User profiles for Lucas Parra

Lucas C. Parra

Professor of Biomedical Engineering, City College of New York, CUNY
Verified email at ccny.cuny.edu
Cited by 21855

Convolutive blind separation of non-stationary sources

L Parra, C Spence - IEEE transactions on Speech and Audio …, 2000 - ieeexplore.ieee.org
Acoustic signals recorded simultaneously in a reverberant environment can be described
as sums of differently convolved sources. The task of source separation is to identify the …

Cellular effects of acute direct current stimulation: somatic and synaptic terminal effects

…, M Arlotti, F Gasca, A Datta, LC Parra… - The Journal of …, 2013 - Wiley Online Library
Key points • The diversity of cellular targets of direct current stimulation (DCS), including
somas, dendrites and axon terminals, determine the modulation of synaptic efficacy. • Axon …

Recipes for the linear analysis of EEG

LC Parra, CD Spence, AD Gerson, P Sajda - Neuroimage, 2005 - Elsevier
In this paper, we describe a simple set of “recipes” for the analysis of high spatial density EEG.
We focus on a linear integration of multiple channels for extracting individual components …

Optimized multi-electrode stimulation increases focality and intensity at target

…, A Datta, M Bikson, Y Su, LC Parra - Journal of neural …, 2011 - iopscience.iop.org
Transcranial direct current stimulation (tDCS) provides a non-invasive tool to elicit
neuromodulation by delivering current through electrodes placed on the scalp. The present clinical …

Low-intensity electrical stimulation affects network dynamics by modulating population rate and spike timing

…, A Rahman, M Bikson, LC Parra - Journal of …, 2010 - Soc Neuroscience
Clinical effects of transcranial electrical stimulation with weak currents are remarkable
considering the low amplitude of the electric fields acting on the brain. Elucidating the processes …

Measurements and models of electric fields in the in vivo human brain during transcranial electric stimulation

…, X Wang, M Bikson, WK Doyle, O Devinsky, LC Parra - elife, 2017 - elifesciences.org
10.7554/eLife.18834.001 Transcranial electric stimulation aims to stimulate the brain by
applying weak electrical currents at the scalp. However, the magnitude and spatial distribution of …

[HTML][HTML] Inter-individual variation during transcranial direct current stimulation and normalization of dose using MRI-derived computational models

A Datta, D Truong, P Minhas, LC Parra… - Frontiers in …, 2012 - frontiersin.org
Background: Transcranial Direct Current Stimulation (tDCS) is a non-invasive, versatile, and
safe neuromodulation technology under investigation for the treatment of neuropsychiatric …

Convolutive blind source separation methods

MS Pedersen, J Larsen, U Kjems, LC Parra - Springer handbook of …, 2008 - Springer
In this chapter, we provide an overview of existing algorithms for blind source separation of
convolutive audio mixtures. We provide a taxonomy in which many of the existing algorithms …

Geometric source separation: Merging convolutive source separation with geometric beamforming

LC Parra, CV Alvino - IEEE Transactions on Speech and Audio …, 2002 - ieeexplore.ieee.org
Convolutive blind source separation and adaptive beamforming have a similar goal-extracting
a source of interest (or multiple sources) while reducing undesired interferences. A benefit …

List-mode likelihood: EM algorithm and image quality estimation demonstrated on 2-D PET

L Parra, HH Barrett - IEEE transactions on medical imaging, 1998 - ieeexplore.ieee.org
Using a theory of list-mode maximum-likelihood (ML) source reconstruction presented recently
by Barrett et al. (1997), this paper formulates a corresponding expectation-maximization (…