Now showing items 1-11 of 11

    • Analysis of Epileptic EEG Signals in Children by Symbolic Dynamics 

      Paternoster, Luca; Vallverdú, Montserrat; Melia, Umberto; Clarià Sancho, Francisco; Voss, Andreas; Caminal Magrans, Pere (IEEE, 2013-07)
      Epilepsy is one of the most prevalent neurological disorders among children. The study of surface EEG signals in patients with epilepsy by techniques based on symbolic dynamics can provide new insights into the epileptogenic ...
    • Auto-Mutual Information Function for Predicting Pain Responses in EEG Signals during Sedation 

      Melia, Umberto; Vallverdú, Montserrat; Jospin, M.; Jensen, E. W.; Valencia, J. F.; Clarià Sancho, Francisco; Gambus, P. L.; Caminal Magrans, Pere (Springer, 2014-01)
      The level of sedation in patients undergoing medical procedures evolves continuously, such as the effect of the anesthetic and analgesic agents is counteracted by pain stimuli. The monitors of depth of anesthesia, based ...
    • Characterization of Daytime Sleepiness by Time–Frequency Measures of EEG Signals 

      Melia, Umberto; Guaita, Marc; Vallverdú, Montserrat; Clarià Sancho, Francisco; Montserrat i Capdevila, Josep; Vilaseca, Isabel; Salamero, Manel; Gaig, Carles; Caminal Magrans, Pere; Santamaria, Joan (Springer Verlag, 2015)
      Excessive daytime sleepiness (EDS) is one of the main symptoms of several sleep-related disorders with a great impact on patient lives. While many studies have been carried out in order to assess daytime sleepiness, automatic ...
    • Characterization of the cerebral activity by time-frequency representation of evoked EEG potentials 

      Clarià Sancho, Francisco; Vallverdú, Montserrat; Riba, Jordi; Romero, Sergio; Barbanoj, Manuel J.; Caminal Magrans, Pere (Institute of Physics and Engineering in Medicine, 2011-07-15)
      Métodos tradicionalmente utilizados para estudiar potenciales cerebrales relacionados con eventos (PRE) miden la amplitud y la duración de la forma de onda con el fin de cuantificar los cambios, siendo estas medidas ...
    • Choi-Williams distribution to describe coding and non-coding regions in primary transcript pre-mRNA 

      Melia, Umberto; Vallverdú, Montserrat; Clarià Sancho, Francisco; Gallardo, Juan J.; Perera, Alexandre; Caminal Magrans, Pere (Biomedical Engineering Society (Taiwan), 2013-05-28)
      En este trabajo se ha elegido un método numérico de conversión de la secuencia de nucleótidos pre-mRNA basado en la información termodinámica, asociada a los cambios de energía libre de esta secuencia, durante la formación ...
    • DNA Binding Site Characterization by Means of Rényi Entropy Measures on Nucleotide Transitions 

      Perera, Alexandre; Vallverdú, Montserrat; Clarià Sancho, Francisco; Soria, José Manuel; Caminal Magrans, Pere (Institute of Electrical and Electronics Engineers, 2008)
      —In this work, parametric information-theory measures for the characterization of binding sites in DNA are extended with the use of transitional probabilities on the sequence. We propose the use of parametric uncertainty ...
    • Filtering and thresholding the analytic signal envelope in order to improve peak and spike noise reduction in EEG signals 

      Melia, Umberto; Clarià Sancho, Francisco; Vallverdú, Montserrat; Caminal Magrans, Pere (Elsevier, 2014-03-28)
      To remove peak and spike artifacts in biological time series has represented a hard challenge in the last decades. Several methods have been implemented mainly based on adaptive filtering in order to solve this problem. ...
    • Measuring instantaneous and spectral information entropies by Shannon entropy of Choi-Williams distribution in the context of electroencephalography 

      Melia, Umberto; Clarià Sancho, Francisco; Vallverdú, Montserrat; Caminal Magrans, Pere (Multidisciplinary Digital Publishing Institute, 2014-05-09)
      The theory of Shannon entropy was applied to the Choi-Williams time-frequency distribution (CWD) of time series in order to extract entropy information in both time and frequency domains. In this way, four novel indexes ...
    • Removal of peak and spike noise in EEG signals based on the analytic signal magnitude 

      Melia, Umberto; Clarià Sancho, Francisco; Vallverdú, Montserrat; Caminal Magrans, Pere (IEEE, 2012-08)
      Peak and spike artifacts in time series represent a serious problem for signal analysis especially in biomedical field. From the last decades, different techniques have been used for their removal mainly based on adaptive ...
    • The Effects of Coronary Occlusion Location on the RR Signal 

      Clarià Sancho, Francisco; Vallverdú, Montserrat; Caminal Magrans, Pere (Institute of Electrical and Electronics Engineers, 2002)
      In this article, we carry out the study of the energy contribution of theRRsignal in the three frequency bands (LF, MF, and HF) during PTCA. Furthermore, variables based on instantaneous frequency and on group delay ...
    • Time-Frequency Characterization of Mismatch Negativity in Nociceptive Responses 

      Melia, Umberto; Vallverdú, Montserrat; Clarià Sancho, Francisco; Casanova, Jordi; Valls-Solé, Josep; Caminal Magrans, Pere (IEEE, 2011)
      An efficient way to investigate the neural basis of nociceptive responses is the event-related brain potentials (ERPs). One component belonging to this family of ERPs is the mismatch negativity (MMN). It reflects pre-attentive ...