Studying Newborns' Brain Activity in the NICU Through a Musical Intervention: the Role of Fundamental Frequency

Inclusion Criteria: * Born at (equal or less than) 32 weeks of gestation * Absence of auditory insufficiency in the 8th cranial nerve and excessive pathology in the brainstem * Negative bilateral "transient evoked otoacoustic emissions," indicating unresponsiveness of the inner ear to an acoustic stimulus. * Weighing 1000 grams or more * In stable health conditions with no imminent risk of death * Not sedated * Absence of neonatal sepsis. * No congenital, genetic, or chromosomal abnormalities. * No nuclear jaundice. * No maternal use of illicit drugs during pregnancy. * No necessity for mechanical ventilation that creates excessive noise (i.e., high-frequency oscillatory ventilation). * No need for sedative drug administration to the neonate. * Absence of endocrine disorders (e.g., congenital hypothyroidism). Exclusion Criteria: * If a newborn is diagnosed with a disease or dysfunction during the study and the medical staff recommends their removal, they will be automatically excluded from the recruited sample. * Use of other music stimulation during the implementation of the intervention period