Group items tagged

Without understanding the 'referential function' of language (words as 'verbal labels', symbolizing other things) it is impossible to learn a language. Is this implicit knowledge already present early in infants? Marno, Nespor, and Mehler of the International School of Advanced Studies conducted experiments with infants (4 months old). Babies watched a series of videos where a person might (or might not) utter an (invented) name of an object, while directing (or not directing) their gaze towards the position on the screen where a picture of the object would appear. By monitoring the infants' gaze, Marno and colleagues observed that, in response to speech cues, the infant's gaze would look faster for the visual object, indicating that she is ready to find a potential referent of the speech. However, this effect did not occur if the person in the video remained silent or if the sound was a non-speech sound. "The mere fact of hearing verbal stimuli placed the infants in a condition to expect the appearance, somewhere, of an object to be associated with the word, whereas this didn't happen when there was no speech, even when the person in the video directed the infant's gaze to where the object would appear, concludes Marno. "This suggests that infants at this early age already have some knowledge that language implies a relation between words and the surrounding physical world. Moreover, they are also ready to find out these relations, even if they don't know anything about the meanings of the words yet. Thus, a good advice to mothers is to speak to their infants, because infants might understand much more than they would show, and in this way their attention can be efficiently guided by their caregivers."

Dr. Mitsuhiko Ota, a linguist in the University of Edinburgh Language Sciences department, was the lead researcher in a 2018 study (Ota, Davies-Jenkins, and Skarabela 2018) examining infant-directed speech, a.k.a. baby talk. Across languages, lexical items specific to infant-directed speech (i.e., 'baby-talk words') are characterized by three major features: 1. onomatopoeia incorporated into non-arbitrary, "highly iconic" words, e.g. "quack", "bow wow" 2. diminutives, e.g. "daddy", "tummy" 3. reduplication, e.g. "din din", "easy peasy" These three lexical characteristics may help infants discover the referential nature of words, identify word referents, and segment fluent speech into words. If so, the amount of lexical input containing these properties should predict infants' rate of vocabulary growth. To test this prediction, Ota's team tracked the vocabulary size in 47 English-learning infants from 9 to 21 months and examined whether vocabulary growth was related to measures of iconicity, diminutives, and reduplication in the lexical input at 9 months. The team's analyses showed that both diminutives and reduplication in the input were associated with vocabulary growth, although measures of iconicity were not. These results are consistent with the hypothesis that phonological properties typical of lexical input in infant-directed speech play a role in early vocabulary growth.

Researchers at the University of Washington developed a play-based, intensive, English-language method and curriculum and implemented the research-based program in four public infant-education centers in Madrid, Spain. Based on years of UW's I-LABS (Institute of Learning and Brain Science) research on infant brain and language development, UW's pilot bilingual education method utilized the following brain-research principles: 1. social interaction 2. play 3. high quality and quantity of language from the teachers. 4. Use of "infant-directed speech", or "parentese": the speech style parents use to talk to their babies, which has simpler grammar, higher and exaggerated pitch, and drawn-out vowels. 5. Active child engagement. The country's extensive public education system enabled the researchers to enroll 280 infants and children from families of varying income levels. Babies aged 7 to 33.5 months were given one hour of English sessions a day, using the UW method, for 18 weeks, while a control group received the Madrid schools' standard bilingual program. Both groups of children were tested in Spanish and English at the start and end of the 18 weeks. Children who received the UW method showed rapid increases in English comprehension and production, and significantly outperformed the control group peers at all ages on all tests of English. By the end of the 18-week program, the children in the UW program produced an average of 74 English words or phrases per child, per hour; children in the control group produced 13 English words or phrases per child, per hour. This 3 minute video succinctly captures the study: https://www.youtube.com/watch?v=HE5fBAS6gf4

This seminal longitudinal study, conducted by Goodwyn, Acredolo and Brown (2000), evaluated the benefits of purposefully encouraging hearing infants to use simple gestures as symbols for objects, requests, and conditions. Researchers measured the receptive and expressive language abilities of 103 babies via standardized language tests at the age of 11, 15, 19, 24, 30, and 36 months. Their findings suggest that symbolic gesturing does not hamper children's early verbal development, and may even facilitate it. The possible reasons underlying the results: increases in infant-directed speech, infant-selected topic selection, and scaffolding that encourages communication.