Edson Amaro

Edson Amaro
University of São Paulo | USP · Department of Radiology (FM)

MD,PhD

About

305
Publications
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6,727
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Introduction
Skills and Expertise
Additional affiliations
January 2008 - December 2012
January 2005 - December 2007

Publications

Publications (305)
Article
Full-text available
Chest radiographs allow for the meticulous examination of a patient’s chest but demands specialized training for proper interpretation. Automated analysis of medical imaging has become increasingly accessible with the advent of machine learning (ML) algorithms. Large labeled datasets are key elements for training and validation of these ML solution...
Article
Background: Repetitive peripheral nerve sensory stimulation (RPSS) is a potential add-on intervention to motor training for rehabilitation of upper limb paresis after stroke. Benefits of RPSS were reported in subjects in the chronic phase after stroke, but there is limited information about the effects of this intervention within the 1st weeks or...
Article
Brain signals allow a fundamental understanding of the mechanisms underpinning behavioral changes. Currently, standard signal staging of brain electrical activity relies on supervised processes. In this work, we propose an unsupervised data segmentation method based on time series complexity and in the cluster-weighted representation. Receiver oper...
Article
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This study evaluated how news with positive and negative content about COVID-19, as well as a relaxation pause, affect the emotional state. We also investigated the association between emotional state and practicing meditation/yoga, physical activity or having a mental disease. For that, a sample of 717 participants, recruited through social media,...
Article
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The procedures to be performed after sudden engine failure of a single-engine helicopter impose high workload on pilots. The maneuver to regain aircraft control and safe landing is called autorotation. The safety limits to conduct this maneuver are based on the aircraft height versus speed diagram, which is also known as "Dead Man’s Curve”. Flight-...
Article
There is compelling evidence showing that between-subject variability in several functional and structural brain features is sufficient for unique identification in adults. However, individuation of brain functional connectomes depends on the stabilization of neurodevelopmental processes during childhood and adolescence. Here, we aimed to (i) evalu...
Article
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Functional neuroimaging studies have highlighted the roles of three networks in processing language, all of which are typically left-lateralized: a ventral stream involved in semantics, a dorsal stream involved in phonology and speech production, and a more dorsal “multiple demand” network involved in many effortful tasks. As lateralization in all...
Article
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Background Graph theory (GT) is a mathematical field that analyses complex networks that can be applied to neuroimaging to quantify brain's functional systems in Parkinson's disease (PD) and essential tremor (ET). Objectives To evaluate the functional connectivity (FC) measured by the global efficiency (GE) of the motor network in PD and compare i...
Article
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A cause of mental distress during the COVID-19 pandemic is media exposure, which can impact health care professionals (HCPs) who must keep up to date with the statistics and procedures to fight the outbreak. This study aimed to evaluate the effects of listening to negative and positive news about COVID-19 pandemic and a relaxation pause audio. For...
Article
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COVER ILLUSTRATION Microstates are electrophysiological correlates of the coordinated activity of different neuronal assemblies, such that changes in topographies are representative of the overall modifications in neuronal activity dynamic over time. Given the evidence that specific microstates may be associated with perception and attention, in th...
Article
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Understanding decision‐making in complex and dynamic environments is relevant for designing strategies targeting safety improvements and error rate reductions. However, studies evaluating brain dynamics in realistic situations are scarce in the literature. Given the evidence that specific microstates may be associated with perception and attention,...
Article
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The Zika virus (ZIKV) attracted attention due to one striking characteristic: the ability to cross the placental barrier and infect the fetus, possibly causing severe neurodevelopmental disruptions included in the Congenital Zika Syndrome (CZS). Few years after the epidemic, the CZS incidence has begun to decline. However, how ZIKV causes a diversi...
Article
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Functional and structural MRI of prefrontal cortex (PFC) may provide putative biomarkers for predicting the treatment response to transcranial direct current stimulation (tDCS) in depression. A recent MRI study from ELECT-TDCS (Escitalopram versus Electrical Direct-Current Theror Depression Study) showed that depression improvement after tDCS was a...
Conference Paper
Background: There is limited information about effects of transcranial Direct Current Stimulation(tDCS), delivered within the first weeks post-stroke, on performance of the paretic upper limb and on connectivity between motor areas in the affected and unaffected hemispheres. Objectives: We compared changes in Fugl-Meyer Assessment of Motor Recovery...
