IMT Institutional Repository: No conditions. Results ordered -Date Deposited. 2024-03-29T11:50:11ZEPrintshttp://eprints.imtlucca.it/images/logowhite.pnghttp://eprints.imtlucca.it/2016-09-13T08:14:47Z2016-09-13T08:14:47Zhttp://eprints.imtlucca.it/id/eprint/3537This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/35372016-09-13T08:14:47ZCombination of event-related potentials and functional magnetic resonance imaging during single-letter readingThis work proposes a mathematical approach for combining event-related potentials (ERPs) and functional magnetic resonance images (fMRI). Data were separately recorded during the same event-related experimental design, consisting of visually presented single letters and non-alphabetic symbols, that had to be either simply observed (passive condition) or read aloud (active condition). This protocol was useful for exploring the neural correlates of reading processes. Healthy adults participated in the experiment. Averaged ERPs were decomposed by independent component analysis; low resolution electromagnetic tomography (LORETA) was applied to estimate the current density distribution maps of each independent component. fMRI images time series were analyzed by multiple linear regression. ERP-fMRI correspondence was quantified by computing the Euclidean distance between LORETA local maxima and clusters of significantly activated fMRI voxels. During reading aloud of letters, that is clearly the task most similar to natural reading conditions, significant electrical and hemodynamic response was observed in the left medial frontal gyrus (BA 6) and left middle temporal gyrus (BA 22/39) just before articulation and in the bilateral middle superior temporal gyrus (BA 22/37) during and after verbal-motor production. These results indicate that the middle-superior temporal gyrus plays a crucial and multifunctional role in grapheme-phoneme matchingSilvia CasarottoAnna M. BianchiSergio CeruttiNicola VanelloEmiliano Ricciardiemiliano.ricciardi@imtlucca.itClaudio GentiliLorenzo SaniDaniela BoninoMario GuazzelliPietro Pietrinipietro.pietrini@imtlucca.itLuigi LandiniGiuseppe A. Chiarenza2016-09-12T11:12:22Z2016-09-12T11:12:22Zhttp://eprints.imtlucca.it/id/eprint/3531This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/35312016-09-12T11:12:22ZAnalysis of residual dependencies of independent components extracted from fMRI dataIndependent component analysis (ICA) of functional magnetic resonance imaging (fMRI) data can be employed as an exploratory method. The lack in the ICA model of strong a priori assumptions about the signal or about the noise leads to difficult interpretations of the results. Moreover, the statistical independence of the components is only approximated. Residual dependencies among the components can reveal informative structure in the data. A major problem is related to model order selection, that is, the number of components to be extracted. Specifically, overestimation may lead to component splitting. In this work, a method based on hierarchical clustering of ICA applied to fMRI datasets is investigated. The clustering algorithm uses a metric based on the mutual information between the ICs. To estimate the similarity measure, a histogram-based technique and one based on kernel density estimation are tested on simulated datasets. Simulations results indicate that the method could be used to cluster components related to the same task and resulting from a splitting process occurring at different model orders. Different performances of the similarity measures were found and discussed. Preliminary results on real data are reported and show that the method can group task related and transiently task related components.Nicola VanelloEmiliano Ricciardiemiliano.ricciardi@imtlucca.itLuigi Landini2016-06-09T10:53:27Z2016-09-13T10:09:53Zhttp://eprints.imtlucca.it/id/eprint/3498This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/34982016-06-09T10:53:27ZA Combined ERPs and fMRI Approach to Investigate the Neural Correlates of Reading in the Human BrainSilvia CasarottoA.M. BianchiSergio CeruttiNicola VanelloEmiliano Ricciardiemiliano.ricciardi@imtlucca.itClaudio GentiliLorenzo SaniDaniela BoninoMario GuazzelliPietro Pietrinipietro.pietrini@imtlucca.itLuigi LandiniGiuseppe A. Chiarenza2016-05-04T16:16:35Z2016-09-13T10:10:31Zhttp://eprints.imtlucca.it/id/eprint/3479This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/34792016-05-04T16:16:35ZA compatible electrocutaneous display for functional magnetic resonance imaging applicationIn