Autism Spectrum Quotient (AQ) – Self-administered

Abstract

The Autism Spectrum Quotient (AQ) is a widely utilized self-administered screening instrument designed to measure the degree of autistic traits in adults (age 16 and older) of average or above-average intelligence. Developed by Simon Baron-Cohen and colleagues, the AQ consists of 50 items that quantify traits associated with the broader Autism Spectrum Disorder (ASD), including conditions previously categorized as Asperger Syndrome or high-functioning autism. The scale provides a total score reflecting the overall intensity of autistic characteristics across five key domains: social skills, communication, imagination, attention to detail, and attention switching/tolerance of change.

Keywords

Autism Spectrum Quotient, AQ, Autism Spectrum Disorder, Asperger Syndrome, social skills, communication, attention to detail, self-report, psychological screening.

Authors

Simon Baron-Cohen, Sally Wheelwright, Rebecca Skinner, James Martin, Emma Clubley.

Purpose

The primary purpose of the Autism Spectrum Quotient (AQ) is to identify the presence and severity of autistic traits in the general population, particularly among adults who may not have received a formal diagnosis but exhibit characteristics associated with the autism spectrum. It is frequently employed in research settings to compare clinical groups (such as those with Asperger Syndrome or High-Functioning Autism) against neurotypical controls, and to explore the distribution of these traits across different occupational groups, such as scientists and mathematicians.

While the AQ is a valuable screening tool, it is not intended to be a standalone diagnostic instrument. Its main utility lies in facilitating early identification and stratification in research, helping to determine if further, more in-depth diagnostic assessment for Autism Spectrum Disorder is warranted. The instrument can be found at the following external link, which hosts the original validation paper: http://docs.autismresearchcentre.com/papers/2001_BCetal_AQ.pdf.

Construct

The AQ measures the psychological construct of autistic traits distributed along a continuum, reflecting the dimensional nature of the autism spectrum. The 50 items are structured to assess five specific domains of behavior and cognition that are hypothesized to be impacted in individuals with ASD.

These five core domains, or factors, are:

• Social Skills: Difficulties in initiating and maintaining social interactions and relationships. (Items 1, 11, 13, 15, 22, 36, 44, 45, 47, 48)
• Communication: Challenges in reciprocal conversation, interpreting non-literal language, and understanding social cues. (Items 7, 17, 18, 26, 27, 31, 33, 35, 38, 39)
• Imagination: Difficulties with pretense, mental visualization, and imaginative flexibility. (Items 3, 8, 14, 20, 21, 24, 40, 41, 42, 50)
• Attention to Detail: A tendency toward intense focus on small details, patterns, and systems, often at the expense of the “big picture.” (Items 5, 6, 9, 12, 19, 23, 28, 29, 30, 49)
• Attention Switching/Tolerance of Change: Difficulties in shifting focus between tasks or coping with changes to routines or new environments. (Items 2, 4, 10, 16, 25, 32, 34, 37, 43, 46)

Validity

Studies have consistently demonstrated the diagnostic validity of the AQ, particularly its ability to discriminate between individuals diagnosed with Asperger Syndrome or high-functioning autism and neurotypical controls. Research, notably the preliminary study by Woodbury-Smith et al. (2005), examined the scale’s utility in clinical practice, suggesting that a high total score (often established around 32 or above) is strongly indicative of the presence of clinically significant autistic traits.

The scale exhibits acceptable construct validity, as evidenced by its correlations with other measures of social cognition and empathy, such as the Empathy Quotient (EQ). Furthermore, validation studies have shown expected demographic findings, including significant sex differences in scores, with males generally scoring higher than females, aligning with epidemiological observations regarding the prevalence of Autism Spectrum Disorder.

Reliability

The Autism Spectrum Quotient generally demonstrates good internal consistency, indicating that the 50 items measure a cohesive underlying construct of autistic traits. Early validation studies reported acceptable Cronbach’s alpha coefficients for the full scale, typically ranging in the 0.70s, which is considered suitable for a broad screening instrument designed to capture diverse behavioral patterns.

Test-retest reliability has also been established, confirming the stability of AQ scores over time in adult populations. This stability suggests that the scale reliably captures enduring characteristics related to the autism spectrum, making it a dependable tool for repeated measures in longitudinal research.

Factor Analysis

The original development of the AQ confirmed a five-factor structure corresponding to the five theoretical domains (Social Skills, Communication, Imagination, Attention to Detail, and Attention Switching/Tolerance of Change). This structure was derived using principal components analysis on data gathered from clinical and non-clinical populations, providing foundational support for the theoretical model that autistic traits manifest across these distinct but related areas of functioning.

While the five-factor model is robust, subsequent research and cross-cultural validation studies have sometimes suggested alternative factor structures (e.g., three factors or a single general factor) depending on the specific sample characteristics. Nonetheless, the use of the five subscale scores remains the standard method for detailed trait profiling when utilizing the AQ in both academic and clinical research contexts.

Instrument

Test Type: Self-report screening measure.

Format: 50 items rated on a 4-point Likert scale.

Language Available: Original scale in English; numerous translations are available globally.

Population Group: General adult population and clinical populations (specifically those with High-Functioning Autism/Asperger Syndrome).

