Social Dominance Theory: Are The Genes Too Tight?

Dana Ward
Pitzer College (Currently on Leave At
Miyazaki International College)

Paper Presented at the Eighteenth Annual Scientific Meeting of the International Society of Political Psychology, Washington D.C., July 4-8, 1995.


Social Dominance Theory:
Are the Genes Too Tight?

Research into the question of gender differences has mushroomed over the past two decades. Like mushrooms found on the forest floor, and like much research into differences between races, some of the research on gender differences has been poisonous. Stereotypy rather than objectivity has too often been the filter through which data has been sifted. Consequently, care must be taken in assessing which data are firmly grounded and which are merely rooted in centuries, if not millennia, of skewed images of masculinity and femininity. In this paper, I will suggest that much of what we take to be differences between males and females is in fact a function of differences between the relatively powerful and the relatively powerless. In brief, the characteristics often attributed to the biology of males and females are in fact adaptations to power structures.1 The Seed The vehicle for this discussion is a series of papers and articles written by Jim Sidanius and various co-authors reporting research into the political psychology of gender. The first is "Sex-Related Differences in Socio-Political Ideology" (1980), written with Bo Ekehammar. The article reports findings from a survey of 532 Swedish high school students in Stockholm concerning political and social attitudes. The article's abstract states: "Despite certain ideological differences between males and females, the socio-political attitude profiles and the attitude structures...were quite similar for males and females." (1980, p. 17.) What attracted the authors' attention, however, were not the similarities, but "certain ideological differences" between boys and girls. These differences between the boys' and girls' socio-political attitudes became the focus of Sidanius's future research into the political psychology of gender and will be the focus of this response. The significance of the findings Sidanius and Ekehammar reported in 1980 lay in the fact that they contradicted received wisdom on the issue of gender and ideology up to that point. Research from the 1950's through the 1970's seemed to show that women were more, not less, conservative "concerning sexual issues, political party choice and general attitude[s]" (p. 17.) Women's greater conservatism was thought to be a function of age, since women live longer, and when age is held constant ideological differences tend to disappear. In the Sidanius and Ekehammar study, however, there was no difference in terms of political party choice but females were less conservative than males in their general political outlook, and "less racist, pro-western, punitive and more religious and egalitarian than males." (1980, p. 17.) In short, Sidanius and Ekehammar identified a set of attitudes about which males and females seemed to differ in a systematic way: "Our results indicate that females do not have more conservative political party preferences but rather tend to have more left-wing political party preferences as compared with men. [although not a statistically significant difference.] Women seem to be less generally conservative, less racist, less punitive and...more egalitarian and tolerant than men." (p. 23.) The differences identified in the last sentence of the above quotation eventually led Sidanius to test the theory that men exhibit greater "group dominance" than women. Plausible Roots Before turning to the articles testing group dominance theory, it is instructive to review the four principal "schools" of thought the authors identified as possible explanations of "the sources of divergent political styles of men and women:" the political socialization school, the situational school, the structural school and the biological school. (1980, p. 18.) 1) The political socialization school holds that observed differences between males and females are a function of early childhood modeling of adult behavior. According to this school, sex-appropriate behavior is rewarded, inappropriate behavior punished, and thus children learn which domains are "male" and which "female", e.g., the kitchen "belongs" to women, politics "belong" to men. Differential levels of political knowledge, participation, and ideology are the result. 2) According to the situational school the lack of political interest, activity and knowledge exhibited by women compared to men is the result of different life experiences. Women are burdened with child care and domestic responsibilities, leaving little time for outside interests such as politics. Men, in contrast, are exposed to socio-political stimuli in their daily routines which arouse more interest in politics, a greater likelihood to participate actively in politics and greater political knowledge. Presumably, as the gendered division of labor breaks down, the observed differences should disappear. 3) The structural school regards the observed differences between men and women as a function of power conflicts. Some conflicts involve men and women on opposite sides of a struggle, other conflicts are merely a function of class struggles with women viewed as sources of cheap labor and uncritical consumers due to lower levels of education among women. 