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In the present study, amenity effect of ornamental foliage plants on human psychology was analyzed by means of brain waves and semantic differential technique. The experiments were carried out in a room in Ehime University in January and February of 1997. Four objects with or without ornamental foliage plants in the room were rated by ten students (six males and four females). Brain waves of each student were measured in the room. Ratio of alpha wave to beta wave was calculated as an index expressing the degree of amenity. As for semantic differential technique, factor analysis was performed based on twenty-three SD scales.Higher ratio of alpha wave to beta wave was observed in the objects with ornamental foliage plants, indicating the amenity effect of ornamental foliage plants on human psychology. Two factors were extracted by the factor analysis. The objects with ornamental foliage plants were evaluated higher in the first factor than the objects without plants. As for the arrangement of ornamental foliage plants, the object with ornamental foliage plants placed on a straight line along the window was evaluated higher in the second factor than the object with plants interspersed in the room.

Analysis of Amenity Effect of Ornamental Foliage Plants on Human Psychology by Means of Brain Waves and Semantic Differential Technique.