study summary / 010

Can a living wall influence responses to a demanding task?

A small experiment finds a cardiac difference during a task, without a significant cognitive benefit.

A planted wall can change an indoor scene. Serra and colleagues compared its effects with an object-filled shelving unit in real and virtual settings.

The study

41 healthy adults took part: 21 in a real room and 20 in virtual reality. They experienced both conditions on separate days in counterbalanced order and completed a backward digit-span task. Physiological analyses included 37 participants after missing data.

The findings

During the task, the living wall was associated with a higher percentage of high-frequency heart-rate variability, a measure related to parasympathetic activity. The resting comparison and cognitive performance showed no significant benefit. Positive-emotion ratings were higher with the living wall only in the real setting.

Architectural interpretation

The result invites further study of planting during demanding activities. A physiological difference should not be presented as evidence that living walls improve memory or productivity.

Limits and conclusion

The sample was small, real and virtual conditions used different groups, and some physiological data were missing. The study lacked an empty-room control and baseline emotion measures. Broader claims about stress relief or workplace performance need further evidence.