Interactions include words, yes. But they are more than just words.
In 1995, researchers Betty Hart and Todd Risely presented their groundbreaking discovery of the “30 Million Word Gap”. In short, by recording the number of words a child heard throughout the day, they found a substantial gap between the words children heard in families from different socioeconomic backgrounds. The fascinating claim was that it was this gap in words – more than the gap in economics – that was responsible for the achievement gap between these SES families.