Figure 4
![Figure 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40101-015-0060-8/MediaObjects/40101_2015_60_Fig4_HTML.gif)
Comparison of average log[LF/(LF + HF)] and logHF of HRV during the last 3 min of plant and computer tasks. N = 24, mean ± SE, *P < 0.05 (paired t test). HF: high-frequency component, LF: low-frequency component.
Comparison of average log[LF/(LF + HF)] and logHF of HRV during the last 3 min of plant and computer tasks. N = 24, mean ± SE, *P < 0.05 (paired t test). HF: high-frequency component, LF: low-frequency component.