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152 The APA Publishing Textbook of Mood Disorders, Second Edition
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oblique drawing up of the eyebrows, the puckering of their inner ends, and the for­mation of rectangular furrows on the middle of the forehead” as a species-typical ex­pression of this kind of low mood (Darwin 1872, p. 192).
Clinicians will immediately notice the similarities of the behavioral correlates of protest and despair to signs and symptoms of agitated (protest) and retarded (de spair) depression, respectively. In that attachment styles are “transposed” over the lifespan to important relationships other than the primary caregiver (Bowlby 1969), separation or loss can trigger low mood and depressive responses by activating evo lutionarily and developmentally “primitive” mechanisms that originally evolved as coping strategies for impending or real abandonment. Depression in response to social losses is more likely to occur in individuals who as children were exposed to neglectful or inconsistent parenting and hence developed insecure attachment. Arguably, attach­ment insecurity results in individuals having greater difficulties in eliciting social sup­port, while their mistrustful inner working models promote the subjective experience of social isolation and emotional distance from others (Gilbert 2006), potentially creat ing a vicious circle from which there is no escape without therapeutic support. This interpretation is compatible with ethological work showing that poor maternal care predicts an unfavorable subsequent course of depression (Geerts et al. 2009). Bereave­ment is another typical response associated with low mood in reaction to the loss of an important attachment figure; it is not to be pathologized and mistaken for depres sion (Nesse 2005). Aside from attachment issues, however, mood extremes of depres­sion or mania can emerge from other potential social hazards, such as ones relating to social hierarchy.
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Social Competition
Interpersonal tension is another common source of low mood and depression, whereas ingratiation and dominance are drivers of high mood and mania. In social animals, conflict can arise over any one of the above-described biosocial goals. In­deed, disputes over access to mates, social status, and reciprocal relationships occur in every primate society, including human social groups (de Waal 1989). Succinctly put, competition for mates, resources, and status is so inevitably linked to human so cial life that everybody is exposed to it at some point (Wilson 1998). Accordingly, there are several evolutionary theories about the role of social competition in relation to excessive mood states (Price et al. 1994). These theories differ in nuances—that is, whether the focus is on the chosen strategy to negotiate social hierarchy (escalating vs. deescalating social conflict) (Gardner 1982), the role of defeat (Price 1967), or in voluntary subordination in relation to social rank (Gilbert 1992), which includes the expression of arrested anger (Gilbert et al. 2004), entrapment in situations where sub­mission is ineffective (Gilbert 1992; Price and Wilson 2011), or the reduction of social risk (Allen and Badcock 2003), including the functional role of ruminative thinking (Watson and Andrews 2002). For its part, mania can be seen as an unconstrained ac­quisitive drive (Wilson 1998).
In a now-classic contribution, Price (1967) was the first to highlight similarities in behavior between nonhuman primates negotiating social rank and the signs and symptoms of human depression. He argued that dominant individuals display ag­gression overtly or more subtly to subordinates in response to challenges to, or to sim-
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ply maintain, their social rank. Submissive behavior and defeat, in contrast, are typical behavioral responses by the subordinate to deescalate social conflict (i.e., signal ap peasement) (Price et al. 2007). Changes in rank usually cause elation when climbing up the social ladder, or depression when slipping (Sloman et al. 2011). The former is an equivalent to (hypo)mania, which can also include challenging behavior (Sloman et al. 2011). The latter is protective because it prevents subordinates from fighting back (although irritable mood may be redirected against “inferior” subjects) (Price 1967). In human depression, as Price and colleagues subsequently argued, not only do individ uals signal social defeat by withdrawing from the social arena, but they also actively deescalate conflict through manifest submission, such as hunched body posture, gaze aversion, and avoidance of movements that could be interpreted as competitive (re viewed in Hagen 2011). In addition, loss of appetite and libido indicate abstention from competition for resources or mates. Internal signals or subjective appraisals of defeat comprise feelings of inferiority, shame or guilt, loss of self-esteem, self-criti cism, and powerlessness, altogether contributing to low mood (Carvalho et al. 2013; Gilbert 2006). This is entirely consistent with ethological work on nonverbal behavior showing that depressed individuals avoid eye-to-eye contact, manifest reduced facial expressivity and speech production, and frequently make use of species-specific child behaviors (traditionally labeled “regression”), thus reducing the risk of being attacked (Geerts and Brüne 2009). Conversely, mania is associated with the activation of evo­lutionarily ancient systems involved in the regulation of arousal and ambition (Wil­son 1998).
