Spontaneous slow oscillation-associated slow wave activity represents an internally generated state which is characterized by alternations of network quiescence and stereotypical episodes of neuronal activity - slow wave events. However, it remains unclear which macroscopic signal is related to these active periods of the slow wave rhythm. We used optic fiber-based calcium recordings of local n...

The blood oxygenation level-dependent (BOLD) functional MRI response to suppressive neural activity has not been tested on a fine spatial scale. Using Gabor patches placed in the near periphery, we precisely localized individual regions of interest in primary visual cortex and measured the response at a range of contrasts in two different contexts: with parallel and with orthogonal flanking Gab...

We have measured the relationship between image contrast, perceived contrast, and BOLD fMRI activity in human early visual areas, for natural, whitened, pink noise, and white noise images. As root-mean-square contrast increases, BOLD response to natural images is stronger and saturates more rapidly than response to the whitened images. Perceived contrast and BOLD fMRI responses are higher for p...

at 7T Dávid Z Balla, Rosa M Sanchez Panchuelo, Samuel J Wharton, Gisela E Hagberg, Klaus Scheffler, Susan T Francis, and Richard W Bowtell High-field MR Centre, Max Planck Institute for Biological Cybernetics, Tübingen, Germany, Sir Peter Mansfield Magnetic Resonance Centre, University of Nottingham, Nottingham, United Kingdom, Department for Biomedical Magnetic Resonance Imaging, University of...

The baryon fraction of galaxy clusters in numerical simulations is found to be dependant on the cluster formation method. In all cases, the gas is anti-biased compared with the dark matter. However, clusters formed hierarchically are found to be more depleted in baryons than clusters formed non-hierarchically. There is a depletion of 10 to 15% for hierarchically formed clusters while the deplet...

This paper proposes a definition of Schelling’s model of segregation using generalized derangements. Many of urban or territorial modellings are based on decentralized approaches where rule-based systems have to be integrated inside a whole interaction system to describe complex phenomena. The goal of these decentralized modellings is to deal with emergent computing able to detect dynamically e...

INTRODUCTION Prognosis is particularly poor for cervical cancer patients who present with large hypoxic tumors. While tumor size can be assessed non-invasively, invasive electrodes have been required to measure oxygenation. A noninvasive assessment would be particularly attractive to patients and physicians and potentially allow the design of personalized medicine regimes (1). BOLD (Blood Oxyge...

The blood-oxygen-level dependent (BOLD) signal in functional MRI (fMRI) reflects both neuronal activations and global physiological fluctuations. These physiological fluctuations can be attributed to physiological low frequency oscillations (pLFOs), respiration, and cardiac pulsation. With typical TR values, i.e., 2 s or longer, the high frequency physiological signals (i.e., from respiration a...

Volumetric Space–Time Structure of Physiological Noise in BOLD fMRI Arno Solin, Simo Särkkä, Aapo Nummenmaa, Aki Vehtari, Toni Auranen, Simo Vanni, and Fa-Hsuan Lin Department of Biomedical Engineering and Computational Science, Aalto University, Espoo, Finland, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Boston, MA, United States, Advanced Magnetic Imag...

Manuscript for The new handbook of multisensory processes, Barry Stein (Ed.).