抄録
The present research is related to prototype images carried by people. Usually, with regard to a given concept, people associate groups of real objects which are included in the concept. A prototype image can be regarded as an abstract average value of these objects. In the present research, we investigated how looking at a shape whose aspect ratio has been altered can change the prototype image of that shape. The results indicated that if an altered image is presented to a person for a prolonged time, the prototype image eventually changes. In addition, it was found that this change correlates with a power function.