Effect of Maternal Speech on Neural Development in Premature Infant

Maternal speech has been shown to benefit premature infants by improving feeding outcomes and potentiating the development of the auditory cortex. To our knowledge, limited studies have addressed the benefits of exposure to maternal speech on neural development in premature infants. The objective of this study was to investigate the effect of early controlled exposure to maternal recording a passage of speech on heart rate variability (obtained before, during, and after playback of a test stimulus of a female stranger speaking the same passage) in very low-birth-weight premature infants tracked weekly from 28 to 34 weeks.

Prospective, randomized controlled trial, longitudinal, and repeated-measures design were conducted on 49 subjects. Infants heard a recording of their mother's speech twice a day from either 28 to 34 weeks (group 1) or from 32 to 34 weeks (group 2). Spectral analysis was measured weekly for 45 seconds before, during, and after playback of maternal speech. A generalized linear mixed model was conducted to examine the 2-way interaction in the log high-frequency power between groups, genders, sessions, and conditions.

It was found that there were no significant differences between groups before, during, and after playback of the stimulus. A significant difference, however, was noted between conditions (before vs during period).

It can be concluded cautiously that playing back of maternal speech recordings to the premature infant has a beneficial impact on neural development after 32 weeks gestational age.