Research by Washington State University (1996) investigated the impact of the addition of indoor plants to a college computer lab environment.
In total, 96 participants (range 18 to 46 years old) had their blood pressure and emotional well-being assessed. These tests were undertaken either in the presence or absence of plants and also whilst undertaking a timed computer task.
Each participant was assessed pre-task using a questionnaire together with blood pressure and pulse readings. Further blood pressure and pulse readings were taken during the computer task and also post-task together with a final assessment questionnaire.
The findings from statistical analysis indicate, that when plants were added to the interior space, participants’ responses were found to be:
- More productive (12% quicker reaction time on the computer task)
- Less stressed (systolic blood pressure readings lowered by one to four units)
Furthermore, they reported greater attentiveness (+0.5 increase on scale) compared to those colleagues who were not exposed to plants.