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The empathizing–systemizing (E-S) theory suggests that people may be classified on the basis of their scores along two dimensions: empathizing (E) and systemizing (S). It measures a person's strength of interest in empathy (the ability to identify and understand the thoughts and feelings of others and to respond to these with appropriate emotions); and a person's strength of interest in systems (in terms of the drive to analyse or construct them). A system is anything that follows rules. Key classes of systems including mechanical systems, natural systems, abstract systems, and collectible systems. Rules in turn are defined as repeating, lawful patterns.
According to the originator of the theory, Simon Baron-Cohen, the E-S theory has been tested using the Empathy Quotient (EQ) and Systemizing Quotient (SQ), developed by him and colleagues, and generates five different 'brain types' depending on the presence or absence of discrepancies between their scores on E or S. E-S profiles show reliable sex differences in the general population (more females showing the profile E>S and more males showing the profile S>E). The E-S theory is a better predictor of who chooses STEM (Science, Technology, Engineering and Mathematics) subjects than is gender. The E-S theory has been extended into the 'Extreme Male Brain' (EMB) theory of autism and Asperger syndrome, which are associated in the E-S theory with below-average empathy and average or above-average systemizing.
E-S theory was developed by psychologist Simon Baron-Cohen as a major reconceptualization of cognitive sex differences in the general population and in an effort to understand why the cognitive difficulties in autism appeared to lie in domains in which he says on average females outperformed males and why cognitive strengths in autism appeared to lie in domains in which on average males outperformed females.
He had previously proposed the mind-blindness theory in 1985, which argued that children with autism are delayed in their development of a theory of mind, that is, the ability to understand the thoughts and feelings of themselves or others. A strength of this theory lies in its power to explain one of the core features of autism (the social and communication difficulties), but a limitation of the mindblindness theory is that it ignored the other main domain in autism (unusually narrow interests and highly repetitive behaviors, also called 'resistance to change or need for sameness'). To address this, Baron-Cohen put forward the E-S theory.
According to Baron-Cohen, females on average score higher on measures of empathy and males on average score higher on measures of systemizing. This has been found using the child and adolescent versions of the Empathy Quotient (EQ) and the Systemizing Quotient (SQ), which are completed by parents about their child/adolescent, and on the self-report version of the EQ and SQ in adults.
Similar sex differences on average have been found using performance tests of empathy such as facial emotion recognition tasks and on performance tests of systemizing such as measures of mechanical reasoning or 'intuitive physics'.
While experience and socialization contribute to the observed sex differences in empathy and systemizing, Baron-Cohen and colleagues suggest that biology also plays a role and a candidate biological factor influencing E and S is fetal testosterone (FT) (PLOS Biology, 2011). FT levels are positively correlated with scores on the Systemizing Quotient and are negatively correlated with scores on the Empathy Quotient A new field of research has emerged to investigate the role of testosterone levels in autism. Correlational research demonstrated that elevated rates of testosterone were associated with higher rates of autistic traits, lower rates of eye contact, and higher rates of other medical conditions. Furthermore, experimental studies showed that altering testosterone levels influences the maze performance in rats, having implications for human studies. The fetal testosterone theories posit that the level of testosterone in the womb influences the development of sexually dimorphic brain structures, resulting in sex differences and autistic traits in individuals.
Evolutionary explanations for sex differences
There are several evolutionary psychology explanations for this gender difference, according to Baron-Cohen. For example, better empathizing may improve care of children. Better empathy may also improve women's social network which may help in various way with the caring of children. On the other hand, systemizing may help males become good hunters and increase their social status by improving spatial navigation and the making and use of tools.
Baron-Cohen argues that sex differences are not only due to socialization.
Extreme male brain theory of autism
Baron-Cohen's work in systemizing-empathisizing led him to investigate whether higher levels of fetal testosterone explain the increased prevalence of autism spectrum disorders among males in his theory is known as the "extreme male brain" theory of autism. A review of his book The Essential Difference (ISBN 978-0-7139-9671-5) published in Nature in 2003 summarizes his proposals as: "the male brain is programmed to systemize and the female brain to empathize ... Asperger's syndrome represents the extreme male brain".
Baron-Cohen and colleagues extended the E-S theory into the extreme male brain theory of autism, which hypothesizes that autism shows an extreme of the typical male profile. This theory divides people into five groups:
- Type E, whose empathy is at a significantly higher level than their systemizing (E>S).
- Type S, whose systemizing at a significantly higher level than their empathy (S>E).
- Type B (for balanced), whose empathy is at the same level as their systemizing (E=S).
- Extreme Type E, whose empathy is above average but whose systemizing is below average (E>>S).
- Extreme Type S, whose systemizing is above average but whose empathy is below average (S>>E).
Baron-Cohen says that tests of the E-S model show that twice as many females than males are Type E and twice as many males than females are Type S. 65% of people with autism spectrum conditions are Extreme Type S. The concept of the Extreme Type E brain has been proposed; however, little research has been conducted on this brain profile.
