I think you may mean (and if this is the case I generally agree) that when hormones trigger behaviors such as road rage, those behaviors have already been learned. Likewise, testosterone is unlikely to cause someone to shoot another driver because significant inhibitions against that behavior have been learned.
But hormones have an effect even in early childhood and before birth, when no behaviors have been learned yet. Prenatal hormones affect brain structure, and studies have found a link between hormones in children as young as 3 months and their choice of toys.[1]
I think you may mean (and if this is the case I generally agree) that when hormones trigger behaviors such as road rage, those behaviors have already been learned. Likewise, testosterone is unlikely to cause someone to shoot another driver because significant inhibitions against that behavior have been learned.
But hormones have an effect even in early childhood and before birth, when no behaviors have been learned yet. Prenatal hormones affect brain structure, and studies have found a link between hormones in children as young as 3 months and their choice of toys.[1]
[1] http://www.livescience.com/22677-girls-dolls-boys-toy-trucks...