In an extension to the social rank theory of depression, Gilbert et al. (2002) have pointed out that in situations in which signaling defeat is ineffective, social support is lacking, or control over social resources is poor, feelings of entrapment and arrested anger may occur, and are associated with persistent high arousal. In such circum­stances, feelings of inferiority necessitate holding upward aggression against domi­nant individuals in check (Carvalho et al. 2013). Behaviorally, conflicting motivation involving fight-or-flight responses is expressed through so-called displacement activ ities, such as self-grooming, locomotor activity, or “nervousness,” any of which may present in what is clinically called “agitated depression” (Troisi 2002). As Gilbert and Allan (1998) have noted, subjective feelings of entrapment can be amplified by inter­nal processes such as intrusive thoughts and ruminations. For example, continuous rumination about one’s inferiority may enhance perceptions that there is no escape from the situation, which may ultimately lead to suicidal ideation or actions. In con­trast, Andrews and Thomson (2009) ascribe to rumination associated with low mood a functional role, which helps direct one’s attention away from distracting and unat­tainable goals and reallocate energy to solving problems entailed in the precipitation of the current situation (Durisko et al. 2015).
The social competition hypothesis is in full accord with the broader concept of low mood and depression as a risk-averse strategy for co pin g wit h social thre at ( Alle n an d Badcock 2003). This version of the same theme emphasizes that whereas people with a functional social network can engage in some risk-taking activities, individuals with less supportive social relationships are reluctant to take social risks. Thus, this view emphasizes the role of social adversity in depression, implying that subjects who are risk a verse are also more vigilant toward social threats and avoidance of their own failure.
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In essence, the multiple versions of the social competition hypothesis are by no means mutually exclusive. Moreover, the attachment perspective and the social com petition approach converge on findings that the association between insecure attach­ment and depression is mediated by one’s perceived social rank, which is not the case for individuals with secure attachment patterns, even though the picture is less clear for people with bipolar disorder (Gilbert et al. 2007). On the other hand, Keller and Nesse (2005) noted some interesting differences in symptomatology between de­pressed subjects who experienced loss and depressed subjects who failed to achieve important biosocial goals. Indeed, the former more often display crying and sadness (akin to Bowlby’s [1969] protest-despair stages following loss or abandonment), whereas the latter more frequently experience subjective feelings of pessimism and fa­tigue. Low mood in response to social losses or thwarted biosocial goals can serve as an honest signal to elicit help from one’s social environment, but also can express a (nonconscious) dishonest strategy of extracting “unearned” resources from others, es­pecially when disguised as “learned helplessness” (Watson and Andrews 2002). This interpretation is consistent with ethological research analyzing nonverbal behavior of depressed patients and their interlocutors during clinical interviews, in which high levels of nonverbal support-seeking on the part of the depressed patient and high lev els of received nonverbal support from the interviewer were found to be associated with an unfavorable prognosis. Indeed, Segrin (2000) found that even mild symptoms of depression can induce rejection responses in other people, particularly if the depres­sive symptomatology persists over extended periods of time. Thus, ethological per­spectives on depression suggest that depression can also be the consequence of mal­functioning interpersonal processes, rather than a strategy to ameliorate interpersonal social stress (Geerts and Brüne 2009). It is something of a paradox that members of an altruistic and empathic species like ours sometimes reject those who need help.
