**6. Case study 2: overseas flight**

A volunteer (a male aged 66) travelled by air from the Narita-Tokyo Airport to the Washington Dulles International Airport in order to attend a conference held in the USA. Using the iPod device, we recorded his EKGs and computed the scaling exponents as shown in **Figure 15**. Twenty-four SI measurements during the flight were documented and plotted, from which we found that mDFA accomplished understandable results similar to that shown in **Figure 13**.

We confirmed that the SI values can represent the internal world of the subject (see **Figure 15**). For example, when the subject was at an aroused state such as in the waiting lounge (see 1 in **Figure 15**), watching an exciting documentary (note: highly personalised expression), and preparing for landing (see 24 in **Figure 15**), the SI is near 1.0. In turn, when watching a movie which has an emotional involvement (note: highly personalised expression), the heartbeat of subject shows a lower SI values (see 18–20 in **Figure 15**). Finally, when the subject is at asleep condition, the SI decreases significantly (see 7–9 in **Figure 15**).

In conclusion, a happy life could fundamentally guarantee a healthy exponent. Anxiety and stress lowered the scaling exponent. mDFA might reflect psychological and physical internal bodily state. mDFA might look at the internal state through the heart. The heart is the window of the mind.