4) Finally, the biological viewpoint holds that the political differences between men and women are biologically determined. Differences in activity for example are explained by different levels of androgens in the blood. Testosterone leads men to be more aggressive and assertive, thus more attracted to political battles where they can joust for power and status. The authors cite the work of Dearden (1974) as exemplary of this model: ..."it is the higher levels of testosterone in men which lead to higher levels of male aggressiveness and assertiveness. The greater aggressiveness and assertiveness of males as compared to females has...direct implications concerning differential levels of political involvement and certain differences in political ideology between men and women." (1980, p. 19.) Pruning Which model, then, did Sidanius and Ekehammar regard as the best platform from which to view their findings that women were less conservative, less racist, less pro-western and less punitive than men, while at the same time being more religious and egalitarian than males? The authors rule out the situational and structural models as being unable to explain the greater racial and social egalitarianism among women. They argue that the data do not contradict the socialization model, but neither do the data confirm the model. Probably because the subjects' educational level was the same, the authors argue, the political socialization model's predicted greater conservatism among women did not manifest itself. The status of the socialization model is left open, but the data do not support the model's predictions. The only model left standing on its own, in the authors' view, is the biological model: "...none of the evidence we have found here is in any way incongruent with the assumptions of the biological model." (1980, p. 25.) The authors point out that the political socialization model is not incompatible with the biological model and that they may well work together, but the only unscathed model is the biological model. The Fruit A decade and a half after identifying these differences Sidanius and several colleagues returned to the issue, this time in the context of social dominance theory. (Pratto, Sidanius, & Stallworth, 1993; Pratto, Sidanius, Stallworth, & Malle, 1993; Sidanius1993a; 1993b; Sidanius, Cling, & Pratto 1991; Sidanius and Pratto 1993; Sidanius, Pratto, Martin & Stallworth 1991.) The two most recent studies (Sidanius, Pratto and Bobo 1994, and Sidanius, Pratto, & Brief, 1994) will serve as the basis for this critique. Sidanius, Pratto and Bobo (1994) analyzed data collected in 1992 from 1,897 randomly selected adults in Los Angeles County. The study sought to test social dominance theory. Sidanius and his colleagues argue that their conception of social dominance orientation (SDO) is "similar to Eisler and Loye's (1983) ranking-versus-linking2 distinction and Rokeach's (1979) concept of equality as a generalized social value. They define SDO as: "The degree to which people: (a) desire to have their own ingroup dominate and be superior to generalized outgroups, and (b) support generalized hierarchical relationships among groups in society" (Sidanius, Pratto & Brief, 1994, p. 5.) and "(c) a view of the world where social groups are engaged in zero-sum conflict over social value." (Sidanius, Pratto & Bobo, p. 1007.) The authors hypothesize that males should have a higher average level of SDO than women after all "cultural, situational, and environmental factors are considered." (Sidanius, Pratto & Bobo, 1994, p.1000) They describe this proposition as the "invariance hypothesis" and present the "weak" and "strong" versions which they test, reporting results in the various articles mentioned. The strong version holds that not only are men more likely than women to express a social dominance orientation, but that the size of the difference in expression should be invariant across cultures. In the weak version, men are still more likely than women to express a social dominance orientation, but there is considerable cross cultural variation in the gap between men's and women's social dominance orientation. Sidanius, Pratto and Bobo (1994) "confirmed the notion that men have significantly higher social dominance scores than women and that these differences were consistent across cultural,3 demographic, and situation factors..." (p. 998.) Of what, then, does that confirmation consist? While it is true that the authors found statistically significant differences between males' and females' SDO scores, the difference could hardly be called "significant" in the more ordinary sense of the term. In the authors own words, "The mean effect size for sex-gender was indeed small (.07)." (1994, p.1009.) Although earlier in the article SDO is linked to war, capitalism and a number of other major political behaviors, all the authors claim in the end is that if this difference is upheld by other research teams, the difference will be important in terms of "helping us to choose among various explanatory paradigms." (p. 1009.) The main thrust of my criticisms in this paper is the way in which this very small difference is interpreted