Profound Haemodynamic Response in the Prefrontal cortex Induced by Musical Stimuli
2018
Blood-oxygen dynamics in response to prefrontal cortex (PFC) activity are
important for emotional responses to sensory stimuli, such as music. However, the
local neuronal circuits involved in the encoding of musical information by the PFC
remain unknown. We aimed to examine alterations in prefrontal activity patterns
while participants listened to musical pieces with different properties. Brain
function was examined in 28 participants (14 men, 14 women) while they listened
to two musical pieces (“Salut d’Amour” and “Pomp and Circumstance Marches”)
using functional near-infrared spectroscopy (fNIRS), electrocardiography, and
pulse oximetry. The delta oxyhemoglobin (ΔOxy-Hb) levels were significantly
reduced in the left lateral PFC during “Pomp and Circumstance Marches”, relative
to those observed during “Salut d’Amour”. Wavelet analyses of brain metabolism
revealed that “Salut d’Amour” altered brain activity between 0.015-0.030 Hz,
whereas “Pomp and Circumstance Marches” sparsely activated the brain at 0.015
Hz and activated the dorsolateral and orbitofrontal PFC at 0.030 Hz. These findings
demonstrate that different musical stimuli exert differential effects on brain
metabolism associated with neural activity in the PFC. These patterns may shed
light on the mechanisms underlying music processing in the brain, and the overall
role of music in promoting mental health and creation of better circumstances for
physiological conditions in human.
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