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From: Tom Weidig
Date: 14 Oct 2011
Time: 10:04:12 -0500
Remote Name: 213.135.243.33
What do you mean by environment? It seems like you imply social environment like "cultural influence" or "parents" or "education". However, as far as I understand non-genetic influences split into two types of environmental influences: unique ones and shared ones with a sibling or twin. Unique ones are often illnesses, trauma from accident, accidents, stress, or developmental issues. So it might be useful if you clarify. As far as I understand unique environmental influences play a significant role, but so far no evidence of shared ones. WARNING: this is for whether a child stutters or not. But the severity might well be much more linked to its social environment. Let's see what the geneticist says...