and the way it is linked to very "large" political behaviors. Roots Re-potted In the article's summary, Sidanius and his colleagues return to the question of what kind of model will explain their findings. They again caution the reader that they are really only concerned with the two hypotheses on higher male SDO and the invariance across cultures, but raise the broader issue of what determines SDO merely as an elaborative speculation. In the recent articles, three broad determinants of SDO are considered, including the cultural-deterministic (CD) model, the biological-deterministic (BD) model, and the biocultural interactionism (BCI) model (see Sidanius, Cling, & Pratto, 1991). The CD model attributes the observed gender differences in SDO to social, cultural and other environmental factors. The biological-deterministic model is essentially the same as that articulated in the Sidanius and Ekehammar article in which genetically determined mixes of hormones and the like stimulate particular patterns of behavior. The BCI model is an interaction between culture and biology. The BCI model is now the preferred model to explain SDO. The BCI perspective "suggests that the traditionally assumed dichotomy between 'nature' and 'nurture is nonsensical; instead what are normally regarded as strictly 'cultural' and 'genetic' factors are neither strictly cultural nor genetic." (Sidanius, Pratto, & Bobo, 1994, p. 1000.) In the summary the authors state that CD explanations are "clearly possible (p. 1009.), but indicate their cautious preference for the BCI model. More Fruit Turning now to "Group Dominance and the Political Psychology of Gender: A Cross-Cultural Comparison" (1994), Jim Sidanius, Felicia Pratto and Diana Brief continue the argument that men are more likely than women to express a group dominance orientation. The authors claim that most research on this issue points to support for the strong version and cite studies of racism which show that regardless of ideology or ethnicity, men were consistently more racist than women and by about the same amount. All the studies cited, however, were conducted within a single country, so the authors set out to conduct a cross cultural test of the SDO hypothesis, drawing subjects from Australia, Sweden, the United States, and the former Soviet Union. Although there was no direct SDO measure the authors patched together a set of items that the authors believe "comes very close to embracing the central construct of SD {social dominance} theory." (p. 9.) The items selected were (a) white superiority, (b) racial equality, (c) mixed marriage, (d) increased social equality, and (e) social equality. Together the items create a construct labeled "group dominance orientation" (GDO). The results of the study did not confirm the strong versions of SDO, but did confirm the weak version. That is, men consistently expressed more social dominance than women, but the degree of difference was not constant across the countries sampled. In statistical terms, there was an interaction, albeit small, between gender and nationality. The "strongest interaction effects were associated with American females (M = .12) and Swedish males (M = .11), both of whom were more group-dominance oriented than either their nationality or sex would lead one to expect." (p. 12.) Interestingly, "across all four national samples, males appeared to be more heterogeneous (e.a.) in their GDO scores than females." (p. 13). The authors also found that even though males were more heterogeneous than their co-national females, males did not appear to differ across nationalities, while females were more homogeneous within a particular nation, but more variable across nationality (i.e., men's GDO scores varied across a wider range than the more compactly arrayed female GDO scores, and from country to country, the degree of homogeneity among women's GDO scores changed). These findings on heterogeneity and variable degrees of homogeneity will become important to the critique which follows. The Challenge The authors close their study by noting that "Once social scientists begin to converge upon a theoretically coherent and valid explanation of mean gender differences with respect to characteristics such as xenophobia, outgroup aggression and group dominance, we will probably gain a better understanding of these heterogeneity differences as well." (p. 18.) I shall turn, then, to that project as I evaluate the body of research Sidanius and his colleagues have produced. The main thrust of my critique is that the early version of the BD model is wholly inadequate and unsupported by subsequent research and that the BCI model is only slightly less inadequate. The observed differences between men and women are not nearly as robust and consistent as the authors hold and what differences that do exist are wholly explainable without recourse to genes and hormones. The observed differences are adaptations to power structures and I will suggest that the cause behind the greater heterogeneity in male GDO scores is that men experience a much wider array of power situations within any given country than women, and that the cross national variability among women is accounted for by the relative progress women have made in each country toward equal power sharing with men. Weedings An issue that