Apart from the research using EQ and SQ, several other similar tests also have found female and male differences and that people with autism or Asperger syndrome on average score similarly to but more extremely than the average male. For example, the brain differences model provides a broad overview of sex differences that are represented in individuals with autism, including brain structures and hormone levels.
Some, but not all studies, have found that brain regions that are different in average size between males and females also differ similarly between people who have autism and those who do not have autism.
Baron-Cohen's research on relatives of people with Asperger syndrome and autism found that their fathers and grandfathers are twice as likely to be engineers as the general population. Natural science students have more relatives with autism than humanities students. Another similar finding by Baron-Cohen in California has been referred to as the Silicon Valley phenomenon, where a large portion of the population works in technical fields, and he says autism prevalence rates are ten times higher than the average of the US population. These data suggest that genetics and the environment play a role in autism prevalence, and children with technically minded parents are therefore more likely to be diagnosed with autism.
Baron-Cohen's studies have been questioned. The overrepresentation of engineers could depend on a sampling bias, and a 2010 analysis of autism diagnoses in California did not find that autism clustered preferentially around areas rich in IT industry. Instead, it found that clusters tended to occur in areas where parents were older and educated to a higher level than were parents in surrounding areas.
Another possibility has been proposed that spins the perspective of the extreme male brain. Social theorists have been investigating the concept that females have protective factors against autism by having a more developed language repertoire and more empathy skills. Female children speak earlier and use language more than their male counterparts, and the lack of this skill translates into many symptoms of autism, offering another explanation for the discrepancy in prevalence.
Imprinted brain theory
The imprinted brain theory is a somewhat similar although not identical theory. It argues that autism and psychosis are contrasting disorders on a number of variables. This is argued to be due to imbalanced genomic imprinting. According to the imprinted brain theory there could be a mismatch and more severe problems when extreme genomic imprinting occurs in the opposite sex, which would explain why female autism (and male psychosis) is often particularly severe, which is a problem for the "extreme male brain" theory which predicts the opposite.
The theory has been criticized on multiple grounds. Some research in systemizing and empathizing in early life indicates that boys and girls develop in similar ways, casting considerable doubt on the theory of sex differences in these areas. A cognitive style that more naturally opposes empathizing is Machiavellianism, which emphasizes self-interest and which has been shown to be strongly correlated with competitiveness; evolutionary theory predicts that males will be more competitive than females. In contrast, research has generally shown a weak negative correlation between empathizing and systemizing.
Another criticism is that original EQ and SQ, which form most of the research basis behind the notions of empathizing and systemizing, both clearly measure more than one factor, and that sex differences exist on only some of the factors.
As a basis for his theory, Baron-Cohen cites a study done on newborn infants in which baby boys looked longer at an object and baby girls looked longer at a person. However, a review of studies done with very young children found no consistent differences between boys and girls.
Critics say that because his work has focused on higher-functioning individuals with autism spectrum disorders, his work requires independent replication with broader samples. A Nature article published in 2011 says, "Some critics are also rankled by Baron-Cohen's history of headline-grabbing theories—particularly one that autism is an 'extreme male' brain state. They worry that his theory about technically minded parents may be giving the public wrong ideas, including the impression that autism is linked to being a 'geek'."
Time magazine said Baron-Cohen "most dramatically wandered into fraught territory in 2003, when he published the book The Essential Difference, which called autism a manifestation of an extreme 'male brain'--one that's 'predominantly hard-wired for understanding and building systems,' as opposed to a 'female brain,' one that's 'predominantly hard-wired for empathy'--and ended up on the wrong side of the debate on science and sex differences." A book review published in the journal Nature, wrote:
"The idea that males are more interested in systemizing than females merits serious consideration ... It is unquestionably a novel and fascinating idea that seems likely to generate a rich empirical body of literature as its properties are tested. The second part of the theory—that females are more empathic than males—is more problematic."
Isabelle Rapin ... finds Dr. Baron-Cohen's theory "provocative" but adds that "it does not account for some of the many neurological features of the disorder, like the motor symptoms [such as repetitive movements and clumsiness], the sleep problems or the seizures." Others worry that the term "extreme male brain" could be misinterpreted. Males are commonly associated with "qualities such as aggression," says Helen Tager-Flusberg ... "What's dangerous is that's the inference people will make: Oh, these are extreme males."
Phenomenology and the Cognitive Sciences characterized The Essential Difference as "very disappointing" with a "superficial notion of intelligence", concluding that Baron-Cohen's major claims about mind-blindness and systemizing–empathizing are "at best, dubious". The Spectator says that "The emphasis on the ultra-maleness approach is no doubt attributable to the fact that Baron-Cohen works mainly with higher functioning autism and Asperger's syndrome."
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|Look up systemize in Wiktionary, the free dictionary.|
- Online version of the EQ test
- Baron-Cohen, Simon ♦ The Male Condition The New-York Times, 8 August 2005
- Baron-Cohen, Simon ♦ They just can't help it The Guardian, 17 April 2003
- Kunzig, Robert ♦ Autism: What's Sex Got to Do with It? Psychology Today, 1 January 2004