Theta oscillations in 4-year-olds are sensitive to task engagement and task demands

Meyer, Marlene; Endedijk, Hinke M.; van Ede, Freek; Hunnius, Sabine · 2019 · Crossref

DOI: 10.1038/s41598-019-42615-x

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Summary

This study investigates whether theta oscillations in 4-year-old children reflect top-down control processes, specifically sensitivity to task engagement and cognitive demands. While adult research establishes frontal theta oscillations as critical for guiding attention and working memory via top-down control, evidence in early childhood remains scarce. Previous infant studies were limited by the inability to impose external tasks, leaving it unclear if theta oscillations in young children support instructed, goal-directed behavior rather than just bottom-up, stimulus-driven processing. This gap is significant because top-down control is essential for the increasingly complex tasks required as children approach school age. To address this, the authors conducted an EEG study with 29 typically developing 4-year-olds using a within-subjects design. Participants viewed short movie clips under three conditions: a "No Task" condition (passive viewing), a "Color-naming Task" (language-related demand), and an "Imitation Task" (action-related demand). To isolate top-down effects from bottom-up sensory inputs, the researchers compared neural activity during periods where visual stimuli were identical. Task engagement was assessed by comparing theta power (3–6 Hz) during fixation cross presentations between task and no-task conditions. Task demands were compared by analyzing theta power during identical action clips while children prepared for either color naming or imitation. Data were analyzed using cluster-based permutation tests, with the theta band defined specifically for this age group. The results demonstrated that theta power was significantly higher when children were engaged in a task compared to when they were not, particularly over frontomedial sites. This indicates that theta oscillations in preschoolers are sensitive to the presence of a cognitive goal. Furthermore, theta power increased over time during sustained task engagement, suggesting a buildup of top-down control as attention and encoding demands persisted. Regarding specific task demands, theta power was stronger over left fronto-temporal sites during the language-related Color-naming Task compared to the action-related Imitation Task. This topographical difference suggests that theta oscillations are modulated by the specific cognitive networks recruited for different types of top-down control. These findings extend the neurocognitive framework of theta oscillations to early childhood, providing evidence that frontal theta reflects top-down control processes in 4-year-olds, not just bottom-up attention. The study confirms that despite the immaturity of frontal brain regions, preschoolers utilize theta oscillations to guide attention and working memory toward task-relevant information. The sensitivity of theta power to both general task engagement and specific cognitive demands supports the view that theta oscillations play a unifying role in coordinating diverse cognitive processes in developing brains, mirroring mechanisms observed in adults.

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