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UBC Theses and Dissertations

Focused attention and heart rate during exploratory play in healthy preterm and term-born infants Petrie Thomas, Julianne


Infant attention is central to early development. Previous research has linked focused attention during infant exploratory play to preschool cognition. Importantly, focused attention and information processing have been related to sustained decreases in heart rate (HR), which show developmental changes in infancy. Few studies have examined the relationship between focused attention, heart rate and development in very preterm infants, who are vulnerable to cognitive and attention problems. Participants were 35 extremely low gestational age (ELGA; ≤28 weeks), 48 very low gestational age (VLGA; 29-32 weeks) and 46 healthy term-born infants seen at 8- months corrected age. Focused attention was timed and global focused attention was rated using a toy exploration paradigm. Heart rate was recorded continuously during attention testing. Mean HR and heart rate variability (HRV) were assessed during infant exploration. Additionally, change in mean HR for all focused episodes, and the mean and greatest HR change for the peak focus were calculated. Bayley Scales of Infant Development (BSID-II, Mental Development Index [MDI]) were administered. Term-born infants were rated higher on global focused attention than VLGA, and marginally higher than ELGA infants. For all infants, greater HRV suppression during exploration and magnitude ofHR deceleration during the peak focus were related to greater attentiveness. No group differences were seen in HRV suppression. However, ELGA infants showed greater HR deceleration during focused attention compared to VLGA and Term-born infants. Furthermore, after controlling for perinatal risk, infant peak focus and degree of HR deceleration predicted 8-month MDI for the ELGA (49% of the total variance), but not VLGA infants. This may reflect enhanced attentional effort to compensate for information processing deficits among the highest risk infants. These findings extend research on attention and heart rate during exploratory play to understanding the links between attention regulation, heart rate and cognitive development in very preterm infants. Further knowledge in this area will facilitate the development of effective methods to identify infants very early in life who are at-risk for attention and cognitive problems, and may lead to interventions that can improve developmental outcomes for vulnerable infants.

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