Fatigue Is a Brain-Derived Emotion that Regulates to Ensure Protection (2012)
&#x27;Protection&#x27; might be the goal of physical fatigue, but it doesn&#x27;t work for intellectual effort - what are you being &#x27;protected from breaking&#x27; by not being able to write another line of code? Carpal tunnel? In that case, it looks more like it&#x27;s about conserving energy or rotating to another task after having spent so much time on one task: &quot;A Meta-Analysis of Blood Glucose Effects on Human Decision Making&quot; <a href="http:&#x2F;&#x2F;www.gwern.net&#x2F;docs&#x2F;2016-orquin.pdf" rel="nofollow">http:&#x2F;&#x2F;www.gwern.net&#x2F;docs&#x2F;2016-orquin.pdf</a> , Orquin &amp; Kurzban 2016
&quot;An opportunity cost model of subjective effort and task performance&quot; <a href="https:&#x2F;&#x2F;www.ncbi.nlm.nih.gov&#x2F;pmc&#x2F;articles&#x2F;PMC3856320&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.ncbi.nlm.nih.gov&#x2F;pmc&#x2F;articles&#x2F;PMC3856320&#x2F;</a> , Kurzban et al 2013