keeps reappearing in this set of articles is the question of the root determinants of SDO/GDO. The reader is always admonished to remember that the focus should be on the empirical findings, not the theoretical ruminations, but those ruminations generally occupy significant space in the articles. Just as consistently, the authors lean toward biologically oriented explanations of the root cause of higher male SDO. The schools of thought, models and/or theories put forth are usually thumb nail sketches (as is appropriate for journal articles reporting empirical research) so I may be missing some of the subtlety of the authors' biological model in this response, but it seems that the authors are relying more on stereotypes of male-female biological differences than they are on the state of biological research into these issues, as I shall soon demonstrate. Returning to the early study by Sidanius and Ekehammar (1980), the authors' ready embrace of the biological model troubled this reader for several reasons. First, the situational and structural models were ruled out because they could not explain the greater racial and social egalitarianism among women, but by the same token the biological model can not explain women's more religious beliefs,4 yet the model is retained. Second, none of the models were spelled out in any detail, nor specified in such a way as to pit one model against another to determine which explains the data better, so any judgment of the adequacy of models is purely speculative as the authors admitted later in the conclusion: "...it has not been our intention to conduct any formal 'test' of explanatory models." (p. 25) What is troubling is that given the lack of a formal test and the very cursory explication each model receives, the basis for choosing any model can only be the authors' pre-conceived notions of which model is best. These pre-conceived notions are then presented in the article dressed as tentative conclusions. In later articles, the "conclusions" are folded into the "etiology" of social dominance orientations (Sidanius, Pratto & Bobo, 1994, p.999-1000.) Equally troubling is that when the authors introduced the biological model, they linked it to what today we might refer to as male "testosterone poisoning" on the one hand, and female nurturance and tendermindedness on the other. These concepts are so riddled with stereotypes and so poorly sustained by research (see below), that one must keep in mind that the research reported in this article belongs to a previous era of research on gender differences. That is not the case, however with the data Sidanius and his colleagues have collected more recently which are interpreted in a similar manner to the data reported in 1980. The biocultural interaction (BCI) model now preferred by the social dominance theorists is really little more than a combination of the socialization model and the biological model presented in the 1980 article. Biological drives produce behaviors which are then modified by social forces and over the course of evolution humans adapted not only to the physical environment but to the social environment: "genetic encoding and heritability do not merely reflect long-range adaptation to the physical environment (e.g., climate, food supply and microbe environment) but adaptation to the social environment as well." (Sidanius, Pratto & Bobo, 1994, p.1000.) The authors continue, "Therefore, to the extent that male out-group aggression is influenced by genetic encoding, this genetic encoding can also be seen as being partially influenced by 'social norms.'" (p.1000) What the authors seem to mean is because it is in their genes (handed down from our primate ancestors' behavior?), men will go about forming groups attempting to dominate other groups to the degree socially defined norms limit that behavior. In other words, genes cause the behavior, cultures modify the behavior, evolution incorporates the modifications into our genes, and so on in a cycle. Over the course of evolution social forces have limited SDO such that there is now a difference between men and women, but the difference is "small". This version of evolution and the role dominance and biology play in human behavior can not be sustained. Whatever drives we have inherited from our early ancestors, those drives are filtered by our higher neural processes before they are acted upon. What humans, be they men or women, have inherited is a potential to engage in aggressive, violent, dominating behaviors among a wide array of other potential behaviors. There is nothing in our neurophysiology that compels us to perform any particular social behavior. Our behavior is conditioned by processes of learning and socialization. That process is an interaction between the organism and the environment, but the interaction is of a much different kind than that Sidanius and his colleagues have portrayed. There is no gene or set of genes carried by males which cause them to be more social dominance oriented than females. SDO is a cultural artifact, not a biological one. The behavior has been culturally inherited, not biologically determined be it directly or in interaction with an environment. Cultures have selected various combinations of behaviors to reinforce or discourage from a much wider array of potential human