this paper we propose an MR (magnetic resonance) compatible electrocutaneous stimulator able to inject an electric current, variable in amplitude and frequency, into the fingertips in order to elicit tactile skin receptors (mechanoreceptors). The desired goal is to evoke specific tactile sensations selectively stimulating skin receptors by means of an electric current in place of mechanical stimuli. The field of application ranges from functional magnetic resonance imaging (fMRI) tactile studies to augmented reality technology. The device here proposed is designed using safety criteria in order to comply with the threshold of voltage and current permitted by regulations. Moreover, MR safety and compatibility criteria were considered in order to perform experiments inside the MR scanner during an fMRI acquisition for functional brain activation analysis. Psychophysical laboratory tests are performed in order to define the different evoked tactile sensation. After verifying the device MR safety and compatibility on a phantom, a test on a human subject during fMRI acquisition is performed to visualize the brain areas activated by the simulated tactile sensation.Valentina HartwigClaudia CappelliNicola VanelloEmiliano Ricciardiemiliano.ricciardi@imtlucca.itEnzo Pasquale ScilingoGiulio GiovannettiMaria Filomena SantarelliVincenzo PositanoPietro Pietrinipietro.pietrini@imtlucca.itLuigi LandiniAntonio Bicchi2016-04-07T09:19:29Z2016-04-07T09:19:29Zhttp://eprints.imtlucca.it/id/eprint/3389This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/33892016-04-07T09:19:29ZAdvance image processing in clinical and research applicationsDavide CaramellaEmanuele NeriM. LombardiLuigi LandiniVincenzo PositanoS. La MannaA. StaritaPietro Pietrinipietro.pietrini@imtlucca.itMario GuazzelliJames V. HaxbyCarlo Bartolozzi2016-04-05T09:57:58Z2016-09-13T10:17:50Zhttp://eprints.imtlucca.it/id/eprint/3372This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/33722016-04-05T09:57:58ZPerception of optic and tactile flow both activate V5/MT cortical complex in the human brainV5/MT complex responds selectively to perception of optic flow (Morrone et al., Nature Neurosci , 2001). Since similarities exist between visual and tactile perception, we hypothesized that tactile flow might also rely on V5/MT response. We and others have shown recently that visual extrastriate cortical areas respond both during visual and tactile recognition of objects, indicating that these regions are organized in a supramodal fashion. In this study, we measured neural response evoked during visual and tactile perception of coherently moving dot patterns to test the hypothesis that V5/MT may be supramodally organized and may respond also to tactile stimulation.Nicola VanelloEmiliano Ricciardiemiliano.ricciardi@imtlucca.itDavide DenteNicola SgambelluriEnzo Pasquale ScilingoClaudio GentiliLorenzo SaniVincenzo PositanoMaria Filomena SantarelliMario GuazzelliJames V. HaxbyLuigi LandiniAntonio BicchiPietro Pietrinipietro.pietrini@imtlucca.it2016-04-05T09:48:25Z2016-09-13T10:17:30Zhttp://eprints.imtlucca.it/id/eprint/3371This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/33712016-04-05T09:48:25ZA simulator for multilevel analysis of functional magnetic resonance dataNicola VanelloVincenzo PositanoMaria Filomena SantarelliEmiliano Ricciardiemiliano.ricciardi@imtlucca.itPietro Pietrinipietro.pietrini@imtlucca.itLuigi Landini2016-04-05T09:14:44Z2016-09-13T10:16:48Zhttp://eprints.imtlucca.it/id/eprint/3369This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/33692016-04-05T09:14:44ZBrain activity associated with forgiving and unforgiving behavior in Humans as assessed with fMRIEmiliano Ricciardiemiliano.ricciardi@imtlucca.itClaudio GentiliM. RizzoNicola VanelloLorenzo SaniLuigi LandiniMario GuazzelliPietro Pietrinipietro.pietrini@imtlucca.it2016-04-05T08:50:04Z2016-09-13T10:15:19Zhttp://eprints.imtlucca.it/id/eprint/3368This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/33682016-04-05T08:50:04ZA compatibility test for tactile displays designed for
fMRI studiesThe purpose of this document is to provide a compatibility test for
mechatronic devices to be used within a diagnostic MR environment. In order
to design new devices that can produce tactile stimuli of different nature inside
the MRI environment, compatibility tests with several materials and mechatronic
devices are reported. Results of these experiments are analyzed in order
