Matti Järvelä

This study investigates cross-frequency oscillatory interactions in brain pulsations during awake and NREM-sleep states, revealing directional coordination mechanisms between infra-slow, respiratory, and cardiovascular oscillations.

This study introduces MREGRHP, a frequency domain imaging method, and finds reduced harmonic complexity in brain pulse waveforms in Alzheimer's disease patients.

This study uses fast fMRI to compare brain pulsation patterns in healthy awake individuals, healthy sleepers, and narcolepsy type 1 patients, revealing how hypocretin deficiency affects cerebrospinal fluid dynamics.

The paper measures CSF flow velocity during sleep and finds it increases due to stronger vasomotor and respiratory pulsations, while cardiovascular speed remains unchanged.

This study examines cardiovascular and vasomotor pulsations in the brain and periphery during awake and NREM sleep using fMRI and photoplethysmography, finding increased synchrony and power in vasomotor waves during sleep.

This study investigates how infra-slow fluctuations and respiratory rhythms influence fast cortical EEG oscillations during wakefulness and sleep, finding that slow signals drive fast oscillations with stronger coupling during sleep.

This study quantifies how sleep affects physiological brain pulsations and shows that spectral entropy of these pulsations can distinguish sleep from awake states.