0000000000217841

AUTHOR

Vincent Walsh

showing 3 related works from this author

Mapping of the human visual cortex using image-guided transcranial magnetic stimulation

2002

We describe a protocol using transcranial magnetic stimulation (TMS) to systematically map the visual sensations induced by focal and non-invasive stimulation of the human occipital cortex. TMS is applied with a figure of eight coil to 28 positions arranged in a 2x2-cm grid over the occipital area. A digitizing tablet connected to a PC computer running customized software, and audio and video recording are used for detailed and accurate data collection and analysis of evoked phosphenes. A frameless image-guided neuronavigational device is used to describe the position of the actual sites of the stimulation coils relative to the cortical surface. Our results show that TMS is able to elicit p…

medicine.medical_specialtygenetic structuresmedicine.medical_treatmentPhosphenesSensory systemAudiologyBlindnessCortex (anatomy)medicineHumansVisual CortexBrain MappingPatient SelectionGeneral NeuroscienceTranscranial Magnetic StimulationTranscranial magnetic stimulationVisual cortexmedicine.anatomical_structurePhospheneVisual prosthesisHuman visual system modelTranscutaneous Electric Nerve StimulationVisual PerceptionEvoked Potentials VisualVisual FieldsPsychologyNeuroscienceGraphics tabletBrain Research Protocols
researchProduct

EFFICACY OF REPETITIVE TRANSCRANIAL MAGNETIC STIMULATION/TRANSCRANIAL DIRECT CURRENT STIMULATION IN COGNITIVE NEUROREHABILITATION

2008

Summary: Cognitive deficits are a common consequence of neurologic disease, in particular, of traumatic brain injury, stroke, and neurodegenerative disorders, and there is evidence that specific cognitive training may be effective in cognitive rehabilitation. Several investigations emphasize the fact that interacting with cortical activity, by means of cortical stimulation, can positively affect the short-term cognitive performance and improve the rehabilitation potential of neurologic patients. In this respect, preliminary evidence suggests that cortical stimulation may play a role in treating aphasia, unilateral neglect, and other cognitive disorders. Several possible mechanisms can accou…

medicine.medical_treatmentBiophysicsLANGUAGE050105 experimental psychologylcsh:RC321-57103 medical and health sciences0302 clinical medicinemedicineHumans0501 psychology and cognitive sciencesCognitive rehabilitation therapylcsh:Neurosciences. Biological psychiatry. NeuropsychiatryNeurorehabilitationCerebral CortexRehabilitationTranscranial direct-current stimulationSettore M-PSI/02 - Psicobiologia E Psicologia FisiologicaGeneral NeuroscienceTRANSCRANIAL DIRECT CURRENT STIMULATION05 social sciencesMEMORYATTENTIONCognitionCOGNITIVE REHABILITATIONTranscranial Magnetic StimulationCognitive trainingTranscranial magnetic stimulationTreatment OutcomeCOGNITIVE DEFICITSBrain stimulationREPETITIVE TRANSCRANIAL MAGNETIC STIMULATIONTranscutaneous Electric Nerve StimulationNeurology (clinical)PsychologyCognition DisordersNeuroscience030217 neurology & neurosurgery
researchProduct

Left insular cortex and left SFG underlie prismatic adaptation effects on time perception: Evidence from fMRI

2014

Prismatic adaptation (PA) has been shown to affect left-to-right spatial representations of temporal durations. A leftward aftereffect usually distorts time representation toward an underestimation, while rightward aftereffect usually results in an overestimation of temporal durations. Here, we used functional magnetic resonance imaging (fMRI) to study the neural mechanisms that underlie PA effects on time perception. Additionally, we investigated whether the effect of PA on time is transient or stable and, in the case of stability, which cortical areas are responsible of its maintenance. Functional brain images were acquired while participants (n = 17) performed a time reproduction task an…

AdultMaleAdolescentgenetic structuresCognitive NeurosciencePrefrontal CortexPosterior parietal cortexBrain mappingYoung AdultFigural AftereffectNeuroplasticitymedicineHumansSPACEPrismatic adaptationPrefrontal cortexFUNCTIONAL MAGNETIC RESONANCE IMAGING (FMRI)Cerebral CortexBrain MappingEvidence-Based MedicineNeuronal PlasticitySettore M-PSI/02 - Psicobiologia E Psicologia Fisiologicamedicine.diagnostic_testWorking memoryHemispatial neglectSpatial representation of timeTime perceptionAdaptation PhysiologicalMagnetic Resonance ImagingTIMENeurologySpace PerceptionFMRITime PerceptionFemaleNerve Netmedicine.symptomPsychologyFunctional magnetic resonance imagingNeuroscienceNeuroImage
researchProduct