Abstract: Optical source and detector arrangements, systems, and methods are described, which may be used to provide or analyze information about a subject, including hemoglobin and deoxygenated hemoglobin concentrations. Multiple optical detectors can be positioned at different distances from an optical source. The optical sources may irradiate the subject with optical signals and the optical detectors can detect the optical signals from the optical sources after passing through the subject. Analysis of the detected signals source can yield information about the subject.

Abstract: Supports for optical sensors are described. The supports may allow for placement of the optical sensors in close proximity or contact with a subject, such as supporting the optical sensors against a subject's head. The supports may include multiple pieces that can be connected or disconnected. Mechanisms for adjusting the pressure of the optical sensors against the subject may be included with the supports.

Abstract: Optical sensors, systems, and methods are described, which may be used to provide or analyze information about a subject. The optical sensor may be placed in proximity to the subject and may include optical sources and optical detectors. The optical sources may irradiate the subject with optical signals and the optical detectors can detect signals from the subject. Analysis of the detected signals can yield information about the subject.

Abstract: Optical sensors, systems, and methods are described, which may be used to provide or analyze information about a subject. The optical sensor may be placed in proximity to the subject and may include optical sources and optical detectors. The optical sources may irradiate the subject with optical signals and the optical detectors can detect signals from the subject. Analysis of the detected signals can yield information about the subject.