Empathy/Systemising Quotient for Children (EQ/SQ)

Abstract

The Empathy/Systemising Quotient for Children (EQ/SQ-Child) is a standardized, parent-report psychometric instrument designed to assess individual differences in two fundamental neurocognitive domains: empathizing—the drive to identify, predict, and respond appropriately to the mental and emotional states of others—and systemizing—the drive to analyze, construct, and predict the behavior of rule-governed, deterministic systems. Developed by Bonnie Auyeung, Sally Wheelwright, Carrie Allison, Matthew Atkinson, Niranjala Samarawickrema, and Simon Baron-Cohen (2009) at the Autism Research Centre, University of Cambridge, the tool adapts and integrates the adult Empathy Quotient (EQ) and Systemizing Quotient (SQ) into a unified 55-item questionnaire tailored for pediatric cohorts aged 4 to 11 years. The questionnaire comprises 27 items dedicated to the Children’s Empathy Quotient (EQ-C) and 28 items dedicated to the Children’s Systemizing Quotient (SQ-C), measured on a 4-point Likert scale with a symptom-direction weighting scoring system (0, 1, or 2 points per item, yielding maximum scores of 54 on EQ-C and 56 on SQ-C). Psychometric evaluations demonstrate robust internal consistency (Cronbach’s α typically ranging between .85 and .89 for EQ-C, and .78 to .88 for SQ-C), strong test-retest stability (r > .80 across multi-month intervals), and solid construct, convergent, and discriminant validity. Furthermore, factor analyses support a clear two-dimensional macro-structure. The EQ/SQ-Child operationalizes Baron-Cohen’s Empathizing-Systemizing (E-S) theory and the Extreme Male Brain (EMB) theory of autism in pediatric populations, establishing systematic sex differences in typical neurodevelopment (with typical females scoring significantly higher on EQ-C and typical males scoring higher on SQ-C) and characterizing the cognitive phenotype of autism spectrum conditions (ASC), which show marked deficits in empathizing alongside preserved or superior systemizing.

Keywords

Empathy Quotient for Children, Systemising Quotient for Children, EQ-C, SQ-C, Empathizing-Systemizing Theory, Extreme Male Brain Theory, Autism Spectrum Conditions, Psychometrics, Parent-Report Questionnaire, Sex Differences, Cognitive Phenotypes, Social Cognition, Rule-Governed Systems

Authors

The Empathy/Systemising Quotient for Children was conceptualized, operationalized, and psychometrically validated by a collaborative research team based at the Autism Research Centre (ARC) within the Department of Psychiatry at the University of Cambridge, United Kingdom:

• Bonnie Auyeung, Ph.D. — Autism Research Centre, Department of Psychiatry, University of Cambridge, Cambridge, UK; and School of Philosophy, Psychology and Language Sciences, University of Edinburgh, Edinburgh, UK.
• Sally Wheelwright, M.A. — Autism Research Centre, Department of Psychiatry, University of Cambridge, Cambridge, UK.
• Carrie Allison, Ph.D. — Autism Research Centre, Department of Psychiatry, University of Cambridge, Cambridge, UK.
• Matthew Atkinson, B.Sc. — Autism Research Centre, Department of Psychiatry, University of Cambridge, Cambridge, UK.
• Niranjala Samarawickrema, B.Sc. — Autism Research Centre, Department of Psychiatry, University of Cambridge, Cambridge, UK.
• Simon Baron-Cohen, Ph.D., FBA, FMedSci — Professor of Developmental Psychopathology, Director of the Autism Research Centre, Department of Psychiatry, University of Cambridge, Cambridge, UK; Fellow of Trinity College, Cambridge.

Institutional Contact & Correspondence: Autism Research Centre, Department of Psychiatry, Cambridge University, Douglas House, 18b Trumpington Road, Cambridge, CB2 8AH, United Kingdom.