behaviors present in any single culture. Re-Tilling Perhaps the most relevant issue for the SDO theory, is the extent to which men are found to be more aggressive than women, for in the early versions it was the higher levels of testosterone that caused men to be more aggressive, more war-like, more politically and socially engaged, and more dominance oriented than women. What then, is the status of research on these issues? Recent research on testosterone clearly invalidates the "testosterone poisoning" theories concerning supposed differential rates with which men and women behave aggressively. Anne Fausto Sterling is only one among many who have deflated the "myth of testosterone--often named as the root cause of war, riots, murder, bar brawls, corporate takeovers, wife beating, clear-cutting, and other forms of 'male' aggression--demonstrating that no credible evidence indicates that testosterone causes aggression. In fact, studies of soldiers preparing for battle in Vietnam suggest that testosterone levels actually drop severely in anticipation of stressful situations." (Dunne, 1994) This June, at the annual meeting of the Endocrine Society, "researchers said that it was a deficiency of testosterone, rather than any excess, that could lead to all the negative behaviors normally associated with the androgen." (New York Times Fax, June 20, 1995, p. 3) While this report leaves open the possibility of a biological model explaining the behaviors, it is a model not driven by testosterone. Furthermore, the production of hormones seems directly linked to particular situations. If this is the kind of interactionism the authors envision, there is no reason to believe men are more driven toward social dominance than women except to the extent men are faced with situations producing differential hormonal levels. Women faced with similar situations would react in similar ways. Over the course of a lifetime responding to different sets of situations, men may well express more SDO than women, but it is a process of learning and socialization, not a pecking order preference among men produced by genes. Given what we know at this point about aggressive behavior, it is unlikely that anything but a learning model will explain the supposed differences between men and women on the expression of aggression and, likewise, SDO. The research on aggression is particularly instructive since aggression is often viewed as a "biologically" driven behavior and a behavior engaged in at different rates by men and women. The most extreme form of group aggression is, of course, war, and support for war is referred to in the various articles by Sidanius and his colleagues as one of the behavioral differences between men and women possibly produced by SDO (Sidanius, Pratto & Bobo, p. 999.) The tendency toward aggressive behavior is also very likely to be directly related to SDO. That is, highly aggressive individuals are also likely to be highly social dominance oriented. What, then, is the status of research on aggression, war, and violence, and in particular what is the evidence of gender differences in these behaviors? Geneticist Anne Fausto Sterling and Biologist Ruth Hubbard are two of the most prominent women researchers skeptical of BD models of gender differences. (Sterling, 1993a, 1993b, Hubbard and Wald, 1993. See also, Campbell, 1993.) Not only does Hubbard's and Sterling's work show that men are not inherently more aggressive than women, it has become quite clear that aggression is not the product of higher testosterone levels in men and is in fact a learned behavior, not a biologically determined behavior. Many social scientists examining aggressive behavior have also found that supposed differences between males and females on the expression of aggression evaporate on closer examination. Men and women have found perhaps different culturally determined ways of expressing aggression, but the rate of expression is quite similar. To give but one provocative example of an important area involving aggressive behavior, the National Crime Victimization Survey, conducted by the U.S. Bureau of Justice Statistics shows that 54 per cent of all "severe" domestic violence is committed by women. (U.S. Bureau of Justice Statistics, 1995.) Perhaps the best review of the issue of aggression and social behavior took place in 1986 when twenty internationally renowned behavioral scientists held a conference in Seville, Spain. The purpose of the conference was to assess that status of research on violence. Their findings are reported in Aggression and War (1989), edited by Jo Groebel and Robert Hinde, and are summarized in the Seville Statement on Violence which has been endorsed by several professional associations including the American Psychology Association and the American Anthropology Association. The Seville Statement merits lengthy quotation since it bears directly on the BCI interpretation Sidanius and his co-authors have argued explains their findings on SDO. "It is Scientifically incorrect to say that we have inherited a tendency to make war from our animal ancestors...The fact that warfare has changed so rapidly over time indicates that it is a product of culture. Its biological connection is primarily through language which makes possible the coordination of groups, the transmission of