They collaborated on the founding of a new holistic attitude toward psychology called Gestalt theory ( from the German word for `` whole '' ) , aspects of which are indebted to the earlier work of Stumpf ( Köhler 's teacher ) and Christian von Ehrenfels ( whose lectures at the University of Prague Wertheimer had attended ) .
They collaborated on the founding of a new holistic attitude toward psychology called Gestalt theory , from the German word for `` whole '' .