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==Definition==
The definition of perseverative cognition is: "the repeated or chronic activation of the cognitive representation of one or more psychological stressors".<ref name="BGT2006"/><ref name = "VBGT2010">{{cite journal | last1 = Verkuil | first1 = B. | last2 = Brosschot | first2 = J.F. | last3 = Gebhardt | first3 = W.A. | last4 = Thayer | first4 = J.F. | year = 2010 | title = When worries make you sick: A review of perseverative cognition, the default stress response and somatic health | journal = Journal of Experimental Psychopathology | volume = 1 | pages = 87–118 | doi = 10.5127/jep.009110 | doi-access = free }}</ref> [[Worry]], [[rumination (psychology)|rumination]] and all other forms of thoughts ([[cognition]]), about stressful events that have happened or might happen, fall under the definition of perseverative cognition. 'Just thinking about your problems, without calling it worrying or rumination', is also perseverative cognition, as is [[mind wandering]] when it concerns negative topics.<ref name="OSC2013"/><ref name="OC2013"/> There is a large body of knowledge about the typical constituents of perseverative cognition, such as worry, rumination, repetitive thinking and (negative) mind wandering (reviewed in Watkins, 2008<ref name="W2008"/>).
Perseverative cognition may partly be [[Unconsciousness|unconscious]].<ref name="B2010">{{cite journal | last1 = Brosschot | first1 = J.F. | year = 2010 | title = Markers of chronic stress: Prolonged physiological activation and (un)conscious perseverative cognition | url = https://www.semanticscholar.org/paper/b78516fb305d378d1793b158a5bc96666239febd| journal = Neuroscience and Biobehavioral Reviews | volume = 35 | issue = 1| pages = 46–50 | doi = 10.1016/j.neubiorev.2010.01.004 | pmid = 20096302 | s2cid = 38978073 }}</ref><ref name="BVT2010">{{cite journal | last1 = Brosschot | first1 = J.F. | last2 = Verkuil | first2 = B. | last3 = Thayer | first3 = J.F. | year = 2010 | title = Conscious and unconscious perseverative cognition: Is a large part of prolonged physiological activity due to unconscious stress? | journal = Journal of Psychosomatic Research | volume = 69 | issue = 4| pages = 407–16 | doi = 10.1016/j.jpsychores.2010.02.002 | pmid = 20846542 }}</ref> Just as people are not aware of the larger part of their thoughts (cognition),<ref name="BM2008">{{cite journal | last1 = Bargh | first1 = J.A. | last2 = Morsella | first2 = E. | year = 2008 | title = The unconscious mind | journal = Perspectives on Psychological Science | volume = 3 | issue = 1| pages = 73–9 | doi = 10.1111/j.1745-6916.2008.00064.x | pmid=18584056 | pmc=2440575}}</ref><ref name="DN2006">{{cite journal | last1 = Dijksterhuis | first1 = A. | last2 = Nordgren | first2 = L.F. | year = 2006 | title = A theory of unconscious thought | journal = Perspectives on Psychological Science | volume = 1 | issue = 2| pages = 95–109 | doi = 10.1111/j.1745-6916.2006.00007.x | pmid = 26151465 | citeseerx = 10.1.1.513.2448 | s2cid = 7875280 }}</ref> they may also not be aware they continue to think about stressors.
== Perseverative cognition hypothesis ==
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