Fluctuating bright light (10,000 lux) and synchronous smell stimulation was given to 18 subjects. They filled in a questionnaire based on the Circumplex Model of Posner et al., 2005 before and after the session registering levels of energy and mood. The results are given in the figure below. 15 minutes of fluctuating light and smell stimulation resulted in an increase in levels of both energy and mood. This type of therapy could be used for treating those with mood disturbances (e.g. anxiety, depression).
The results shown in the graph are the averaged responses (mean +/- standard error, n=18) for "mood" and "energy".