to evaluate artefacts caused by the presence and actuation of the devices.Valentina HartwigNicola VanelloRoger GassertDominique ChapuisMaria Filomena SantarelliVincenzo PositanoEmiliano Ricciardiemiliano.ricciardi@imtlucca.itPietro Pietrinipietro.pietrini@imtlucca.itLuigi LandiniAntonio Bicchi2016-04-04T10:18:59Z2016-09-13T10:17:16Zhttp://eprints.imtlucca.it/id/eprint/3357This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/33572016-04-04T10:18:59ZPerception of visual and tactile flow activates common cortical areas in the human brainWe report results of a pilot study using functional magnetic resonance
imaging aimed at determining the neural correlates of tactile flow. We
hypothesized that brain response to tactile flow would involve the same cortical
areas (V5/MT) that respond to optic flow. Our results showed that V5/MT cortex
indeed is activated by tactile flow perception. These findings are consistent
with a supramodal organization of brain regions involved in optic and tactile
flow processingEmiliano Ricciardiemiliano.ricciardi@imtlucca.itNicola VanelloDavide DenteNicola SgambelluriEnzo Pasquale ScilingoClaudio GentiliLorenzo SaniVincenzo PositanoMaria Filomena SantarelliMario GuazzelliJames V. HaxbyLuigi LandiniAntonio BicchiPietro Pietrinipietro.pietrini@imtlucca.it2016-03-23T13:07:11Z2016-09-13T10:18:01Zhttp://eprints.imtlucca.it/id/eprint/3320This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/33202016-03-23T13:07:11ZIndependent component analysis of fMRI data: a model based approach for artifacts separationIndependent component analysis applied to functional magnetic resonance imaging is a promising technique for non invasive study of brain function. We examine the behavior of spatial ICA decomposition applying ICA to simulated data sets. We study the ICA performances in presence of movement correlated and uncorrelated with activation task, also taking into account the presence of rician distributed noise. We show that the presence of image artifacts due to simulated subject movement and MRI noise greatly affects the method ability to reveal the activation, especially in the presence of movement correlated with activation task. Spatial smoothing of data, before ICA, seems to overcome this problem, allowing us to retrieve the original sources also in the presence of both correlated movement and high noise level.Nicola VanelloVincenzo PositanoEmiliano Ricciardiemiliano.ricciardi@imtlucca.itMaria Filomena SantarelliMario GuazzelliPietro Pietrinipietro.pietrini@imtlucca.itLuigi Landini2016-03-23T13:01:40Z2016-09-13T10:19:00Zhttp://eprints.imtlucca.it/id/eprint/3319This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/33192016-03-23T13:01:40ZSeparation of movement and task related fMRI signal changes in a simulated data set by Independent Component AnalysisNicola VanelloVincenzo PositanoEmiliano Ricciardiemiliano.ricciardi@imtlucca.itMaria Filomena SantarelliMario GuazzelliPietro Pietrinipietro.pietrini@imtlucca.itLuigi Landini2016-03-23T12:04:49Z2016-09-13T10:11:38Zhttp://eprints.imtlucca.it/id/eprint/3311This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/33112016-03-23T12:04:49ZStudy of Reading Processes with ERPs and ER-FMRISilvia CasarottoA.M. BianchiSergio CeruttiDaniela BoninoClaudio GentiliEmiliano Ricciardiemiliano.ricciardi@imtlucca.itLorenzo SaniNicola VanelloMario GuazzelliPietro Pietrinipietro.pietrini@imtlucca.itLuigi LandiniGiuseppe A. Chiarenza2016-03-23T11:57:59Z2016-09-13T10:14:13Zhttp://eprints.imtlucca.it/id/eprint/3310This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/33102016-03-23T11:57:59ZVisual and tactile spatial discrimination activates the dorsal cortical pathway: a fMRI study in sighted and congenitally blind humansEmiliano Ricciardiemiliano.ricciardi@imtlucca.itDaniela BoninoLorenzo SaniClaudio GentiliNicola VanelloLuigi LandiniMario GuazzelliTomaso VecchiPietro Pietrinipietro.pietrini@imtlucca.it2016-03-23T10:54:48Z2016-09-13T10:14:50Zhttp://eprints.imtlucca.it/id/eprint/3309This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/33092016-03-23T10:54:48ZSupramodal organization in the "visual" cortical pathways as assessed by functional magnetic resonance in humansEmiliano Ricciardiemiliano.ricciardi@imtlucca.itNicola VanelloDaniela BoninoClaudio GentiliLorenzo SaniSabrina DantiNicola SgambelluriJames V. HaxbyLuigi LandiniTomaso VecchiMario GuazzelliAntonio BicchiPietro Pietrinipietro.pietrini@imtlucca.it2016-03-23T10:34:11Z2016-09-13T10:14:39Zhttp://eprints.imtlucca.it/id/eprint/3306This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/33062016-03-23T10:34:11ZSupramodal response of human MT+ complex to visual and tactile perception of flow as demonstrated by fMRI studies in sighted and congenitally blind individualsEmiliano Ricciardiemiliano.ricciardi@imtlucca.itLorenzo SaniClaudio GentiliNicola VanelloJames V. HaxbyLuigi LandiniAntonio BicchiPietro Pietrinipietro.pietrini@imtlucca.it2016-03-23T10:17:52Z2016-09-13T10:11:22Zhttp://eprints.imtlucca.it/id/eprint/3304This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/33042016-03-23T10:17:52ZSupramodal cortical organization of the dorsal stream during visual and tactile spatial discrimination in sighted and congenitally-blind subjectsDaniela BoninoEmiliano Ricciardiemiliano.ricciardi@imtlucca.itLorenzo SaniClaudio GentiliLuigi LandiniMario GuazzelliTomaso VecchiPietro Pietrinipietro.pietrini@imtlucca.it2016-03-23T10:11:37Z2016-09-13T10:14:28Zhttp://eprints.imtlucca.it/id/eprint/3303This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/33032016-03-23T10:11:37ZSupramodal organization in the visual cortical pathways in sighted and blind individualsEmiliano Ricciardiemiliano.ricciardi@imtlucca.itClaudio GentiliNicola VanelloLorenzo SaniMario GuazzelliLuigi LandiniPietro Pietrinipietro.pietrini@imtlucca.it2016-02-29T16:53:08Z2016-09-13T10:11:00Zhttp://eprints.imtlucca.it/id/eprint/3169This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/31692016-02-29T16:53:08ZAdvanced data analysis in brain functional studies with magnetic resonance imagingNicola VanelloMaria Filomena SantarelliVincenzo PositanoEmiliano Ricciardiemiliano.ricciardi@imtlucca.itPietro Pietrinipietro.pietrini@imtlucca.itLuigi Landini2016-02-29T10:11:17Z2016-09-13T10:09:03Zhttp://eprints.imtlucca.it/id/eprint/3162This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/31622016-02-29T10:11:17ZThe Effect of Visual Experience on the Development of Functional Architecture in hMT+We investigated whether the visual hMT+ cortex plays a role in supramodal representation of sensory flow, not mediated by visual mental imagery. We used functional magnetic resonance imaging to measure neural activity in sighted and congenitally blind individuals during passive perception of optic and tactile flows. Visual motion–responsive cortex, including hMT+, was identified in the lateral occipital and inferior temporal cortices of the sighted subjects by response to optic flow. Tactile flow perception in sighted subjects activated the more anterior part of these cortical regions but deactivated the more posterior part. By contrast, perception of tactile flow in blind subjects activated the full extent, including the more posterior part. These results demonstrate that activation of hMT+ and surrounding cortex by tactile flow is not mediated by visual mental imagery and that the functional organization of hMT+ can develop to subserve tactile flow perception in the absence of any visual experience. Moreover, visual experience leads to a segregation of the motion-responsive occipitotemporal cortex into an anterior subregion involved in the representation of both optic and tactile flows and a posterior subregion that processes optic flow only.Emiliano Ricciardiemiliano.ricciardi@imtlucca.itNicola VanelloLorenzo SaniClaudio GentiliEnzo Pasquale ScilingoLuigi LandiniMario GuazzelliAntonio BicchiJames V. HaxbyPietro Pietrinipietro.pietrini@imtlucca.it2016-02-29T09:59:32Z2016-09-13T10:09:17Zhttp://eprints.imtlucca.it/id/eprint/3160This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/31602016-02-29T09:59:32ZAn MRI Compatibility Study of a Fabric Sensing Glove for Sensory-Motor Brain Activity ExplorationIn this work we investigated the compatibility with
functional Magnetic Resonance Imaging (fMRI) studies of a
fabric sensing glove. The glove is able to monitor hand
posture and gesture, and could be fruitfully used in fMRI
studies to explore brain activity during specific tactile or
motor tasks. A specific compatibility test was performed and
results are discussed. Preliminary results of an fMRI
experiment on a subject wearing the glove are also reported
