Dec 9 ===== Polka/etal:2008 --------------- Polka et al. discuss the impact of physiological abnormalities on infants' speech perception ala non-hearing infants, and those with (or with history of) MEO. They also discuss the view that infant babble is a reproduction/reinforcement technique used to acquire language features. Do we have any research to suggest that the other side of the coin, ie. physiological abnormalities in infants' speech production, like those with cleft lip/palate for example, has an impact on child speech production, such as children who develop speech disorders/impairments? Could we use the methods described by Kuhl et al.(2014) to learn more about the interaction of speech perception and production during infancy? With regard to the language filter: at what age can we consider the language filter to be "fully developed" and is there any evidence to suggest a similar timescale of development of the filter cross-linguistically? The paper brings up the outlook of the research in the future. How has it changed since then? "Two developmental changes in infant vowels occur during the first year: first, more vowels with full oral resonance are produced in comparison to vowels with nasal resonance; subsequently, the infant's vowel repertoire expands to include the point vowels (/i/, /a/, /u/) in addition to the predominant low and central vowels." Is this a universal observation or can it vary by the language the infant is learning? How does discrimination in contrasts is measured at such young age? What does it mean for a model (such as DIVA) to be self-organizing?