Brain 2 Nervous System Physiological Phenomena brain 2 diagnostic imaging 2 nervous system function 2 procedures 2 Adult 1 BOLD signal 1 Cardiovascular Physiological Phenomena 1 Female 1 Humans 1 Magnetic Resonance Imaging 1 Male 1 Middle Aged 1 Neuroimaging 1 Oxygen 1 Respiratory Physiological Phenomena 1 Spectroscopy, Near-Infrared 1 adult 1 amplitude of low-frequency fluctuation 1 article 1 blood vessel 1 brain radiography 1 breathing 1 cardiorespiratory modulation 1 cardiovascular function 1 cerebrospinal fluid 1 fast fMRI 1 female 1 functional magnetic resonance imaging 1