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Sickness Behavior, the Immune System, and Depression
Natural selection has endowed all living creatures with defense mechanisms against pathogenic agents. Higher vertebrates possess an innate and adaptive immune sys tem that activates when the body is attacked by viruses, bacteria, fungi, or prions. Proinflammatory states are associated with a behavioral response, known as “sick ness behavior.” Sickness behavior is characterized by lethargy, fatigue, loss of appe­tite, psychomotor retardation, and social withdrawal. This evolutionarily conserved defense reaction to infection is adaptive, because it helps the organism recuperate by saving energy and by reducing the risk of being attacked in times of enhanced vul­nerability (Eisenberger et al. 2017; Raison and Miller 2017). In fact, in gregarious spe­cies, sick individuals not only are at risk of predation but also are susceptible to de­cline in social rank, and to suffering a reduction in reproductive success, as their sex­ual attractiveness decreases (Schaller 2011). Thus, sickness behavior is also associated with heightened vigilance toward social threats (Eisenberger et al. 2017). In addition, kin selection theory (Hamilton 1964) suggests that social withdrawal may reduce the risk of infection for genetically related individuals, even though the costly side of so­cial avoidance may be the loss of provisionary care (Schaller 2011). Interestingly, ani­mals, including humans, are well able to recognize even subtle signs of sickness in others, which activates an immune response in the observer, and often fosters rejec-
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tion and avoidance of the sick individual (Schaller 2011). In humans, however, sick­ness behavior is usually associated with approaching close others and avoiding contact with strangers (Eisenberger et al. 2017).
Because sickness behavior is associated with low mood and anhedonia, depression
can be seen as an evolved state of “pathogen defense readiness” (Raison and Miller
2017). Aside from the behavioral similarities between sickness behavior and depres sion, abundant evidence from immunological research supports the idea that depres­sion can be associated with a proinflammatory state (Dantzer and Kelley 2007; see also Chapter 7, “Role of the Immune System in Mood Disorders,” precipitating conditions of low mood and depression, including parental separation, loss, childhood trauma, intense social competition, loneliness, or social disconnected ness, are accompanied by increased immune activation. In other words, evolved envi­ronmental contingencies identified as potentially dangerous for survival and repro­duction—for example, loss of important attachment figures or thwarted biosocial goals—cause the organism to take preparatory action by activating the immune sys tem. Notably, in terms of causality, proinflammatory states, such as ones induced by the experimental application of lipopolysaccharide, a bacterial agent that triggers an inflammatory response, induce not only low mood and anhedonia but also feelings of social disconnectedness, loneliness, and desire for closeness to familiar others, as well as greater vigilance toward social threat (Eisenberger et al. 2017).
Together, the evidence strongly suggests that evolution by natural selection has produced powerful mechanisms that protect organisms against a broad variety of threats, including infectious and social ones. Immunological response patterns seem to be designed in ways that bodies do not discriminate between different causes of threats, but instead uniformly react with proinflammatory states. With regard to de pression, it has been debated as to whether the increase in prevalence, particularly in urban areas of developed countries, could be related to alterations of the immune sys tem caused by a diminished exposure to pathogens early in life. According to the “old friends” hypothesis, exposure to some pathogenic agents early in life is necessary for normal development of immunoregulation. In the absence of the acquisition of normal immunocompetence, a person’s risk for chronic proinflammatory states increases, as well as risk for autoimmune disease. Due to space limitations, this perspective on epi demiological aspects of depression cannot be dealt with in greater detail here (for fur­ther discussion, see Rook and Lowry 2009, as well as Chapter 7 in this text). It is noteworthy, however, that recent research indicates that the picture is even more com­plex, with both elevated pro- and anti-inflammatory markers in treatment-naïve pa­tients with major depressive disorder (Syed et al. 2018). Interestingly, lack of response to treatment was associated with a pervasive upregulation of proinflammatory cyto­kines, suggesting that a downregulation of defense mechanisms at both somatic and psychological levels is vital for the improvement of depressed mood states.
in this text). In addition,
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Evolutionary Genetics, Depression, and Mania
Excessive mood states of depression and mania are so common across the globe that it is implausible to assume that genes associated with the condition are wholly disad­vantageous in terms of survival and reproduction, or even selectively neutral. The
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crucial question is why genes conferring risk for depression and mania have been preserved in the human gene pool (Wilson 1998). A meta-analysis in about 250,000 in dividuals with depression and 560,000 control subjects revealed 102 independently segregating genes and another 269 genes associated with depression (Howard et al.