Purpose

The primary clinical and empirical objective of the EQ/SQ-Child is to quantitatively index childhood variation across two overarching cognitive axes: socio-emotional empathy and deterministic systemizing. In human developmental psychology, the transition between early childhood and middle childhood represents a critical window during which social cognitive skills (such as theory of mind, emotional resonance, and reciprocal peer engagement) and non-social cognitive competencies (such as spatial reasoning, mechanical curiosity, categorizing, and hierarchical ordering) become increasingly sophisticated and observable to primary caregivers.

The scale was engineered to address several distinct diagnostic and methodological needs:

• Clinical Phenotyping of Neurodevelopmental Conditions: Autism spectrum conditions (ASC) are behaviorally characterized by difficulties in mutual social communication and interaction alongside restricted, repetitive patterns of behavior, narrow interests, and insistence on sameness. The EQ/SQ-Child allows clinicians to profile a child’s specific cognitive architecture by testing whether their cognitive profile reflects low empathizing combined with average or hyper-developed systemizing.
• Operationalization of Brain Types: The measure allows researchers to compute standardized difference scores (termed D-scores), which position an individual child into one of five cognitive profiles: Type E (Empathizing dominant), Type S (Systemizing dominant), Type B (Balanced), Extreme Type E, or Extreme Type S. This typology provides an empirical foundation for investigating sex differences, neurodevelopmental trajectories, and cognitive endophenotypes.
• Developmental Research on Gender Disparities: Extensive evolutionary and developmental literature points toward normative sex-linked differences in cognitive and play styles. The instrument captures how typical boys and typical girls differ along social-relational versus mechanical-abstract orientations using a standardized, psychometrically validated parent-report format.
• Biomarker and Longitudinal Association Studies: The EQ/SQ-Child serves as a behavioral endpoint in longitudinal cohorts investigating the prenatal neuroendocrine environment, such as the relationship between amniotic fetal testosterone (fT) or maternal estrogens and subsequent neurodevelopmental outcomes in childhood.

Psychological Construct

The EQ/SQ-Child measures two distinct yet conceptually interacting constructs: empathizing and systemizing.

1. Empathizing (EQ-C Dimension)

Empathizing is defined as the multi-component capacity to comprehend, identify, anticipate, and respond appropriately to the emotional states, intentions, beliefs, and behaviors of other agents. In the EQ/SQ-Child, empathy is operationalized across three interrelated developmental facets:

• Cognitive Empathy (Theory of Mind / Perspective-Taking): The cognitive capacity to attribute mental states to oneself and others, infer what another person is thinking or feeling, decode subtle non-verbal cues (e.g., eye gaze, tone of voice, facial expressions), and adjust one’s behavior according to unwritten social norms. Sample items assess whether the child can tell if someone is masking true emotions or intuitively grasp if someone wants to enter a conversation.
• Affective Empathy (Emotional Reactivity & Resonance): The visceral, emotional response triggered by witnessing another individual’s affective experience. This involves experiencing an appropriate emotional reaction to another’s distress, happiness, or discomfort (e.g., getting visibly upset when witnessing someone else crying, or worrying about hurt feelings).
• Prosocial Behavioral Engagement: The application of empathic understanding to social interactions, manifested in spontaneous turn-taking, comforting behaviors, avoiding socially insensitive remarks, and maintaining reciprocal friendships.

2. Systemizing (SQ-C Dimension)

Systemizing is defined as the drive to analyze, explore, construct, and predict the behavior of rule-based systems. A system operates on deterministic or probabilistic input-operation-output rules (“if p occurs under conditions c, then q invariably follows”). The SQ-C operationalizes this construct across six distinct domains of systems encountered by children:

• Technical / Mechanical Systems: Curiosity about physical and electronic machinery, understanding internal mechanisms of clocks, household appliances, engines, video recorders, and tools.
• Natural Systems: Interest in biological classifications, animal habitats, weather patterns, geographic formations, tidal movements, and anatomical features.
• Abstract Systems: Fascination with numerical patterns, mathematical sequences, statistical data, dates, calendars, transport networks, and syntactic or grammatical rules.
• Organizable / Taxonomical Systems: Spontaneous drives to collect, categorize, sort, catalogue, and alphabetize physical objects (such as cards, coins, shells, or books) according to precise parameters.
• Motoric Systems: Mastering repetitive, rule-governed physical motions or games governed by strict, unalterable criteria (such as martial arts, chess, dominoes, or building models via explicit step-by-step schematics).
• Social / Predictable Routines: Insistence on exact adherence to schedules, routes, timetables, and procedural predictability, where deviation from the established sequence causes noticeable cognitive friction.

