This study is to specify cognitive prototypes of bridges of bridge engineers using a proposed methodology based on “a Cognitive Model of a Sense of Dynamism of a Structure’s Form” which one of the authors proposed. The methodology consists of an optical psychological experiment, which was reorganaized from the previous study, and analyses with logical charts, which shows relations between obtained responses and a method to be applyed. The authors carried out psychological experiments on twenty-nine bridge engineers, who were chosen as subfects because they were supposed to have some cognitive prototypes of bridges. As a result, the authors specified several different types of prototypes for arch-type bridges.
