gical momentary assessment of activity." width="95%" />
<p class="caption">
Figure 6.1: Actigraphy (left) and Geotracking (right): two methods for passive ecological momentary assessment of activity.
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<div id="actigraphy" class="section level2">
<h2><span class="header-section-number">6.1</span> Actigraphy</h2>
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<p>Accelerometers are micro electro-mechanical systems (MEMS) that measure changes in acceleration forces (i.e., both static forces - earth’s gravity - and dynamic forces - cau