Paolo Bruno

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Equations are derived for the electric potentials [electroencephalogram (EEG)] produced by dipolar sources in a multiregion bicentric-spheres volume-conductor head model. Being the equations valid for an arbitrary number of regions, our proposal is a generalization of many spherical models presented so far in literature, each of those regarded as a(More)
EEG-based source localization techniques use scalp-potential data to estimate the location of underlying neural activity. EEG source location reconstruction requires the assumption of a source model and the assumption of a conductive head model. Brain lesions can present conductivity values that are dramatically different from those of surrounding normal(More)
Accurate EEG source reconstruction needs an appropriate volume conductor head model including, in the presence of a morphological brain lesion, a lesion compartment. Lesion electrical properties (conductivity) can not be measured in vivo and need to be retrieved from literature on the base of lesion type identification, performed by means of diagnostic(More)
Brain electrical activity effects spread (spatially) over the whole head volume conductor. Electric scalp potentials (EEG) are the measurable evidences of such activity. EEG forward problem solution involves computing the scalp potentials at a finite set of sensor locations for a source configuration in a specified volume conductor model of the head or of(More)
Bioelectrical phenomena spread within the whole body (the conductor medium) independently of electrical source position within the body. However, under certain circumstances, it is possible to limit the volume within which the study can be done. Given its high resistivity, the skull limits the spread of bioelectrical currents due to brain sources and it(More)
Accurate head modeling is required to properly simulate bioelectric phenomena in 3-D as well as to estimate the 3-D bioelectric activity starting from superficial bioelectric measurements and 3-D imaging. Aiming to build an accurate and realistic representation of the volume conductor of the head, also the anisotropy of head tissues should be taken into(More)
Source localization techniques based on electroencephalography (EEG) use scalp potential data to infer the location of brain neural activity. A volume conductor model describing the electrical properties of the human head is needed. Lesions have conductivity considerably different from that of normal brain and should be included in the head model because(More)
Realistic electrical brain activity mapping implies reconstructing and visualizing sources of electrical brain activity within the specific patient's head. This requires the assumption of a precise and realistic volume conductor model of the specific subject's head, i.e., a 3-D representation of the head's electrical properties in terms of shape and(More)
Based on first-principles electron structure calculations and employing the frozen-magnon approximation, we study the exchange interactions in a series of transition-metal binary alloys crystallizing in the zinc-blende structure and calculate the Curie temperature within both the mean-field approximation and random-phase approximation. We study two Cr(More)
EEG source reconstruction accuracy depends on numerous factors, including head modeling accuracy, the specific inverse approach and the adopted EEG measurement montage. In This work we present results of a simulation study, performed with an eccentric-spheres head model, investigating the EEC dipole source reconstruction errors bounds caused by neglecting(More)