Entropy analysis of heart rate signal during creative thinking

Creativity is an important aspect of cognition. Society developing and dominating the various aspects of the world in the shadow of creativity is possible. The impact of creative activity on the brain has been extensively studied, but autonomic nervous system (ANS) variability has not been considered much during such activities. This paper investigated the chaotic and nonlinear feature of Heart rate variability (HRV), before and during creativity tasks.
The aim of this research is to quantify entropy parameters during creative activity, then comparing it with the rest state and considering it as a creativity index.
Approximation entropy and fuzzy entropy are two measures that were used for characterize the HRV dynamics during different creativity tasks.
comparing the results with the rest state indicated that Mean of entropy values increase similarly with the development of creative activity. In addition, the comparison of each 2 minute segment with the previous segment, shows an increasing pattern at the end of each task. This comparison in task 3 indicates a very incremental changes. Increasing of these entropy values indicates the complexity of HRV during creative thinking.
The research results directly show that there is difference between ANS signal in rest state and different levels of creative activity. Analysis The entropy of HRV could be as a new index for assessment of creativity.