Article
Previous research showed that mnemonic strategy training (MST) improves cognitive performance in people with MCI, and has been associated with increased brain activation consonant with the cognitive processes engaged by the training, such as, semantic memory, decision‐making, cognitive control, face processing and social cognition. Despite the grow...
Article
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Objective: To estimate coronavirus disease 2019-related information consumption and related implications for health care professionals (medical and nonmedical personnel) during the pandemic. Methods: A cross-sectional on-line survey was distributed to employees of a major health care institution located in São Paulo, Brazil between April 3 and Apr...
Article
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Significance: Dystonia is a dynamic and complex disorder. Real-time analysis of brain activity during motor tasks may increase our knowledge on its pathophysiology. Functional near-infrared spectroscopy (fNIRS) is a noninvasive method that enables the measurement of cortical hemo-dynamic activity in unconstrained environments. Aim: We aimed to expl...
Preprint
BACKGROUND In Brazil, and in other low-and-middle-income countries, the excess of interventions in childbirth has been associated with an increase in preterm and early term births, contributing to stagnant morbidity and mortality of mothers and babies. The fact that women often report a negative experience in vaginal childbirth, with physical pain...
Article
Background: In Brazil, and in other low-and-middle-income countries, the excess of interventions in childbirth has been associated with an increase in preterm and early term births, contributing to stagnant morbidity and mortality of mothers and babies. The fact that women often report a negative experience in vaginal childbirth, with physical pai...
Article
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Specific impairments of anticipatory postural adjustment (APA) during step initiation have been reported in patients with Parkinson’s disease (PD) and freezing of gait (FoG). Although APA disruption has been associated with FoG, there is scarce knowledge about its neural correlates. We sought to better understand the neural networks involved with A...
Article
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Abstract Introduction: Mnemonic strategy training (MST) has been shown to improve cognitive performance and increase brain activation in those with mild cognitive impairment (MCI). However, little is known regarding the effects of MST on functional connectivity (FC) at rest. The aim of the present study was to investigate the MST focused on face-na...
Article
Recent evidence suggests that gains in performance observed while humans learn a novel motor sequence occur during the quiet rest periods interleaved with practice (micro-offline gains, MOGs). This phenomenon is reminiscent of memory replay observed in the hippocampus during spatial learning in rodents. Whether the hippocampus is also involved in t...
Article
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Stroke lesions are frequently followed by cognitive impairments. Cognitive training is a non-pharmacological intervention that can promote neural compensation mechanisms and strategies to remediate cognitive impairments. The aims of this study were: (1) To investigate the cognitive performance, generalization effects, and neural correlates of seman...
Article
Objective: The aim of the study was to verify the effect of a virtual rehabilitation protocol for patients with Parkinson disease, primarily assessing striatal dopamine transporters and secondarily motor symptoms and quality of life. Design: Nineteen patients with Parkinson disease underwent an 8-wk virtual rehabilitation protocol using XBOX 360...
Article
Objective Research on potential brain circuit abnormalities in binge eating disorder (BED) is limited. Here, we assess white matter (WM) microstructure in obese women with BED. Method Diffusion tensor imaging data were acquired, and tract‐based spatial statistics used to examine WM in women with BED who were obese (n = 17) compared to normal‐weigh...
Article
Background Exercises with motor complexity induce neuroplasticity in individuals with Parkinson's disease (PD), but its effects on freezing of gait are unknown. The objective of this study was to verify if adapted resistance training with instability — exercises with motor complexity will be more effective than traditional motor rehabilitation — ex...
Preprint
BACKGROUND During the COVID-19 pandemic, the massive delivery of rapidly changing information about the science of the disease and its implications on everyday life can place high demands on individuals' abilities to deal with all this information. Professionals working in the healthcare sector are in the spotlight of this scenario. OBJECTIVE In t...
Article
The damage of glaucoma has been extensively evaluated at the level of retina and optic nerve head. Many advances have been shown in this field in the last decades. Recent studies have also proved degenerative changes in the brain involving intracranial optic nerve, lateral geniculate nucleus, and visual cortex. Moreover, these brain abnormalities a...
