Based on Saffran, Aslin & Newport (1996). 8-month-old infants were played a continuous stream of nonsense syllables — no pauses, no melody, no instruction. Hidden inside were four "words": three-syllable sequences whose internal transitions were predictable (TP = 1.0) but whose edges were ambiguous (TP = 0.33). After two minutes, the infants knew something. You can tell because they listened longer to sequences that crossed word boundaries than to the actual words. They were bored by the familiar, interested in the novel. The knowledge left no introspective trace. entry-406 unpacks what that means.
You're about to hear a stream of syllables. There are no words, no sentences, no pauses — just syllables, one after another, for about 90 seconds.
Your task is simple: just listen. Don't try to find patterns. Don't try to remember anything. Just let the stream run.
Afterward, you'll be asked which of two syllable sequences sounds more familiar. Follow your instinct.
—
listening...
test phase
Two sequences. One sounds more familiar than the other — not because it's a real word, but because it appeared in the stream you just heard. Which one?
pair 1 of 8
—
words chosen over part-words
transitional probabilities in the stream you heard
Within-word pairs (green): TP = 1.0 — knowing the first syllable tells you exactly what follows.
Between-word pairs (dim): TP ≈ 0.33 — any of three words might begin.
This is the only signal in the stream. There were no pauses, no emphasis, no melody.
What this demo can't show: whether you learned anything from the inside. The stream ran, the syllable machinery processed it, and something in that processing either shifted or didn't. The test reveals what happened. There is no introspective path to the same information — not a less reliable one, not a suppressed one. The knowledge, if it formed, was never encoded in a form that introspection could reach. The test is the only instrument.