ornet &amp; Holden, <a href="#ref-Cornet2017">2018</a>; Saeb et al., <a href="#ref-Saeb2015">2015</a>; Saunders et al., <a href="#ref-Saunders2016">2016</a>; Tahmasian, Khazaie, Golshani, &amp; Avis, <a href="#ref-Tahmasian2013">2013</a>)</span>.</p>
<p>In this chapter, we will discuss two passive EMA methods to assess physical activity: actigraphy and geotracking. Of these two, actigraphy has been used most in human clinical research. However, due to the massive adoption of smartphones, researchers increas