Ricardo Martins
University of Coimbra
Motion (physics)Bayesian probabilityHaptic technologyArtificial intelligencePsychologyNeuroscienceGeneralizationPattern recognitionPerceptionRepresentation (systemics)Grey matterVisual cortexPerceptComputer visionComputer scienceProbabilistic logicWorkspaceObject (computer science)MedicineBistability
28Publications
6H-index
116Citations
Publications 28
Newest
#1Ricardo Martins (UC: University of Coimbra)H-Index: 6
#2Francisco P. M. Oliveira (Champalimaud Foundation)H-Index: 12
Last. Miguel Castelo-BrancoH-Index: 36
view all 7 authors...
OBJECTIVE To explore the viability of developing a computer-aided diagnostic system for Parkinsonian syndromes using dynamic [11C]raclopride PET and T1-weighted MRI data. APPROACH The biological heterogeneity of Parkinsonian syndromes renders their statistical classification a challenge. The unique combination of structural and molecular imaging data allowed different classifier designs to be tested. Datasets from dynamic [11C]raclopride PET and T1-weighted MRI scans were acquired from six group...
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#1Teresa Sousa (UC: University of Coimbra)H-Index: 8
#2João V. Duarte (UC: University of Coimbra)H-Index: 6
Last. Miguel Castelo-Branco (UC: University of Coimbra)H-Index: 36
view all 7 authors...
Neuroimaging studies have suggested that hMT+ encodes global motion interpretation, but this contradicts the notion that BOLD activity mainly reflects neuronal input. While measuring fMRI responses at 7 Tesla, we used an ambiguous moving stimulus, yielding the perception of two incoherently moving surfaces-component motion-or only one coherently moving surface-pattern motion, to induce perceptual fluctuations and identify perceptual organization size-matched domains in hMT+. Then, moving grating...
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#1H Catarina Pereira (UC: University of Coimbra)H-Index: 3
#2Daniela Sousa (UC: University of Coimbra)
Last. Miguel Castelo-Branco (UC: University of Coimbra)H-Index: 36
view all 8 authors...
Recent studies suggest that temporoparietal junction (TPJ) modulation can influence attention and social cognition performance. Nevertheless, no studies have used multichannel transcranial direct current stimulation (tDCS) over bilateral TPJ to estimate the effects on these neuropsychological functions. The project STIPED is using optimized multichannel stimulation as an innovative treatment approach for chronic pediatric neurodevelopmental disorders, namely in children/adolescents with Autism S...
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#1Lília Jorge (UC: University of Coimbra)H-Index: 4
#2Ricardo Martins (UC: University of Coimbra)H-Index: 6
Last. Miguel Castelo-Branco (UC: University of Coimbra)H-Index: 36
view all 7 authors...
BACKGROUND It has been proposed that amyloid-β (Aβ) plays a causal role in Alzheimer's disease (AD) by triggering a series of pathologic events-possibly including neuroinflammation-which culminate in progressive brain atrophy. However, the interplay between the two pathological molecular events and how both are associated with neurodegeneration is still unclear. OBJECTIVE We aimed to estimate the spatial inter-relationship between neurodegeneration, neuroinflammation and Aβ deposition in a cohor...
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#1Lília JorgeH-Index: 4
#2Nádia CanárioH-Index: 5
Last. Miguel Castelo-BrancoH-Index: 36
view all 9 authors...
The retina may serve as putative window into neuropathology of synaptic loss in Alzheimer’s disease (AD). Here, we investigated synapse-rich layers versus layers composed by nuclei/cell bodies in an early stage of AD. In addition, we examined the associations between retinal changes and molecular and structural markers of cortical damage. We recruited 20 AD patients and 17 healthy controls (HC). Combining optical coherence tomography (OCT), magnetic resonance (MR), and positron emission tomograp...
2 CitationsSource
#1Alexandre Sayal (UC: University of Coimbra)H-Index: 2
#2Teresa Sousa (UC: University of Coimbra)H-Index: 8
Last. Miguel Castelo-BrancoH-Index: 36
view all 6 authors...
Abstract Hysteresis is a well-known phenomenon in physics that relates changes in a system with its prior history. It is also part of human visual experience (perceptual hysteresis), and two different neural mechanisms might explain it: persistence (a cause of positive hysteresis), which forces to keep a current percept for longer, and adaptation (a cause of negative hysteresis), which in turn favors the switch to a competing percept early on. In this study, we explore the neural correlates unde...
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#1Nuno Madeira (UC: University of Coimbra)H-Index: 7
#2João V. Duarte (UC: University of Coimbra)H-Index: 6
Last. Miguel Castelo-Branco (UC: University of Coimbra)H-Index: 36
view all 6 authors...
Abstract Schizophrenia is believed to be a neurodevelopmental disease with high heritability. Differential diagnosis is often challenging, especially in early phases, namely with other psychotic disorders or even mood disorders. such as bipolar disorder with psychotic symptoms. Key pathophysiological changes separating these two classical psychoses remain poorly understood, and current evidence favors a more dimensional than categorical differentiation between schizophrenia and bipolar disorder....
5 CitationsSource
#1Teresa SousaH-Index: 8
#2João V. Duarte (UC: University of Coimbra)H-Index: 6
Last. Miguel Castelo-Branco (UC: University of Coimbra)H-Index: 36
view all 7 authors...
The role of long-range integration mechanisms underlying visual perceptual binding and their link to interhemispheric functional connectivity, as measured by fMRI, remains elusive. Only inferences on anatomical organization from resting state data paradigms not requiring coherent binding have been achieved. Here, we used a paradigm that allowed us to study such relation between perceptual interpretation and functional connectivity under bistable interhemispheric binding vs. non-binding of visual...
1 CitationsSource
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