A baby’s first babbling sounds are not just noise—they are a learning system, where the infant’s own vocalisations create a rich stream of sensory feedback that may teach them how language works. This research argues that current efforts to close the vocabulary gap between children from richer and poorer homes have overlooked the first year of life, focusing instead on later interventions that often fail. By age one, the foundation for language may already be set, and simply changing a toddler’s environment after that point shows little effect. The project proposes that sensorimotor feedback—the simultaneous sensations of hearing, feeling, and moving the mouth during babbling—is a crucial but unexplored mechanism for early language learning. If this framework holds, it could shift early-years policy and parenting advice toward supporting pre-speech vocal development, rather than waiting until children are already behind. This is fundamental science: it asks how infants learn at all, not how to fix a problem after it appears. Understanding that mechanism could eventually lead to targeted interventions for children at risk of language delay, but the immediate goal is to map a process that has remained invisible.
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Language abilities by age 3 predict a child's later academic achievements. This offers an important opportunity to narrow the achievement gap between children from richer and poorer homes: by finding ways to expand a child's vocabulary, those from lower-income homes may have better life chances. This has led to an emphasis on vocabulary development research, which shows a clear link between a child's early language environment and their later vocabulary. However, interventions reveal that this problem is not easy to resolve; by the second year, positive changes to the linguistic environment do not have any clear effects on a child's vocabulary. By age 1, the foundation may already have been set for a child's future language skills; to address the word gap problem a focus-shift is required towards vocal development during the first year of life. The proposed research offers a novel perspective that emphasises this period as a crucial window for learning even before an infant has begun to speak. This is due to the role of sensorimotor feedback: a network of simultaneous sensory events that occur when infants vocalize, including proprioception, muscular function, and auditory input. These sensorimotor events, or mappings, may offer a rich learning opportunity that has as-yet untapped potential in understanding how infants learn to talk. This research presents a new framework for understanding language development through a focus on sensorimotor feedback, which may be a key missing link between the language a child hears in the home and their vocabulary by school-age. A combination of naturalistic and experimental data will present a novel view of sensorimotor feedback in relation to 1) the early environment and 2) later vocabulary, drawing on advanced methods in phonetics and developmental psychology to propose a new framework for understanding how infants learn and, subsequently, addressing the achievement gap.
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