Low-Cost Functional Infrared Spectroscopy Based System as a Brain-Computer Interface

Functional infrared spectroscopy is a non-invasive, non-ionizing imaging method for measuring the functional hemodynamic response to brain activity. This study aims to explore the method, proposing the development of a functional prototype to measure hemodynamic activity on the scalp. At first, we outlined the application of functional infrared spectroscopy in scalp hemodynamic monitoring. The state-of-the-art section delves into the theoretical foundations of photoplethysmography, its functioning, physiological aspects, and clinical importance. Also, it discusses the current state of scalp hemodynamic monitoring systems, the principles of infrared spectroscopy, advantages, limitations, and relevant literature examples. We aimed to create an experimental demonstrator, from modeling to circuit design, assembly, and testing. The conclusions present the need for a non-invasive neuronal interfacing method, personal contributions, and potential future research directions.