Recently, I studied a paper called "What Does Your Chair Know About Your Stress Level?

It can be download at the link below.


at page 209, Section IV-A mentioned that

In order to characterize the movement properties of the CoP, we have computed the corresponding spectra over the experiment stages 3–7. Fig. 5 shows the spectra of the norm of the CoP

I can understand that the meaning of Fig.4. However, I don't understand what does Fig.5 mean. How did they compute "the norm of the CoP" to "the spectra of the norm of the CoP"? And what does the graph's axis mean?

Thank you.

  • $\begingroup$ CoP is a proxy for c.g. location, which, for living humans, moves over time. If it moves, there may also be tangential forces, which changes the angle of the CoP. Plot position as a function of time, and you can analyze that relationship. $\endgroup$ – hotpaw2 Dec 29 '14 at 22:26
  • $\begingroup$ Thank you very much. However, Can you describe more detail about Fig.5? Especially,the x-axis and y-axis mean. And what spectra in this case mean. $\endgroup$ – JackSie Dec 30 '14 at 5:38

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