Results 71 to 80 of about 348,367 (159)

A lite parametric model for the Hemodynamic Response Function [PDF]

arXiv, 2020
When working with task-related fMRI data, one of the most crucial parts of the data analysis consists of determining a proper estimate of the BOLD response. The following document presents a lite model for the Hemodynamic Response Function HRF. Between other advances, the proposed model present less number of parameters compared to other similar HRF ...
arxiv  

Noise reduction in functional near-infrared spectroscopy signals by independent component analysis [PDF]

, 2015
Functional near-infrared spectroscopy (fNIRS) is used to detect concentration changes of oxyhemoglobin and deoxy-hemoglobin in the human brain. The main difficulty entailed in the analysis of fNIRS signals is the fact that the hemodynamic response to a ...
Friston K. J., Gonzales R., Hendrik Santosa, Keum-Shik Hong, Melissa Jiyoun Hong, Sung-Phil Kim, Turnip A.   +6 more
core   +1 more source

Combining magnetic resonance imaging with readout and/or perturbation of neural activity in animal models: Advantages and pitfalls

Frontiers in Neuroscience, 2022
One of the main challenges in brain research is to link all aspects of brain function: on a cellular, systemic, and functional level. Multimodal neuroimaging methodology provides a continuously evolving platform.
Lauren Kosten, Serena Alexa Emmi, Stephan Missault, Georgios A. Keliris, Georgios A. Keliris   +4 more
doaj   +1 more source

Substantia nigra activity level predicts trial-to-trial adjustments in cognitive control [PDF]

, 2011
Effective adaptation to the demands of a changing environment requires flexible cognitive control. The medial and the lateral frontal cortices are involved in such control processes, putatively in close interplay with the BG.
Bunzeck, Nico, Böhler, Nico, Heinze, Hans-Jochen, Hopf, Jean-Yves, Krebs, Ruth, Münte, Thomas F, Noesselt, Toemme, Schoenfeld, Mircea A, Woldorff, Marty G   +8 more
core   +1 more source

Early Detection of Hemodynamic Responses Using EEG: A Hybrid EEG-fNIRS Study

Frontiers in Human Neuroscience, 2018
Enhanced classification accuracy and a sufficient number of commands are highly demanding in brain computer interfaces (BCIs). For a successful BCI, early detection of brain commands in time is essential.
M. Jawad Khan, M. Jawad Khan, Usman Ghafoor, Keum-Shik Hong, Keum-Shik Hong   +4 more
doaj   +1 more source

Reconstructing the Hemodynamic Response Function via a Bimodal Transformer [PDF]

arXiv, 2023
The relationship between blood flow and neuronal activity is widely recognized, with blood flow frequently serving as a surrogate for neuronal activity in fMRI studies. At the microscopic level, neuronal activity has been shown to influence blood flow in nearby blood vessels.
arxiv  

The application of near infrared spectroscopy in nutritional intervention studies [PDF]

, 2013
Functional near infrared spectroscopy (NIRS) is a non-invasive optical imaging technique used to monitor cerebral blood flow (CBF) and by proxy neuronal activation.
Jackson, Philippa, Kennedy, David
core   +2 more sources

Continuous monitoring of brain dynamics with functional near infrared spectroscopy as a tool for neuroergonomic research: Empirical examples and a technological development

Frontiers in Human Neuroscience, 2013
Functional near infrared spectroscopy (fNIRS) is a noninvasive, safe and portable optical neuroimaging method that can be used to assess brain dynamics during skill acquisition and performance of complex work and everyday tasks. In this paper we describe
Hasan eAyaz, Banu eOnaral, Kurtulus eIzzetoglu, Patricia A Shewokis, Patricia A Shewokis, Ryan eMcKendrick, Raja eParasuraman   +6 more
doaj   +1 more source

Regularized brain reading with shrinkage and smoothing [PDF]

, 2016
Functional neuroimaging measures how the brain responds to complex stimuli. However, sample sizes are modest, noise is substantial, and stimuli are high dimensional. Hence, direct estimates are inherently imprecise and call for regularization. We compare
Ramdas, Aaditya, Shalizi, Cosma Rohilla, Steorts, Rebecca C., Wehbe, Leila   +3 more
core   +1 more source

Age-related changes in global motion coherence: conflicting haemodynamic and perceptual responses [PDF]

, 2018
Our aim was to use both behavioural and neuroimaging data to identify indicators of perceptual decline in motion processing. We employed a global motion coherence task and functional Near Infrared Spectroscopy (fNIRS). Healthy adults (n = 72, 18-85) were
A Arena, A Brodtmann, A Villringer, AJ Simmers, B Händel, B Rosengarten, B Sun, B Zalar, B Zimmerman, CK Tamnes, CL Grady, CM Stoppel, CR Pernet, CV Hutchinson, CV Hutchinson, DB Tran, DC Park, DD Garrett, E Maggioni, E O’Connor, E Roudaia, EG Conlon, EG Conlon, ER Sowell, FA Sorond, G Gratton, G Jasdzewski, G Maehara, G Porter, G Rees, GA Rousselet, GB Remijn, GC Gilmore, GL Trick, H Jasper, H Kojima, H Nakamura, HA Allen, HC Agnew, J Billino, J Carp, J Grinband, JD Bower, JF Norman, JH Meek, K Ball, KM Rodrigue, KS Pilz, KS Pilz, L Koessler, L Tang, L-C Chen, LG-G Bogfjellmo, LM Ward, M Kuba, MA McIntosh, MJ Herrmann, ML Schroeter, MM Bieniek, MW Voss, N Bocheva, N Raz, N Raz, OJ Braddick, P Atchley, PA Reuter-Lorenz, PJ Bennett, PJ Knox, R Gatto, R Jurca, R Wojciechowski, RB Tootell, RB Tootell, RF Helfrich, RJ Snowden, S Ajina, S Fantini, S Gilaie-Dotan, S Koyama, S Narasimhan, S Peca, S Sunaert, S Wijeakumar, S Wijeakumar, SC Biehl, SN Thiyagesh, T Hashimoto, T Näsi, TC Emmerling, TJ Huppert, V Kavcic, V Toronov, WNJM Colier, Y Kamitani   +93 more
core   +3 more sources