Abstract
We made a laboratory experiment to clarify the difference in psychological effects on participants between a small plant and a large plant in workplace. The participants performed tasks and completed questionnaires about mood, evaluation of task performance, and the impression evaluation of the workplace. Results suggested that both small and large plants reduced the stress during early part of the work and the fatigue and improved the feeling of relaxation. In addition, the small plant might improve the arousal level. It was shown that the small plant also improved the workroom impression. These results suggested a small plant also was effective to improve the workspace circumstances like the large plant.