Article
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The individual's socioeconomic conditions are the most relevant to predict the quality of someone's health. However, such information is not usually found in medical records, making studies in the area difficult. Therefore, it is common to use composite indices that characterize a region socioeconomically, such as the Human Development Index (HDI)....
Article
Precis: Glaucoma patients presented a decreased occipital pole surface area in both hemispheres. Moreover, these parameters are independently correlated with functional and structural ocular parameters. Purpose: The purpose of this study was to evaluate structural brain abnormalities in glaucoma patients using 3-Tesla magnetic resonance imaging...
Article
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Background Although the availability and use of mobile mental health apps has grown exponentially in recent years, little data are available regarding their efficacy. Objective This study aimed to evaluate the effectiveness of an app developed to promote stress management and well-being among working women compared with a control app. Methods Fem...
Article
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The hippocampus is one of the earliest sites involved in the pathology of Alzheimer's disease (AD). Therefore, we specifically investigated the sensitivity and specificity of hippocampal volume and glucose metabolism in patients being evaluated for AD, using automated quantitative tools (NeuroQuant - magnetic resonance imaging [MRI] and Scenium - p...
Preprint
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Objective: to define an index that summarizes the main dimensions of the socioeconomic context for research purposes, evaluation and monitoring health inequalities. Methods: the index was created from the 2010 Brazilian Demographic Census, whose variables selection was guided by theoretical references for health studies, including seven socioeconom...
Article
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Quality of life is an important issue concerning people all over the world and affecting patients in the mental health field. When considering the potential neural links between quality of life and the brain, a brain network that comes into mind is the default mode network (DMN). Its architecture and function has been investigated in relation to va...
Article
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Complex network analysis applied to the resting brain has shown that sets of highly interconnected networks with coherent activity may support a default mode of brain function within a global workspace. Perceptual processing of environmental stimuli induces architectural changes in network topology with higher specialized modules. Evidence shows th...
Article
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Objective: To perform a quantitative analysis of the brain volume of elderly individuals in a population-based sample. Materials and methods: This was a radiological assessment and voxel-based quantitative analysis, with surface alignment, of 525 magnetic resonance imaging scans of individuals between 60 and 103 years of age who participated in...
Article
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Large-scale brain networks exhibit changes in functional connectivity during the aging process. Recent literature data suggests that Yoga and other contemplative practices may revert, at least in part, some of the aging effects in brain functional connectivity, including the Default Mode Network (DMN). The aim of this cross-sectional investigation...
Article
Research suggested accumulation of tau proteins might lead to the degeneration of functional networks. Studies investigating the impact of genetic risk for Alzheimer's disease (AD) on early brain connections might shed light on mechanisms leading to AD development later in life. Here, we aim to investigate whether the polygenic risk score for Alzhe...
Article
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The aims of the current study were to examine differences in brain responses to cognitive control in stressed and non-stressed women managers. Stress complaints are highly prevalent among active workers and play an important role in women managers mental health and cognitive functioning. Psychosocial stress has been associated with differential exe...
Article
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The family environment in childhood has a strong effect on mental health outcomes throughout life. This effect is thought to depend at least in part on modifications of neurodevelopment trajectories. In this exploratory study, we sought to investigate whether a feasible resting-state fMRI metric of local spontaneous oscillatory neural activity, the...
Preprint
BACKGROUND Although the availability and use of mobile mental health apps has grown exponentially in recent years, little data are available regarding their efficacy. OBJECTIVE This study aimed to evaluate the effectiveness of an app developed to promote stress management and well-being among working women compared with a control app. METHODS Fem...
Article
Background: Decreased short-interval intracortical inhibition (SICI) to transcranial magnetic stimulation (TMS) of the primary motor cortex was described in subjects with restless legs syndrome/Willis-Ekbom disease (RLS/WED). It remained to be determined whether the magnitude of SICI decrease would be similar across levels of RLS/WED severity. Mor...
Article
The fractional amplitude of low-frequency fluctuations (fALFFs) of the BOLD signal have been successfully applied as exploratory tools in neuroimaging. This metric has been useful in mapping brain functional changes in many clinical populations. However, little is known about the neurophysiological correlates of fALFF. This study aimed at demonstra...
