Background Brain activity has been investigated by several methods with different
principles, notably optical ones. Each method may offer information on distinct physiological …

Brain activity is associated with changes in optical properties of brain tissue. Optical
measurements during brain activation can assess haemoglobin oxygenation, cytochrome-c …

Diffuse optical imaging (DOI) alone offers the possibility of simultaneously and noninvasively
measuring neuronal and vascular signals in the brain with temporal resolution of up to 1 ms …

We investigate the intersubject signal variability of near-infrared spectroscopy (NIRS), which
is commonly used for noninvasive measurement of the product of the optical path length and …

Several functional near-infrared spectroscopy (fNIRS) studies report their findings based on
changes of a single chromophore, usually concentration changes of oxygenated …

We will describe the working principles of fNIR and how the hemodynamic signals are
extracted from the raw fNIR measurements using the modified Beer-Lambert Law. We will …

We present a novel probe design which enables simultaneous electroencephalography
(EEG) and near-infrared (NIR) optical imaging to be performed in a manner which is easy to …

While the ability of near-infrared spectroscopy (NIRS) to measure cerebral hemodynamic
evoked responses (slow optical signal) is well established, its ability to measure non …

Several functional brain mapping techniques have been developed over the past 3 decades
which have revolutionized our ability to map activity in the living brain, including positron …

Near-infrared spectroscopy is a non-invasive optical method used to detect functional
activation of the cerebral cortex. Cognitive, visual, auditory and motor tasks are among the …