Reading focus
Syllabus: How Do Infants Build Knowledge and Skills?
Revisit the perceptual reorganization question through an exposure intervention. Compare learning from complex speech in live and recorded settings with learning from Saffran and colleagues’ controlled stream.
A question to consider. Why would different outcomes in these studies not establish that either social interaction or statistical regularity is the sole basis of infant learning?
Why this reading
Exposure is not just an amount of information: it also occurs in a setting. Kuhl and colleagues examine phonetic learning following encounters with live speakers or recordings. The experiments make it possible to ask which features of an encounter help infants learn, and which remain bundled together.
Before you read
Phonetic learning here concerns discrimination between speech sounds, not vocabulary or fluency. Infant-directed speech is speech addressed to an infant; it is not synonymous with one acoustic feature. Random assignment supports comparison of the conditions assigned within an experiment, while comparisons across experiments require additional care.
Read for
- Identify the live-language intervention and its control, including the allocation of infants, exposure schedule, and later discrimination measure.
- Compare the live, audiovisual-recording, and audio-recording conditions. What is held similar, and which features of the learning situations still differ?
- Separate the demonstrated effect of the exposure arrangement from the proposed roles of attention, motivation, gaze, and social interaction.
Consider afterwards
- Design a comparison of contingent and noncontingent interaction that would help distinguish social responsiveness from the amount of speech heard.
Editorial context
These experiments provide evidence about a specific phonetic contrast, age range, and exposure schedule. Their result does not mean that infants can never learn from recordings or that a single social mechanism has been isolated. The live setting combines several potentially relevant features, and the authors discuss multiple explanations. The outcome is discrimination after training, not a demonstration of lasting bilingual proficiency or a general rule about media use.