2019); however, even though the analysis indicated some interesting inverse correla tions of depression with age of menarche and menopause, it failed to examine poten­tial evolutionary implications of these findings. As with many other genetic studies, the basic misconception is that genes associated with disorder are maladaptive (Wil son 1998). The prevailing view on gene-environment interaction concerning psycho­pathological conditions (also known as the “diathesis-stress model,” per Monroe and Simons 1991) suggests that individuals carrying certain genetic variants who are ex posed to negative life events are vulnerable to developing clinically relevant signs and symptoms. In contrast, individuals not possessing the “risk allele” are genetically protected or resilient (Feder et al. 2009). For example, the short (S) allele of the sero­tonin transporter gene predisposes to depression if accompanied by stressful life events (Caspi et al. 2003); however, variation at the corticotropin-releasing hormone receptor may prevent depression even in the presence of childhood maltreatment (Polanczyk et al. 2009).
A pervasive theoretical problem associated with the diathesis-stress model con­cerns the observation that many of the supposed “vulnerability genes” have under­gone positive selection in human evolution. It is simply implausible to assume that natural selection has favored the preservation of alleles in the human gene pool that increase vulnerability to adversity, particularly when considering that the environ­ment of evolutionary adaptedness was probably fraught with negative life events occurring throughout the entire life span. Instead, positive selection of such alleles strongly suggests that these genes exert hitherto undetected or overlooked beneficial effects on reproductive fitness (which is not the same as being “good for health”) (El­lis et al. 2011). For example, the S allele of the serotonin transporter gene predisposes to depression if associated with adverse life events, but it is also linked to cognitive performance and social conformity, which may compensate for its disadvantageous effect on mood in a “balanced polymorphism” fashion (Homberg and Lesch 2011). Along similar lines, there is evidence to suggest that genes predisposing to depres sion and mania may play an important role in immune function, potentially being in­volved in the defense against pathogens that were more prevalent in our evolutionary past (Raison and Miller 2017). Such a proposition would be compatible with seasonal peaks of depression during winter and spring, when exposure to pathogens is high (Anders et al. 2013).
In addition, a given genetic variation that predisposes to psychopathology if associ­ated with adverse life events can have beneficial effects when environmental contin­gencies are developmentally more supportive; this variability is known as “differential susceptibility” or “phenotypic plasticity.” Put another way, the idea that genes confer responsivity to both positive and negative conditions can explain why they persist in human gene pools (Boyce and Ellis 2005). Consistent with this conceptualization, the S allele of the serotonin transporter gene confers a lower risk for depression in indi­viduals who grow up in favorable early environments (Taylor et al. 2006).
In any event, because the search for so-called risk alleles for psychopathological conditions has been criticized for methodological reasons, and especially because the
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role of the serotonin transporter gene in depression has come under attack, with meta-analyses both in favor of and against its involvement (e.g., Clarke et al. 2010; Culverhouse et al. 2018), we need to emphasize that the heritability of mood disor ders is polygenic, with individual candidate genes contributing only small effects to the phenotypic expression (Howard et al. 2019). It may nevertheless be fruitful to re­frame research into the relevance of gene-environment interaction for mood disor ders in a broader Darwinian perspective.
