Gijs van Houweling got his PhD last week, and writes his thesis 'Something to rely on: the influence of stable and fleeting drivers on moral behavior'. This article in the Volkskrant elaborates on his thesis and states that abstract thinking is essential for making moral choices.
The article is also published here:
www.accountant.nl/Accountant/Nieuws/Moreel+gedrag+hangt+af+van+abstractievermogen.aspx