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They’re far more likely to pay attention to us when we use this “caregiver speech,” research has shown.

Each button on the left side of the window represents a different aspect of caregiver speech that can be compared with how quickly the child learned each new word.

By creating new technology for fast and accurate speech transcription and audio analysis, Roy’s team has transcribed approximately 60 percent of the recorded speech that occurred during the 9 to 24 month period of the child’s life, a period beginning when the child was just starting to respond to caregiver speech, and ending after the child had learned well over 500 words.