Although it is clear that implicit and explicit attitudes are not same, how do they differ is not. I believe establishing the relation between them would surely help deducting it's meaning in context of psychology. It seems that research  by Nosek (2007) would be relevant.Nosek, B. A. (2007). Implicitexplicit relations. Current Directions in Psychological Science, 16(2), 65-69.
What is the difference between implicit and explicit attitudes?
cognitive psychology;social psychology