Age Group: Ages 16 and older.

Population Details: Individuals typically require average or above-average intellectual functioning to complete the self-administered questionnaire accurately. The scale is designed for use in adults and adolescents.

Test Methodology: Respondents choose one of four options: Definitely Agree, Slightly Agree, Slightly Disagree, or Definitely Disagree. Items are scored dichotomously (0 or 1). A score of 1 is assigned if the response indicates the presence of an autistic trait. The total score ranges from 0 to 50, with higher scores indicating a greater number and intensity of autistic characteristics.

Keywords

Psychological assessment, psychometrics, screening tool, factor analysis, adult autism, clinical psychology, cognitive profile.

Authors

Author ORCID Identifier: N/A (Consult specific author profiles for current ORCID information)

Affiliation Email addresses: N/A (Correspondence typically routed through the Autism Research Centre, University of Cambridge.)

Correspondence Address: Autism Research Centre, Department of Psychiatry, University of Cambridge.

Permissions & Fee and Test Year

The original conceptualization and development of the 50-item scale occurred around 1998, with the seminal validation paper published in 2001. The scale is generally available for non-commercial research and clinical use through the Autism Research Centre (ARC) website. Researchers should consult the ARC for specific licensing and permission requirements. The original PDF can be downloaded here: http://docs.autismresearchcentre.com/papers/2001_BCetal_AQ.pdf.

Reference’s

• Baron-Cohen S, Wheelwright S, Skinner R, Martin J, Clubley E (2001). The Autism-Spectrum Quotient (AQ): Evidence from Asperger Syndrome/High-Functioning Autism, Males and Females, Scientists and Mathematicians. J Autism Dev Disord, 31(1); 5-17.
• Baron-Cohen S, Wheelwright S. (2004). The Empathy Quotient: An Investigation Of Adults With Asperger Syndrome Or High Functioning Autism, And Normal Sex Differences. J Autism Dev Disord. 34(2): 163-75.
• Sucksmith E, Allison C, Baron-Cohen S, Chakrabarti B, Hoekstra RA. (2013). Empathy And Emotion Recognition In People With Autism, First-degree Relatives, And Controls. Neuropsychologia, 51(1); 98-105.
• Woodbury-Smith MR, Robinson J, Wheelwright S, Baron-Cohen S (2005). Screening Adults for Asperger Syndrome using the AQ: a Preliminary Study of its Diagnostic Validity in Clinical Practice. J Autism Dev Disord, 35(3), 331-335.
• Further information regarding the AQ and other related tests is available via the Autism Research Centre.

Items of the Autism Spectrum Quotient (AQ) – Self-administered

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way.

1. I prefer to do things with others rather than on my own.
2. I prefer to do things the same way over and over again.
3. If I try to imagine something, I find it very easy to create a picture in my mind.
4. I frequently get so strongly absorbed in one thing that I lose sight of other things.
5. I often notice small sounds when others do not.
6. I usually notice car number plates or similar strings of information.
7. Other people frequently tell me that what I’ve said is impolite, even though I think it is polite.
8. When I’m reading a story, I can easily imagine what the characters might look like.
9. I am fascinated by dates.
10. In a social group, I can easily keep track of several different people’s conversations.
11. I find social situations easy.
12. I tend to notice details that others do not.
13. I would rather go to a library than to a party.
14. I find making up stories easy.
15. I find myself drawn more strongly to people than to things.
16. I tend to have very strong interests, which I get upset about if I can’t pursue.
17. I enjoy social chitchat.
18. When I talk, it isn’t always easy for others to get a word in edgewise.
19. I am fascinated by numbers.
20. When I’m reading a story, I find it difficult to work out the characters’ intentions.
21. I don’t particularly enjoy reading fiction.
22. I find it hard to make new friends.
23. I notice patterns in things all the time.
24. I would rather go to the theater than to a museum.
25. It does not upset me if my daily routine is disturbed.
26. I frequently find that I don’t know how to keep a conversation going.
27. I find it easy to “read between the lines” when someone is talking to me.
28. I usually concentrate more on the whole picture, rather than on the small details.
29. I am not very good at remembering phone numbers.
30. I don’t usually notice small changes in a situation or a person’s appearance.
31. I know how to tell if someone listening to me is getting bored.
32. I find it easy to do more than one thing at once.
33. When I talk on the phone, I’m not sure when it’s my turn to speak.
34. I enjoy doing things spontaneously.
35. I am often the last to understand the point of a joke.
36. I find it easy to work out what someone is thinking or feeling just by looking at their face.
37. If there is an interruption, I can switch back to what I was doing very quickly.
38. I am good at social chitchat.
39. People often tell me that I keep going on and on about the same thing.
40. When I was young, I used to enjoy playing games involving pretending with other children.
41. I like to collect information about categories of things (e.g., types of cars, birds, trains, plants).
42. I find it difficult to imagine what it would be like to be someone else.
43. I like to carefully plan any activities I participate in.
44. I enjoy social occasions.
45. I find it difficult to work out people’s intentions.
46. New situations make me anxious.
47. I enjoy meeting new people.
48. I am a good diplomat.
49. I am not very good at remembering people’s date of birth.
50. I find it very easy to play games with children that involve pretending.