The present study extends the growing behavioral literature on indices of happiness for persons with developmental disabilities to the geriatric population. Data on indices of emotional affect (i.e., happiness) were collected prior to, during, and after each resident was exposed to environmental enhancement activities of various durations. Results showed that every activity improved each resident's level of happiness when compared to pre- and post-activity levels. These outcomes suggest that indexing affect may be as useful for nursing home residents as it has been for individuals with developmental disabilities. (Contains 1 figure.)