191 research outputs found
Topographie automatique du champ visuel central (entre les 20 degrees) chez des patients glaucomateux
No full textRésumé " La diffusion des micro-ordinateurs actuels permet d'effectuer un examen campimétrique de la vision centrale totalement computérisé (entre les 20°), sans devoir utiliser des appareils exclusivement destinés à cette utilisation. Le micro-ordinateur effectue l'examen en présentant sur un écran télévisé une impulsion lumineuse changeant de dimension et de localisation. L'examen foumit une carte topographique représentant la distribution du seuil de perception. La vitesse et la précision de la méthode ont permis une étude sur des patients glaucomateux
[Congenital analgesia].
No full textThe case of a 12 years old boy with a congenital anaesthesia covering all cutaneous and visceral districts is reported. There were no other neurological abnormalities apart a light mental retardation and loss of axon reflex after intradermal injection of hystamine. Notwithstanding this last finding a diagnosis of congenital indifference to pain was made. The differential diagnosis between indifference and insensitivity to pain is discussed
Membro Comitato scientifico del Convegno L'iperidrosi: dalla ghiandola sudoripara alla società, 17 Aprile, Roma (relazione S. Ricci: Iperidrosi e medicina sociale).
No full text
Evoked potentials with personal computer
No full textOne of the most frequently used examination in neurological diagnosis is constituted by the evoked potential (EP). In this comunication we present our project of a computerized apparatus for the acquisition and processing of EP. Firstly devoped for the analysis and processing of EP in response to visual stimuli (VEP, Visual Evoked Potentials), now is also ready for Somatosensory (SEP) and acoustical (AEP) stimuli
MIGRAINE AND EPILEPSY: LOOKING FOR A COMMON PATHOPHYSIOLOGICAL MODEL
No full textThis contribution reports about the results gathered from in-silico experiments testing the feasibility of a research
program based upon a common pathophysiological mechanism for migraine and epilepsy. In a rst set of experiments,
the Electroencephalographic (EEG) signals from couples of corresponding electrodes in the two cerebral emispheres,
as well as from couples of continguous electrodes in the left and right emisphere, were systematically correlated. In
both cases, the existence of ordered distributions of activity patterns in the EEG signals from migranious and epileptic
subjects was qualitatively assessed. In a subsequent and crucial set of experiments, we were able to obtain some
spatially ordered and oscillating synchronization patterns of virtual neurons distributed over a bidimensional region,
by means of a multi-agent simulation environment (Netlogo). On the basis of such results, a further development
of our research program including the enrichment of the data set and the consideration of other powerful simulation
approaches, e.g. Articial Neural Network (ANN) or Genetic Algorithms (GA), seems in the good track of realizing
a realistic simulation of the Cortical Spreading Depression Waves, potentially useful even for clinical purposes
EEG SIGNALS IN EPILEPSY AND MIGRAINE: Analysis and Simulations by Multi-Agent Systems
No full textThe preliminary results of some observations carried out on the spectral content of EEG signals from migran-ious and epileptic individuals and, in particular, on the spatio-temporal correlation of the neuronal activation in the two pathologies, are presented. In the aim to simulate the qualitative features of EEG signals associated to migraine and epilepsy, we used a computational approach based upon Pearson correlations and a Multi Agent System. Our findings, although still not conclusive, revealed considerable heuristic power on the sole assumption of a similar synchronization process of the underlying neuronal population, and may provide in the long term useful hints to a very difficult problem
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