Animal model studies indicate light-absorption changes of the exposed animal brain in
response to visual stimulation. Here we report observations of red-light absorbance …

Brain activity is associated with physiological changes, which alter the optical properties of
the tissue in the near‐infrared part of the spectrum. Two major types of optical signals …

Sinusoidally modulated light, even at low percentages of modulation, gives rise to occipital
responses, sometimes large. They may reproduce rather well the input sine wave in shape …

Fast optical signals can be used to study the time course of neuronal activity in localized
cortical areas. The first report of such signals [Gratton, G., Corballis, PM, Cho, E., Fabiani, M …

Recent theories about human brain function emphasize the need for imaging methods that
allow the study of dynamic interactions among different structures. In this paper, we report on …

Measures of parameters of the migration of near-infrared photons through the head
(attenuation, or intensity, and time-of-flight, or delay) have been proposed as a way of …

This work is the first to report optical intensity changes (ΔI/I≈ 0.05%) with a latency between
60 and 160ms after electrical median nerve stimulation at 5Hz detected non-invasively …

Non–invasive techniques for the study of human brain function based on changes of the
haemoglobin content or on changes of haemoglobin saturation have recently been …

Various factors, including variations in the concentration of hemoglobin, determine changes
in the transparency of living tissue to near‐infrared light. Hence, optical measures have …

1. A marked difference was obtained in the averaged electrical responses of normal subjects
when patterned light was used for stimulation instead of diffuse light. This difference is …