Article
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Abstract Enhanced resolution of 7 T magnetic resonance imaging (MRI) scanners has considerably advanced our knowledge of structure and function in human and animal brains. Post-industrialized countries are particularly prone to an ever-increasing number of ageing individuals and ageing-associated neurodegenerative diseases. Neurodegenerative diseas...
Article
Purpose “Chemobrain” is a medical secondary effect of cancer chemotherapy treatment characterized by a general decline in cognition affecting visual and verbal memory, attention, complex problem-solving skills, and motor function. Dopamine (DA) central nervous system neurotransmitters serve an important role in cognition, and changes in DA could po...
Article
Prior work has revealed that mnemonic strategy training (MST)can enhance memory for specific content and engages regions in the frontoparietal cognitive control network. Evidence of transfer to novel content is less clear. Here, we provide secondary analysis of functional magnetic resonance imaging (fMRI)data acquired during a randomized controlled...
Article
Atualmente há grande interesse em métodos funcionais não invasivos que poderiam localizar a zona epileptogênica e sua relação com as diversas áreas funcionais corticais. Entre essas novas metodologias, a ressonância magnética funcional é provavelmente um instrumento com potencial para uso na prática clínica. Nós revisamos seus princípios e metodolo...
Article
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Background Women have been assuming more responsibilities and higher positions in major companies, which exposes them to high levels of stress. Higher perceived work stress is related to higher emotional reactivity. Difficulties with emotional regulation can lead to anxiety and mood disorders, which are more prevalent in women than men. Indeed, wom...
Article
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Background: Mnemonic strategy training (MST) has been shown to improve cognitive performance in amnestic mild cognitive impairment (a-MCI), however, several questions remain unresolved. The goal of the present study was to replicate earlier pilot study findings using a randomized controlled design and to evaluate transfer effects and changes in bra...
Article
•Active tDCS of the unaffected M1 (M1UH) was safe within six weeks after stroke. •One subject reported paresthesias in the paretic arm during active tDCS of M1UH. •Sleepiness was more frequent after active tDCS of M1UH than sham.
Article
Face-name association is a relevant ability for social interactions and involves the ventral and dorsolateral prefrontal cortices, particularly in the left hemisphere, bilateral hippocampal, fusiform gyrus and occipital regions. Previous studies demonstrated the primary role of the hippocampus for this ability in healthy subjects. However, no study...
Article
Background and purpose: Among several cognitive advantages, meditation is thought to enhance practitioners' capacity for sustained attention. In the present study, we explored this question by testing meditation practitioners (meditators) and nonpractitioners (nonmeditators) on a task that requires sustained attention, the Stroop Word-Color Task (...
Article
Objective To compare cognition and brain function in elderly Tai Chi and Water Aerobics practitioners. Methods Eight Tai Chi (TC) and 8 Water Aerobics (WA) practitioners matched by gender, education and age underwent neuropsychological and fMRI scan during attention (Stroop Word Color Task) and working memory (N Back) tasks. Results Groups were s...
Data
Within group brain activation in meditators and non-meditators. Non-meditators: clusters encompassing posterior cingulate gyrus, caudate, occipital lobe and frontal pole presented reduced activation after the retreat. Meditators: clusters encompassing middle frontal gyrus, parietal lobe, inferior frontal gyrus (IFG) and superior parietal lobule sho...
Article
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Meditation as a cognitive enhancement technique is of growing interest in the field of health and research on brain function. The Stroop Word-Color Task (SWCT) has been adapted for neuroimaging studies as an interesting paradigm for the understanding of cognitive control mechanisms. Performance in the SWCT requires both attention and impulse contro...
Data
Brain regions activated in tasks with predictable components (PRED, pPRED, tPRED) compared to SAC. MNI peak voxels coordinates for children. (PDF)
Data
Brain regions activated in tasks with predictable components (PRED, pPRED, tPRED) compared to SAC. MNI peak voxels coordinates for adults. (PDF)
Article
Introduction Chorea-acanthocytosis (ChAc) and Huntington's disease (HD) are neurodegenerative conditions that share clinical and neuropathological features, despite their distinct genetic etiologies. Methods In order to compare these neuropathologies, serial gallocyanin-stained brain sections from three subjects with ChAc were analyzed and compare...