Theoretical Framework

The theoretical bedrock of the EQ/SQ-Child rests upon two influential frameworks formulated by Simon Baron-Cohen: the Empathizing-Systemizing (E-S) Theory and the Extreme Male Brain (EMB) Theory of Autism.

The E-S theory posits that human cognitive variation can be effectively mapped across a two-dimensional Cartesian plane defined by an individual’s empathizing capacity along the y-axis and systemizing capacity along the x-axis. Because the social world is non-linear, context-dependent, and governed by ambiguous, rapidly evolving emotional states, it cannot be successfully mastered using rigid, deterministic rules; it necessitates empathizing. Conversely, physical, mechanical, mathematical, and abstract phenomena conform to immutable laws and predictable cause-and-effect loops; these domains require systemizing.

According to E-S theory, these two dimensions are relatively independent, generating five distinct cognitive phenotypes (or “brain types”):

• Type B (Balanced): Individuals whose empathizing and systemizing abilities are equally developed (E ≈ S).
• Type E (Empathizing): Individuals whose empathizing drive is significantly more developed than their systemizing drive (E > S). Statistically, more typical females display this profile.
• Type S (Systemizing): Individuals whose systemizing drive is significantly more developed than their empathizing drive (S > E). Statistically, more typical males display this profile.
• Extreme Type E: Individuals with highly superior empathizing alongside below-average or impaired systemizing (E >> S).
• Extreme Type S: Individuals with preserved, superior, or hyper-developed systemizing alongside severely compromised or impaired empathizing (S >> E).

Building upon E-S theory, the EMB theory proposes that autism represents an extreme exaggeration of the typical male cognitive profile. Under this biological-developmental model, exposure to elevated levels of prenatal androgens (specifically fetal testosterone, fT) organizes developing neural architecture to optimize rule-based parsing and pattern identification at the expense of intuitive socio-communicative processing. The EQ/SQ-Child was explicitly designed to validate this theoretical model in childhood, testing whether neurotypical sex differences emerge early in ontogeny and whether autistic children cluster disproportionately within the Extreme Type S category.

Validity

Empirical evaluations of the EQ/SQ-Child have demonstrated solid psychometric validity across multiple independent international cohorts.

1. Known-Groups and Construct Validity

In the seminal validation study by Auyeung et al. (2009), the instrument was administered to parents of 1,256 typically developing children (627 boys and 629 girls, aged 4 to 11 years) and 125 children clinically diagnosed with an Autism Spectrum Condition (ASC; 107 boys and 18 girls). The findings demonstrated striking known-groups validity:

• Sex Differences in Typical Development: Typical girls scored significantly higher on the EQ-C (Mean = 37.89, SD = 8.16) than typical boys (Mean = 31.84, SD = 8.44; p < .001, Cohen’s d ≈ 0.73). Conversely, typical boys scored significantly higher on the SQ-C (Mean = 26.68, SD = 8.35) than typical girls (Mean = 21.05, SD = 7.15; p < .001, Cohen’s d ≈ 0.72).
• Clinical Contrast (ASC Profile): Children with ASC scored markedly lower on the EQ-C (Mean = 15.02, SD = 6.43) than both typical boys and typical girls (p < .001). On the SQ-C, children with ASC achieved significantly higher scores (Mean = 31.80, SD = 8.78) than typical girls (p < .001) and typical boys (p < .001).
• Brain Type Distribution: While typical children were distributed across Type B, Type E, and Type S, over 97% of children diagnosed with ASC met criteria for either Type S or Extreme Type S, providing decisive empirical validation for the EMB model.

