His work seems closely related to the concept of 'locus of control', a pretty well-studied area of psychology. People with an internal locus of control tend to

His work seems closely related to the concept of 'locus of control', a pretty well-studied area of psychology. People with an internal locus of control tend to be healther/more successful than those with an external locus of control. Wiki page: http://en.wikipedia.org/wiki/Locus_of_control http://en.wikipedia.org/wiki/Locus_of_control