I grew up with Hindi and English, learned Spanish in school and now am teaching myself German. It seems that I can switch easily between Hindi and English, but

I grew up with Hindi and English, learned Spanish in school and now am teaching myself German. It seems that I can switch easily between Hindi and English, but while I am learning German and try to speak Spanish, I confuse Spanish words for German ones. I am not sure of the neurology that is going on here, but I am sure that it is the process of building these neural connections to new languages is what keeps your brain active and perhaps conditions your brain to make new connections elsewhere as well. Just a guess.