2. Convergent and Discriminant Validity

The EQ-C demonstrates strong negative correlations with the Autism Spectrum Quotient – Children’s Version (AQ-Child) total score (r ≈ -.72, p < .001), indicating that lower empathy relates closely to broader autistic symptomatology. Furthermore, the EQ-C correlates positively with established measures of pediatric empathy, such as the Griffith Empathy Measure (GEM) and the parent-report Interpersonal Reactivity Index (IRI). The SQ-C exhibits moderate positive correlations with the AQ-Child attention to detail and patterns subscales, while remaining uncorrelated or weakly negatively correlated with measures of verbal intelligence, indicating that systemizing is not a mere proxy for general cognitive ability (IQ).

Reliability

The EQ/SQ-Child exhibits high reliability across diverse samples and language adaptations:

• Internal Consistency: In the initial development cohort (Auyeung et al., 2009), the EQ-C demonstrated high internal consistency, yielding a Cronbach’s alpha of α = .88 among typical children and α = .86 among children with ASC. The SQ-C achieved an alpha of α = .80 among typical controls and α = .78 in the clinical group. Subsequent cross-cultural adaptations (e.g., Italian, Japanese, and Dutch versions) have replicated these indices, reporting EQ-C alphas between .84 and .89, and SQ-C alphas between .79 and .86.
• Test-Retest Stability: Evaluation of a subsample of parents completing the questionnaire over a 3- to 6-month interval demonstrated high temporal stability. The intraclass correlation coefficient (ICC) was .85 for the EQ-C and .82 for the SQ-C, indicating that parental ratings of these cognitive dispositions reflect enduring behavioral tendencies rather than transient situational fluctuations.
• Inter-Rater Reliability: Studies comparing maternal and paternal ratings have shown substantial inter-parent agreement (Pearson’s r typically between .70 and .79 for both subscales), establishing that the behavioral operationalizations are observable across differing home contexts.

Factor Analysis

Exploratory Factor Analyses (EFA) and Confirmatory Factor Analyses (CFA) have confirmed the structural independence of the two main dimensions:

Initial principal components analysis with varimax rotation revealed two dominant orthogonal factors accounting for the majority of the variance, directly corresponding to the hypothesized Empathizing and Systemizing constructs. Items loading significantly on Factor 1 (> .35) were virtually identical to the 27 designated EQ-C items, with high positive loadings on prosocial interest, affective distress in response to others’ pain, and mental state attribution, and negative loadings on social insensitivity and bluntness. Items loading on Factor 2 corresponded to the 28 SQ-C items, spanning technical fascination, classification, and strict adherence to rule-based patterns.

Subsequent multi-group Confirmatory Factor Analyses (CFA) evaluated whether a two-factor overarching model fits the observed data better than a single-factor cognitive style model. The two-factor model yields superior fit indices (Comparative Fit Index [CFI] > .90, Tucker-Lewis Index [TLI] > .90, and Root Mean Square Error of Approximation [RMSEA] ≤ .05). Furthermore, hierarchically nested models have identified meaningful lower-order sub-factors within the primary dimensions:

• Within EQ-C: Three coherent sub-factors emerge: (1) Cognitive Empathy / Perspective-Taking, (2) Emotional Reactivity, and (3) Social Reciprocity / Awareness.
• Within SQ-C: Four secondary components are identified: (1) Mechanical / Technical Interest, (2) Pattern Recognition & Categorization, (3) Rule-Based Play / Routines, and (4) Abstract / Fact-Based Information Acquisition.

Instrument / Measurement Tool

The EQ/SQ-Child is a structured, parent-completed psychometric assessment instrument designed for clinical and developmental research.