Conclusion
In this chapter, we set out to explore the evolutionary or “ultimate” dimensions of mood and mood disorders, while leaving aside the “proximate” factors, including the neurophysiological and endocrinological foundations of mood disorders, which are discussed in other chapters of this text (see Chapter 5, “Neurochemistry of Mood Dis­orders”; and Chapter 6, “Psychoneuroendocrinology of Mood Disorders”). We also skipped the increasing evidence for a role of epigenetic changes in mood disorders (see
Chapter 13, “Epigenetics of Mood Disorders”) and shed only a sketchy light on immunological and genetic aspects of mood disorders (see mune System in Mood Disorders”; and Chapter 12, “Genetics of Mood Disorders” well as the impact of coevolutionary processes of the human microbiota on brain func tion (Cryan and Dinan 2012). Instead, we have focused on the role of low mood as a defense mechanism against abandonment and social threats, and on its protective role for organisms in times of increased vulnerability, in contrast to high mood, which is a mechanism for resource and/or social attainment.
At a general level, symptoms associated with clinical depression such as avolition and anergia can be understood as imbalances between active and passive responses to threat (LeDoux and Daw 2018). However, it is a common misconception to believe that positive mood states are superior to low mood states simply because the latter are associated with potentially disadvantageous situations and subjectively bad feelings. Even suicidal behavior may be interpreted, under specific circumstances, as biologi­cally advantageous (in the evolutionary sense). For example, “perceived burdensome­ness” toward kin may undermine self-preservation motives, such that sacrificing one’s own life may eventually foster survival of one’s genes (Joiner et al. 2002). From an evolutionary point of view, killing oneself is, however, such a tremendously costly behavior (aside from being a personal tragedy, of course) that eusocial motives or en­trapment can certainly not fully account for such a multifaceted phenomenon that is putatively human specific (even though self-sacrificial behavior is widespread in euso­cial animals) (Chiurliza et al. 2018). Although an evolutionary analysis of suicidality is beyond the scope of this chapter, we assert that severe clinical depression does not serve adaptive purposes. However, the boundaries between adaptive low or high mood and maladaptive depression or mania may wax and wane with individual eco­logical contingencies and have likely become more prominent as the modern environ­ment differs from the environment of evolutionary adaptedness, and hence are difficult to determine (Wilson 1998). Recent calculations suggest that the global prev­alence of unipolar depression is about 8 times that of bipolar disorder, 14 times that of schizophrenia, and 34 times that of autism spectrum disorder, and therefore is too
Chapter 7, “Role of the Im
), as
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frequent to conclude that it is always associated with biological malfunction. More­over, mood disorders may be the only major psychiatric condition to be associated with increased biological fitness (i.e., fecundity), especially in women (Durisko et al.
2015). This idea is consistent with evolutionary explanations for sex differences in prevalence of depression as well as hypersexuality in mania. Women are twice as vul­nerable to developing depression as men, which could relate to the biological fact that they invest much more in offspring and thus are more dependent on support from their mates and close kin (Troisi 2001). Therefore, the risk of losing important social connections when engaging in conflict-escalating strategies may be more relevant for women than men, even though this is not reflected in differences in the prevalence of bipolar disorder. In contrast, the preservation of genes predisposing to (hypo)mania may, in part, relate to the enhanced creativity, charisma, and leadership found in first­degree relatives of patients with bipolar disorder, all of which likely serve as proxies for reproductive success (Wilson 1998).
Understanding mood and mood disorders in an evolutionary perspective can also be informative with regard to therapy. One conclusion could be that it might not al ways be useful to suppress low mood, just as it is not always helpful to block cough, fever, or pain. Instead, it might be more appropriate to analyze individual needs in terms of mood regulation systems, including motivation, affiliation, and safeness, as conceptualized in compassion-focused therapy (Gilbert 2014).
Evolutionary accounts of psychopathology, including this abbreviated consider­ation of mood and mood disorders, have limitations and certainly many critics. Nev­ertheless, because nothing in biology really makes sense except from an evolutionary perspective, additional research on the evolved bases of mood and its disorders will surely make further and significant contributions (Dobzhansky 1973).
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