**Anxiety, Worry and Fear: Quantifying the Mind Using EKG Time Series Analysis EKG Time Series Analysis**

**Anxiety, Worry and Fear: Quantifying the Mind Using** 

DOI: 10.5772/intechopen.71041

#### Toru Yazawa Additional information is available at the end of the chapter

Toru Yazawa

Additional information is available at the end of the chapter

http://dx.doi.org/10.5772/intechopen.71041

### **Abstract**

We analyse the heartbeat interval time series in this chapter. Our time series analysis concepts and techniques have been reported previously, for example, in the Intech Book chapter. Here, we would like to introduce how it works by presenting typical examples. The techniques can distinguish between healthy, sick and stressful hearts. All data were obtained by us from natural heartbeat data. Therefore, we have notes behind data, especially about behavioural psychological observations. Results of analysis are the following: healthy hearts exhibit a healthy scaling exponent (SI), which is near 1.0, stressful hearts exhibit a lower SI, such as 0.7, dying heart's SI approaches to 0.5, and so forth.

**Keywords:** cardiovascular system, EKG, electrocardiogram, heartbeat-interval time series, modified detrended fluctuation analysis, mDFA, scaling exponent
