Results showed significant positive associations between techno-overload, work-home conflict and anxiety and depressive symptoms, and significant negative associations betwe...
Frontiers in Psychology
IntroductionResearch has well demonstrated that the pandemic entailed several implications among ... more IntroductionResearch has well demonstrated that the pandemic entailed several implications among university students worldwide in terms of increased use of Information and Communication Technologies (ICTs), technostress, disruptions in academic goals and motivation processes, and growing psychological suffering. Responding to the new research need to go in-depth into the processes linking technostress and motivation dimensions to inform current research/interventions, the present study aimed to explore the direct effects of perceived Technostress dimensions (Techno-Overload, Work-Home Conflict, Pace of Change, Techno-Ease, Techno-Reliability, and Techno-Sociality) and Academic Motivation dimensions (Amotivation, Intrinsic, and Extrinsic Motivation dimensions) on students' perceived levels of Anxiety/Depression and test the potential indirect effect (mediating role) of Academic Motivation dimensions in the associations between Technostress and psychological health conditions.Meth...
International Journal of Psychology
Cultural differences in visual perceptual learning (VPL) could be attributed to differences in th... more Cultural differences in visual perceptual learning (VPL) could be attributed to differences in the way that people from individualistic and collectivistic cultures preferentially attend to local objects (analytic) or global contexts (holistic). Indeed, individuals from different cultural backgrounds can adopt distinct processing styles and learn to differentially construct meaning from the environment. Therefore, the present work investigates if cross-cultural differences in VPL can vary as a function of holistic processing. A shape discrimination task was used to investigate whether the individualistic versus collectivistic backgrounds of individuals affected the detection of global shapes embedded in cluttered backgrounds. Seventy-seven participants-including Asian (collectivistic background) and European (individualistic background) students-were trained to discriminate between radial and concentric patterns. Singelis's self-construal scale was also used to assess whether differences in learning could be attributed to independent or interdependent self-construal. Results showed that collectivists had faster learning rates and better accuracy performance than individualists following training-thereby reflecting their tendency to attend holistically when learning to extract global forms. Further, we observed a negative association between independent self-construal-which has previously been linked to analytic processing-with performance. This study provides insight into how socio-cultural backgrounds affect VPL.
Computational Modelling in Behavioural Neuroscience, 2009
a computational modelling study
Water, 2021
Communication campaigns to promote the importance of water as a vital but limited resource have e... more Communication campaigns to promote the importance of water as a vital but limited resource have evolved in many ways. Nowadays, the resources, techniques and skills to deliver effective communication campaigns are far greater than ever before. Over the past decades, there has been a significant body of research towards improving water conservation campaign communication but with limited success in promoting more resilient behaviours on behalf of water consumers. While the media and technology have rapidly evolved and awareness among consumers may have increased, this has not been sufficient to make the communication effective in changing behaviour. Communications to promote resilience among consumers need to reach a wide audience, capture audiences’ attention, build awareness and motivate water consumers to consume water sustainably. This represents a subject in need of further theoretical and conceptual investigation. This research reviews various approaches to effective communicat...
Biotropica, 2021
This study aims to quantify the effect of different soil fauna on forest litter decomposition pro... more This study aims to quantify the effect of different soil fauna on forest litter decomposition processes under natural conditions in the Maolan karst area of southwest China. Leaf litters of two typical evergreen species (CG, Cyclobalanopsis glauca and KS, Kmeria septentrionalis) were selected to conduct a field decomposition experiment using the mesh bags with three different apertures (5, 2, and 0.03 mm). Mass remaining and nutrient variation in the litterbags were determined for one year at 3‐month intervals. The results showed that litter decomposition rate in different mesh sizes litterbags were in the order of 5 mm >2 mm >0.03 mm. Soil macrofauna had a significant effect on litter decomposition in the two types of litter and the mixture of the two. The most considerable mesofauna effect was found in the KS litter, which is 36.5% ascribed by the lowest C/N ratio (high quality). Soil mesofauna had a more significant effect on N, which was time‐dependent. Moreover, the fauna richness and abundance were affected by the decomposition time but not limited by the litter quality. This study illustrated that soil macrofauna has a significant influence on litter decomposition. The effect of mesofauna on litter mass loss and nitrogen release are determined by litter quality in the subtropical karst forest ecosystems.
BMC Neuroscience, 2017
Recent studies have demonstrated the capacity of hippocampal sequences associated with theta osci... more Recent studies have demonstrated the capacity of hippocampal sequences associated with theta oscillation, to encode P160 The effect of progressive degradation of connectivity between brain areas on the brain network structure
, image used for 'Optimal voting rules for two-stage committees' by Dr Colin Rowat. Photo by Flic... more , image used for 'Optimal voting rules for two-stage committees' by Dr Colin Rowat. Photo by Flickr user Mukumbura; used under Creative Commons Attribution license for Chunk Learning and Move Prompting Making Moves in Chess by Dr Andrew Cook.
UK PubMed Central (UKPMC) is an archive of life sciences journal literature.
Abstracts of magnesium research at BCU and Meridian Technologies Ltd, supplementary material to t... more Abstracts of magnesium research at BCU and Meridian Technologies Ltd, supplementary material to the BCU Magnesium symposium 20 July 2017
Springer Series in Cognitive and Neural Systems, 2019
Alzheimer’s disease is a neurodegenerative condition that affects the brain’s cognitive processes... more Alzheimer’s disease is a neurodegenerative condition that affects the brain’s cognitive processes as well as many other functions for daily life. It is the commonest cause for dementia in older people and can take several years or decades from the time its pathology starts to the time the full clinical symptoms are developed. One of the cognitive processes affected in Alzheimer’s disease is attention. Depletion in attentional processes is linked to acetylcholine function, and attention deficit underlies many cognitive dysfunctions in Alzheimer’s disease. In this work, we are employing computational modelling to provide a neural bio-mechanistic account linking acetylcholine depletion and decreased attentional performance. Although previous research has modelled the decrease of acetylcholine, how neurotransmitter depletion is associated with behavioural impairments in Alzheimer’s disease remains unclear. We employed a spiking Search over Time and Space (sSoTS) model to simulate attent...
The current work aims to unveil the neural circuits underlying visual search over time and space ... more The current work aims to unveil the neural circuits underlying visual search over time and space by using a model-based analysis of behavioural and fMRI data. It has been suggested by Watson and Humphreys [31] that the prioritization of new stimuli presented in our visual field can be helped by the active ignoring of old items, a process they termed
Journal of Vision
Cross-cultural studies have shown that independence in individualistic societies is associated wi... more Cross-cultural studies have shown that independence in individualistic societies is associated with analytic systems of thoughts, whereas collectivistic societies which place greater emphasis on interdependence are generally predisposed to holistic thinking (Masuda & Nisbett, 2011; Bang, 2015). Further, cultural identity has been shown to effect picture perception and cognitive processes (Nisbett & Miyamoto, 2005). For example, Asians were