Research on the Factors Influencing Music Rhythm Memory by Near-Infrared Spectroscopy

This study aims to systematically monitor the changes in brain activity of undergraduate music major students under the auditory stimulation of music with or without rhythmic dynamics and music with different difficulty levels by functional near-infrared spectroscopy (fNIRS), specifically focusing on the concentration fluctuations of oxyhemoglobin and deoxyhemoglobin. From two dimensions, the rhythmic dynamics of music and the complexity of rhythms, deeply analyzes the potential impact of these two factors on rhythm memory. Methods: This study carefully recruited 25 first-year undergraduate music major students as experimental participants, with the help of fNIRS, a series of rhythm perception tasks based on music with or without rhythmic dynamics and with distinct difficulty variations were conducted on all participants. Results: The specific brain regions of participants in the rhythm perception tasks, such as the frontopolar area (FPA), the dorsolateral prefrontal cortex (DLPFC), and the Broca area, all presented significant activation responses. Concretely speaking, when facing low-difficulty rhythm stimulations, the activation level of the DLPFC was significantly higher than that under high-difficulty rhythm stimulations; in contrast, the activation of the Broca area was more significant under high-difficulty rhythm stimulations. It is worth noting that regardless of whether the music had evident rhythmic dynamics, the activation levels of the FPA did not show significant differences. Conclusions: the changes in the rhythmic dynamics had no significant impact on the accuracy of rhythm memory; however, the difficulty levels of rhythms had a substantial and profound effect on the process of rhythm memory and notation.