Figure 6. Cubic curves of
spectral embedding.
The embedded path graph was fitted by the cubic function in the form of
. (A - E) Coefficients
,
,
,
and
were compared between the two blocks and within each block. There are significant differences between valenced pictures and arousal pictures for the coefficients
,
,
and
, where coefficients
and
were different in graded arousal levels, indicating a non-linear effect of arousal. (F) The embedded curves in each affective level of valence and arousal. Star marks significant differences (one star: p<0.01; two stars: p<0.01 and three stars: p<0.001; by ANOVA test). Here
,
and
denote the 2nd, 3rd and 4th eigenvector, respectively.