Only in US there's this strange obsession with counting how many languages one knows. If I count, everyone in my family is at least bilingual, and most are >= t

Only in US there's this strange obsession with counting how many languages one knows. If I count, everyone in my family is at least bilingual, and most are >= trilingual. It's not unusual for someone to speak 4 languages (2 regional languages, nationally common language, english). If you really want to look into effects on cognition, it's better to count language families rather than individual languages. Two dravidian languages might be so similar (one to one mapping of linguistic concepts) that cognitively it might not change anything. In india, the poorest people often speak the most number of languages and their cognition is affected by a number of other factors related to poverty. I'm not sure how one can properly control for such factors.