Visual and auditory orienting responses in preterm infants: a comparison of three cohorts over time

Area of Science:

• Developmental Psychology
• Neonatology
• Neuroscience

Background:

• Preterm infants exhibit varying developmental trajectories.
• Neonatal intensive care practices have evolved significantly since the late 20th century.
• Understanding sensory orienting responses is crucial for assessing preterm infant development.

Purpose of the Study:

• To compare visual and auditory orienting responses in preterm infants across different gestational age groups.
• To examine changes in these responses over time, correlating with advancements in neonatal care.
• To investigate the impact of perinatal variables on infant orienting behaviors.

Main Methods:

• Comparison of visual and auditory orienting responses in three cohorts of preterm infants (N=351) born between 1977-1987.
• Infants categorized into two groups: 25-34 weeks gestational age (n=140) and 35-37 weeks gestational age (n=211).
• Analysis of covariance used to adjust for perinatal variables, assessing responses to visual (bull's-eye) and auditory (rattle, bell, voice, face+voice) stimuli.

Main Results:

• Significant differences were observed between cohorts in orienting to the bull's-eye stimulus for both infant groups.
• A trend indicated differences in orienting to the rattle stimulus for the 25- to 34-week gestational age group.
• Adjustments for perinatal variables did not alter the primary findings regarding bull's-eye orienting.

Conclusions:

• Advancements in neonatal intensive care have led to improved behavioral outcomes for preterm infants.
• Sensory orienting responses show variations influenced by gestational age and potentially by changes in medical care over time.
• Further research is warranted to fully elucidate the long-term impact of neonatal care on sensory processing in preterm populations.