and reproducibility issues are suitably addressed.Nicola VanelloValentina HartwigMario TesconiGiuseppe ZuponeNicola SgambelluriAlessandro TognettiEmiliano Ricciardiemiliano.ricciardi@imtlucca.itEnzo Pasquale ScilingoAntonio BicchiPietro Pietrinipietro.pietrini@imtlucca.itDanilo De RossiLuigi Landini2016-02-29T09:53:52Z2016-09-13T10:08:24Zhttp://eprints.imtlucca.it/id/eprint/3158This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/31582016-02-29T09:53:52ZElectrocutaneous stimulation of skin mechanoreceptors for tactile studies with functional Magnetic Resonance ImagingValentina HartwigClaudia CappelliNicola VanelloEmiliano Ricciardiemiliano.ricciardi@imtlucca.itEnzo Pasquale ScilingoGiulio GiovannettiMaria Filomena SantarelliVincenzo PositanoAntonio BicchiPietro Pietrinipietro.pietrini@imtlucca.itLuigi Landini2016-02-22T10:41:48Z2016-09-13T09:56:48Zhttp://eprints.imtlucca.it/id/eprint/3100This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/31002016-02-22T10:41:48ZSensing Glove for Brain Studies: Design and Assessment of Its Compatibility for fMRI With a Robust TestIn this paper, we describe a biomimetic-fabric-based sensing glove that can be used to monitor hand posture and gesture. Our device is made of a distributed sensor network of piezoresistive conductive elastomers integrated into an elastic fabric. This solution does not affect natural movement and hand gestures, and can be worn for a long time with no discomfort. The glove could be fruitfully employed in behavioral and functional studies with functional MRI (fMRI) during specific tactile or motor tasks. To assess MR compatibility of the system, a statistical test on phantoms is introduced. This test can also be used for testing the compatibility of mechatronic devices designed to produce different stimuli inside the MR environment. We propose a statistical test to evaluate changes in SNR and time-domain standard deviations between image sequences acquired under different experimental conditions. fMRI experiments on subjects wearing the glove are reported. The reproducibility of fMRI results obtained with and without the glove was estimated. A good similarity between the activated regions was found in the two conditions.Nicola VanelloValentina HartwigMario TesconiEmiliano Ricciardiemiliano.ricciardi@imtlucca.itAlessandro TognettiGiuseppe ZuponeRoger GassertDominique ChapuisNicola SgambelluriEnzo Pasquale ScilingoGiulio GiovannettiVincenzo PositanoMaria Filomena SantarelliAntonio BicchiPietro Pietrinipietro.pietrini@imtlucca.itDanilo De RossiLuigi Landini2016-02-22T10:36:49Z2016-09-13T10:07:12Zhttp://eprints.imtlucca.it/id/eprint/3099This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/30992016-02-22T10:36:49ZA sensing glove for enhancing exploration of brain functions in haptic tasksNicola VanelloValentina HartwigMario TesconiEmiliano Ricciardiemiliano.ricciardi@imtlucca.itAlessandro TognettiGiuseppe ZuponeEnzo Pasquale ScilingoGiulio GiovannettiVincenzo PositanoMaria Filomena SantarelliPietro Pietrinipietro.pietrini@imtlucca.itDanilo De RossiLuigi LandiniAntonio Bicchi2016-02-19T11:37:58Z2016-09-13T10:06:49Zhttp://eprints.imtlucca.it/id/eprint/3078This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/30782016-02-19T11:37:58ZPsychophysiological and fMRI neural correlates to stress response: A pilot studyCarlo PrunetiNicola VanelloRosalba MoreseClaudio GentiliFederico FontanaEmiliano Ricciardiemiliano.ricciardi@imtlucca.itChiara FanteMarco PaterniPietro Pietrinipietro.pietrini@imtlucca.itMario GuazzelliLuigi LandiniEzio Maria Ferdeghini2015-11-18T11:23:28Z2016-09-12T11:46:49Zhttp://eprints.imtlucca.it/id/eprint/2923This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/29232015-11-18T11:23:28ZA MR Compatible Sensing Glove for Brain StudiesNicola VanelloValentina HartwigMario TesconiEmiliano Ricciardiemiliano.ricciardi@imtlucca.itGiuseppe ZuponeAlessandro TognettiDaniela BoninoEnzo Pasquale ScilingoFabrizio CutoloGiulio GiovannettiPietro Pietrinipietro.pietrini@imtlucca.itDanilo De RossiLuigi Landini2015-11-18T11:03:28Z2016-09-13T09:51:45Zhttp://eprints.imtlucca.it/id/eprint/2919This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/29192015-11-18T11:03:28ZFMRI Compatible Sensing Glove for Hand Gesture MonitoringHere we describe and validate a fabric sensing glove for hand finger movement monitoring. After a quick calibration procedure, and by suitably processing of the outputs of the glove, it is possible to estimate hand joint angles in real time. Moreover, we tested the fMRI compatibility of the glove and ran a pilot fMRI experiment on the neural correlates of handshaking during human-to-human and human-to-robot interactions. Here we describe how the glove can be used to monitor correct task execution and to improve modeling of the expected hemodynamic responses during fMRI experimental paradigms.Nicola VanelloValentina HartwigEnzo Pasquale ScilingoDaniela BoninoEmiliano Ricciardiemiliano.ricciardi@imtlucca.itAlessandro TognettiPietro Pietrinipietro.pietrini@imtlucca.itDanilo De RossiLuigi LandiniAntonio Bicchi