Early cognitive assessment in premature infants: the discriminatory value of eye-tracking vs. Bayley Scales

TL;DR

Eye-tracking can detect cognitive differences in premature infants as early as 8-9 months, offering a more sensitive tool than traditional assessments like the Bayley Scales.

Contribution

A novel eye-tracking paradigm for assessing visual working memory and attention in infants, showing higher discriminatory power than Bayley Scales for preterm infants.

Findings

Eye-tracking data showed significant group differences in visual working memory between preterm and full-term infants.

Preterm infants with fetal growth restriction had measurable eye-tracking performance effects not captured by Bayley scores.

Eye-tracking is a non-intrusive, short-duration method for early cognitive assessment in preterm infants.

Abstract

The testing of visuocognitive development in preterm infants shows strong interactions between perinatal characteristics and cognition, learning and overall neurodevelopment evolution. The assessment of anticipatory gaze data of object-location bindings via eye-tracking can predict the neurodevelopment of preterm infants at the age of 3 years; little is known, however, about the early cognitive function and its assessment methods during the first year of life.

The current study presents data from a novel assessment tool, a Delayed Match Retrieval (DMR) paradigm via eye-tracking was used to measure visual working memory (VWM) and attention skills. The eye-tracking task that was designed to measure infants’ ability to actively localize objects and to make online predictions of object-location bindings. 63 infants participated in the study, 39 preterm infants and 24 healthy full term infants – at a corrected age of 8–9 months for premature infants and similar chronological age for full term infants. Infants were also administered the Bayley Scales of Infant and Toddler Development.

The analysis of the Bayley scores showed no significant difference between the two groups while the eye-tracking data showed a significant group effect on all measurements. Moreover, preterm infants’ VWM performance was significantly lower than full term’s. Birth weight affected the gaze time on all Areas Of Interest (AOIs), overall VWM performance and the scores at the Cognitive Bayley subscale. Furthermore, preterm infants with fetal growth restriction (FGR) showed significant performance effects in the eye-tracking measurements but not on their Bayley scores verifying the high discriminatory value of the eye gaze data.

Visual working memory and attention as measured via eye-tracking is a non-intrusive, painless, short duration procedure (approx. 4-min) was found to be a significant tool for identifying prematurity and FGR effects on the development of cognition during the first year of life. Bayley Scales alone may not pick up these deficits. Identifying tools for early neurodevelopmental assessments and cognitive function is important in order to enable earlier support and intervention in the vulnerable group of premature infants, given the associations between foundational executive functional skills and later cognitive and academic ability.

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