Adult 1 BOLD signal 1 Brain 1 Cardiovascular Physiological Phenomena 1 Female 1 Humans 1 Magnetic Resonance Imaging 1 Male 1 Middle Aged 1 Nervous System Physiological Phenomena 1 Neuroimaging 1 Respiratory Physiological Phenomena 1 adult 1 amplitude of low-frequency fluctuation 1 article 1 blood vessel 1 brain 1 brain radiography 1 breathing 1 cardiorespiratory modulation 1 cardiovascular function 1 cerebrospinal fluid 1 diagnostic imaging 1 fast fMRI female 1 functional magnetic resonance imaging 1 global signal 1 gray matter 1 heart 1 human 1