technology, and the use of tools. "It is scientifically incorrect to say that war or any other violent behavior is genetically programmed into our human nature....While genes are co-involved [along with environments] in establishing our behavioral capacities, they do not themselves specify the outcome. "It is scientifically incorrect to say that in the course of human evolution there has been a selection for aggressive behavior more than for other kinds of behavior. In all well-studied species, status within the group is achieved by the ability to cooperate and to fulfill social functions relevant to the structure of that group...Violence is neither in our evolutionary legacy nor in our genes. "It is scientifically incorrect to say that humans have a 'violent' brain'...How we act is shaped by how we have been conditioned and socialized. There is nothing in our neurophysiology that compels us to react violently." (Groebel & Hinde, 1989.) The main thrust of the findings from the Seville conference is that aggression is a learned behavior. Genes merely provide a wide range of possible behaviors and processes of socialization determine which behaviors will be expressed. In the BCI version of Sidanius and his colleagues, it seems to be the genes which determine greater male SDO regardless of environment. Theirs is a model that sounds similar to, but is in fact quite different from, the interactionist models represented in the work of the Seville scientists and the work of Sterling, Hubbard and others. In contradiction to the Seville statement that, "While genes are co-involved in establishing our behavioral capacities, they do not themselves specify the outcome," in Sidanius, et al.'s version of BCI, there is a specific outcome: men are always higher on SDO. While it is true that Sidanius's research has so far upheld the theory that men are always higher on SDO, the differences are rather slight, all the research has been done in societies which are composed predominantly of populations of European decent, all the research is confined to survey methodologies (often with patchwork indexes), and, the research designs leave no reason to believe that biology is in any way the source of this invariance. Certainly, our biological endowment makes the behavior possible, but it does not make higher SDO among males inevitable. Furthermore, as with many other areas of gender difference research, initial findings of behavioral gender difference may well fade as other research teams, methodologies, and subject pools are added to the debate. Other Gender Differences The 1994 article by Sidanius, Pratto and Bobo opens by citing a number of studies that the authors describe as providing evidence of "real and robust" differences between men's and women's behavior and attitudes. While the studies cited do show some gender differences on issues such as sex-role expectations, self-esteem, self-concept and so forth, there have been several important literature reviews in the past decade that show research on gender differences to provide anything but "real and robust" evidence. Indeed, the most systematic approaches have all uniformly found that presumed gender differences are erased upon closer scrutiny of data. For example, K. Deux (1984) looked at a decade of research on gender differences and found only four areas in which there are reliable behavioral differences between men and women, and in each case gender explains less than five percent of the variance, usually closer to one percent: spatial relations, mathematics, verbal fluency, and aggression. Furthermore, the differences found have been narrowing in more recent studies, in some cases to the disappearing point. Indeed, biologist Ruth Hubbard and geneticist Anne Fausto Sterling argue that even the differences Deux 's review supported can not be sustained. Sterling's work "debunks claims that physiological differences exist in male and female brains, and that females have better verbal abilities, worse visual-spatial abilities, and less capacity for mathematics than males." (Dunne, 1994.) Cynthia Fuchs Epstein (1988) took an even more comprehensive look at the research on gender differences than Deux and also found the evidence anything but "real and robust", indeed titling her book Deceptive Distinctions. More recently, the research on differences in self-esteem between men and women was subject to a devastating critique by Christian Hoff Sommers (1994). My own review (1994) of gender differences in moral reasoning looked at exactly the two general orientations Sidanius describes as "male" and "female" as applied in the realm of moral reasoning and found no differences between men and women in terms of level of moral reasoning or frequency with which the "ranking" (justice) or "connecting" (caring) orientation is used by men and women. In short, just as the research on race differences causes an initial stir when reports of differences are circulated followed by the evaporation of those differences when brought under closer scrutiny, I see no reason to believe SDO will not suffer the same fate. Replanting Social Dominance Theory, stripped of the distracting issue of biologically rooted gender differences, is still an important contribution to political psychology. A constellation of beliefs and behaviors have been identified