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Check out the visualization: http://www.forbes.com/2010/12/21/speechome-interactive-visualization-language-acquisition.html "This interactive visualization provides a look into the most complete record of a single child's speech development ever created... But parentese is not universal. It varies between different parents and cultures, and in some cases has been reported to be absent altogether. What effect, then, does it have on child development? Answering this question could help guide better ways to help children that have difficulty learning language." With links to the actual studies at the bottom of the page.

Sociolinguist Gavin Lamb examines how people use language to build social relationships with non-human beings, like dogs. He cites the research of Alexandra Horowitz, a dog-cognition scientist who studied verbal human-dog interaction. Some interesting findings: 1. Humans use dog-directed parentese for attention-getting, positive-affect, using a higher pitch, like we might for babies/toddlers. 2. Talking to dogs serves as a social lubricant for starting up conversations, or diffusing tense situations with other humans. 3. Asking rhetorical, unanswerable questions, e.g. "What's up, buddy?": an example of phatic communication, which is not information-driven, but which helps establish or maintain social relationships. The language serves a socio-pragmatic, rather than denotative function.

Elise Piazza, lead author and a postdoctoral research associate with the Princeton Neuroscience Institute, said, "Motherese contains exaggerated pitch contours and repetitive rhythms that help babies segment the complex noises around them into building blocks of language." She added that the speaking style also helps parents capture the attention of their babies and engage them emotionally.

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