• Format & Administration: Parent-report questionnaire (pen-and-paper or digital administration). Completion time is approximately 10 to 15 minutes.
• Target Population: Children aged 4 to 11 years (with extensions into early adolescence, ages 12–14, utilized in longitudinal studies).
• Total Items: 55 Likert-style items presented in a standardized mixed sequence.
• Subscale Composition:
  • Children’s Empathy Quotient (EQ-C): 27 items (Items: 1, 4, 6, 8, 9, 13, 14, 15, 17, 19, 21, 23, 24, 27, 28, 30, 31, 33, 34, 37, 39, 41, 44, 46, 48, 51, 54).
  • Children’s Systemizing Quotient (SQ-C): 28 items (Items: 2, 3, 5, 7, 10, 11, 12, 16, 18, 20, 22, 25, 26, 29, 32, 35, 36, 38, 40, 42, 43, 45, 47, 49, 50, 52, 53, 55).
• Response Format: 4-point Likert scale: Definitely Agree, Slightly Agree, Slightly Disagree, Definitely Disagree.
• Scoring Algorithm:
  • To minimize response bias, items are keyed positively or reversely. Each item is scored on a 0–1–2 basis.
  • Positively keyed items: “Definitely Agree” = 2 points, “Slightly Agree” = 1 point, “Slightly Disagree” = 0 points, “Definitely Disagree” = 0 points.
  • Reversely keyed items: “Definitely Disagree” = 2 points, “Slightly Disagree” = 1 point, “Slightly Agree” = 0 points, “Definitely Agree” = 0 points.
  • Total Score Ranges: EQ-C score ranges from 0 to 54. SQ-C score ranges from 0 to 56.
  • Brain Type (D-Score) Computation: Standardized scores are derived via:
    
    D = (Standardized SQ - Standardized EQ) / 2,
    
    where Standardized EQ = (EQ - Mean EQ) / Maximum EQ and Standardized SQ = (SQ - Mean SQ) / Maximum SQ.

Permissions & Fee and Test Year

The EQ/SQ-Child was formally published in 2009 by Bonnie Auyeung and colleagues at the Autism Research Centre (ARC), University of Cambridge.

Licensing & Availability: The instrument is open-access for non-commercial academic research, clinical assessments, and educational use. Researchers and clinicians can download the questionnaire and scoring keys free of charge directly from the official repository of the Autism Research Centre (www.autismresearchcentre.com/tests/). Reproduction or commercial redistribution within fee-for-service software requires formal permission from the original authors and the Autism Research Centre.

References

Below are primary foundational references for the scale and its theoretical framework:

• Auyeung, B., Wheelwright, S., Allison, C., Atkinson, M., Samarawickrema, N., & Baron-Cohen, S. (2009). The Children’s Empathy Quotient and Systemizing Quotient: Sex differences in typical development and in autism spectrum conditions. Journal of Autism and Developmental Disorders, 39(11), 1509–1521. https://doi.org/10.1007/s10803-009-0772-x
• Baron-Cohen, S. (2002). The extreme male brain theory of autism. Trends in Cognitive Sciences, 6(6), 248–254. https://doi.org/10.1016/S1364-6613(02)01904-6
• Baron-Cohen, S. (2009). Autism: The empathizing–systemizing (E-S) theory. Annals of the New York Academy of Sciences, 1156(1), 68–80. https://doi.org/10.1111/j.1749-6632.2009.04467.x
• Baron-Cohen, S., & Wheelwright, S. (2004). The Empathy Quotient: An investigation of adults with Asperger syndrome or high functioning autism, and normal sex differences. Journal of Autism and Developmental Disorders, 34(2), 163–175. https://doi.org/10.1023/B:JADD.0000022607.19833.00
• Baron-Cohen, S., Richler, J., Bisarya, D., Gurunathan, N., & Wheelwright, S. (2003). The Systemizing Quotient: An investigation of adults with Asperger syndrome or high-functioning autism, and normal sex differences. Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences, 358(1430), 361–374. https://doi.org/10.1098/rstb.2002.1206
• Wheelwright, S., Baron-Cohen, S., Goldenfeld, N., Delaney, J., Fine, D., Smith, R., Weil, L., & Wakabayashi, A. (2006). Predicting Autism Spectrum Quotient (AQ) from the Systemizing Quotient-Revised (SQ-R) and Empathy Quotient (EQ). Brain Research, 1079(1), 47–56. https://doi.org/10.1016/j.brainres.2006.01.012

13. Items of the Scale (Questionnaire)