that seem to cluster with some consistency. If the roots of SDO are not in biology, what alternative explanation might suffice? A hint can be found in the heterogeneity and homogeneity findings mentioned above (p. 6). Sidanius, Pratto and Brief (1994) report that males' GDO scores are more heterogeneous than their co-national females, but men's level of heterogeneity does not appear to differ across nationalities. In contrast, women's GDO scores are more homogeneous than their co-national males' scores, but their GDO scores were not homogeneous across nationality. (1994, pp. 13-14.) If SDO/GDO had its roots in adaptive mechanisms commonly associated with inequalities of power, the variability findings could be explained in terms of the differential power experiences of men and women across various societies. In any given society in which there are gender based maldistributions of power, the relatively more empowered gender will have a wider distribution of power experiences than the disadvantaged gender. Thus, in the overwhelming majority of societies men will have a wider array of power experiences than women. There still will be a significant number of men whose experience of relative powerlessness equals women's experience, but far fewer women whose experience of power will be equal to that of the powerful men. Hence, if SDO is related to adaptive mechanisms in response to power, the range of adaptations will be greater for men than for women, producing greater heterogeneity in SDO scores for men, more homogeneous scores for women. Cross culturally, men's scores should show greater homogeneity since the breadth of power experiences will be similar, but women in different cultures have made differing advances toward power equality with men and hence there should be greater heterogeneity in cross cultural comparisons of women's SDO scores than men's. An interesting test of this proposition would be to compare scores in terms of heterogeneity and homogeneity from within different class experiences in the same culture and across different cultures in the same relative class. It is often the case that those on the subordinate side of a power relationship have a tendency to take on the point of view of those in power, or at least what is perceived to be the point of view of those in power. This is an adaptive mechanism that protects those in subordinant positions from experiencing the sanctions of authority. Mannoni wrote of this tendency in terms of colonialism in Prospero and Caliban, Piaget's concept of unilateral respect for authority similarly describes the child's response to the inequality between parent and child, and Lukes and Gaventa have spoken of the "third face of power" in much the same way. This might help explain why SDO scores decrease as social class increases. That is, an acceptance of hierarchy among those on the bottom can be seen as a defense mechanism dampening the potential for conflict. Likewise, the tendency to externalize and blame outgroups for one's subordination could lead those in such positions to adopt a punitive attitude toward outgroups and hence greater SDO among subordinated groups. This is not to say identification with the aggressor and externalization are the only responses to subordination. Another form of adaptation to experiences of subordination is to strengthen internal group bonds and to undermine the dominant hierarchy by promoting egalitarian social values. If in response to subordination men are more likely to identify with the aggressor and externalize, and women are more likely to strengthen group bonds and promote egalitarianism, this might be because the division of labor in most societies has removed men from their families for extended periods of the day, season or year, giving boys less well grounded models of masculinity, thus weakening ego integrity which could produce the characteristics associated with SDO. The preceding two paragraphs have merely been an attempt to provide a plausible explanation of the SDO findings that is not dependent upon BD or BCI assumptions. The conclusion to be drawn from these comments, then, is that Sidanius and his colleagues have tried to stuff too much into our genes. 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Power hierarchies, in my view, are human inventions found in both male and female social organizations. 2) The continuum is strikingly similar to Gilligan's care and justice orientations which she argues is also associated with gender differences, about which more will be said later. 3)It should be pointed out that while the article purports to be "cross cultural", all the data was collected in a single U.S. county. The subjects included a large number of immigrants from 47 different countries or territories, but they all share immigrant status. That is, each left behind, for whatever reason, their native culture and made lives in another country. They all share, therefore an immigrant subculture, which means the invariance thesis really has not been fully tested in this study. 4)The authors make a passing reference to all four models being able to predict greater religious attitudes for females than males, but the assertion is not elaborated upon. I frankly can not imagine a genuinely biological argument that would predict greater religiosity for women.