What -A and -T mean in personality types: Assertive vs Turbulent, and how it relates to neuroticism
By the 64 Types team · Updated October 21, 2026 · 7 min read · 13 peer-reviewed sources
In a 16Personalities result such as INFP-T or ENFJ-A, the letter after the hyphen is a fifth scale the company calls Identity: -A stands for Assertive and -T for Turbulent.[1] 16Personalities describes Assertive people as self-assured, even-tempered and resistant to stress, and Turbulent people as self-conscious, sensitive to stress, success-driven, perfectionistic and eager to improve.[2] It presents the two as a spectrum and says neither is better: the difference is not about capability.[3]
That description closely resembles a trait psychologists have studied for decades: neuroticism, the tendency to react to threat, frustration or loss with anxiety, irritability and low mood, whose opposite pole is emotional stability.[4] The four classic type letters do not measure it.[5] Below we explain what -A and -T mean, where they overlap with neuroticism and where they do not, and how 64 Types measures the same territory as the fifth letter of its code: C (Composed) or R (Responsive).
What -A and -T mean in a 16Personalities code
16Personalities builds its codes from five aspects: Energy (Introverted or Extraverted), Mind (Intuitive or Observant), Nature (Thinking or Feeling), Tactics (Judging or Prospecting) and Identity (Assertive or Turbulent). The first four give the familiar four letters; Identity adds the suffix. The company describes each aspect as a continuum, and the percentages shown after its test indicate how strongly someone leans to one side.[2]
According to 16Personalities, the Identity aspect is about how people relate to self-confidence, self-doubt, stress and feedback,[1] and it shapes how they respond to success, failure and unexpected change.[3] Paraphrasing its own descriptions:
| Assertive (-A) | Turbulent (-T) | |
|---|---|---|
| Under pressure | Stays even-tempered; worry and doubt rarely take over | Reacts more strongly; worries more and feels stress more deeply |
| Confidence | Comes from within; not easily swayed by others’ opinions | Tested against the world; more self-doubt and self-consciousness |
| Setbacks | Seen as temporary; moves on without dwelling on regrets | More likely to dwell on criticism, mistakes and regrets |
| Drive | Cares about outcomes but is relaxed about imperfections | Driven to prove themselves and improve weaknesses; perfectionistic |
| Possible pitfall | Overconfidence; overlooking real problems or details | Self-criticism and rumination |
So INFP-T simply means an INFP who scored on the Turbulent side of this scale, and INFP-A one who scored on the Assertive side. The four letters are the same; only the fifth scale differs. 16Personalities notes that the most effective people learn to use both approaches when a situation calls for it.[3]
16Personalities is run by NERIS Analytics Limited, a separate company, which calls its model the NERIS Type Explorer and describes it as proprietary. It also asks that its codes not be treated as interchangeable with the MBTI.[1] 64 Types is not affiliated with either.
Example: INFP-A vs INFP-T
16Personalities’ article on the two kinds of INFP (its “Mediator” type) illustrates the idea. In its account, Turbulent INFPs are harder on themselves, more likely to read a mistake as proof of failure, and report stronger negative emotions such as regret; they also check in with others more often, which can make them attentive listeners. Assertive INFPs feel more comfortable with themselves and treat errors as one-off slips, but may skip useful feedback or overlook problems they have dismissed.[6]
As in the general description, the -A/-T contrast is about self-assurance and stress reactivity, not about the type’s interests or values. The article also quotes survey percentages for each group, but it does not report sample sizes or methods,[6] so we do not repeat them here.
How -A/-T relates to neuroticism (emotional stability)
In the Big Five model, neuroticism is measured with statements such as “I get stressed out easily”, “I worry about things” and “I change my mood a lot”, and, reverse-scored, “I am relaxed most of the time”.[7] Detailed inventories split it into six facets: anxiety, anger, depression, self-consciousness, immoderation and vulnerability to stress.[8] Set side by side with 16Personalities’ wording, the overlap is easy to see:
| Turbulent description (16Personalities) | Closest neuroticism facet (Johnson, 2014) |
|---|---|
| Sensitive to stress, emotionally reactive[2][3] | Vulnerability, anxiety[8] |
| Self-conscious[2] | Self-consciousness[8] |
| Worry, self-doubt, dwelling on regrets[3] | Anxiety, depression[8] |
There are also differences. 16Personalities describes Turbulent people as success-driven, perfectionistic and eager to improve.[2] None of the six neuroticism facets is about striving; in the Big Five, setting high goals and working hard toward them is the achievement-striving facet of conscientiousness.[8] Its Assertive pole, in turn, includes self-assurance and decisiveness, which go beyond simply not being anxious.[3]
16Personalities says it reworked the dimensions of the Big Five rather than using Jungian concepts,[2] but in the articles we checked it does not equate Identity with neuroticism, and because its questions and scoring are proprietary,[1] we cannot say how strongly its Identity score correlates with a standard neuroticism scale. The fairest summary is that -A/-T corresponds conceptually to emotional stability versus neuroticism, with some extra ingredients mixed in.
Why a fifth letter at all? When McCrae and Costa compared the MBTI with a Big Five inventory, its four scales lined up with Extraversion, Openness, Agreeableness and Conscientiousness, but none of them captured Neuroticism.[5] A four-letter code therefore says nothing about how someone handles stress. More on that in MBTI vs the Big Five.
Why this dimension is worth knowing
Neuroticism is one of the most consequential personality traits studied. On average, higher neuroticism is associated with:
- Mental health: every anxiety, depressive and substance-use diagnosis examined in a meta-analysis of 175 studies, with neuroticism the strongest trait correlate.[9]
- Wellbeing: lower life satisfaction and happiness; it is among the strongest personality predictors of subjective wellbeing.[10]
- Work: lower job satisfaction, the strongest trait correlation in a meta-analysis (−.29).[11]
- Relationships: partners of people lower in neuroticism report higher relationship satisfaction.[12]
These are average associations across many people, measured with research scales of neuroticism, not with the -A/-T scale itself. A high score is not a diagnosis, and many people who score high live full, successful lives. If anxiety or low mood is persistent or interfering with your life, talk to a doctor or licensed mental health professional.
For the full picture, including the six facets and what each one predicts, read Neuroticism and emotional stability explained.
Can you go from -T to -A?
Two different things can make the letter change. The first is measurement: scores on personality traits pile up near the middle rather than splitting into two camps,[13][5] so anyone close to the cutoff can land on the other side on another day. This is the main reason type letters “change” on retest.[14]
The second is real change. Emotional stability rises on average across adulthood, especially between about 20 and 40,[15] and in a review of 207 intervention studies it was the trait that changed most, over an average of 24 weeks.[16] More in Can your personality type change?
The 64 Types version: C or R (and why our “A” means something else)
64 Types measures emotional stability directly with ten public-domain Big Five items from the International Personality Item Pool,[7] converts your score into a percentile against about 20,000 real responses, and gives you a letter depending on which side of the median you fall:
- C (Composed): at or above the 50th percentile in emotional stability. You tend to stay calm under pressure and recover quickly from setbacks.
- R (Responsive): below the 50th percentile. You feel emotions intensely and notice stress quickly.
If your percentile is between 40 and 60, the letter is flagged as borderline and we show the code you would have with the other letter. Conceptually, C sits closer to the “assertive” description and R to the “turbulent” one, but the two tests use different questions and scoring, so they will not always agree. See how the 64 Types test works for the details.
In a 64 Types code, a final A means Ambitious (lower Honesty-Humility, the sixth letter), not “Assertive”, and M means Modest.[17] So a 16Personalities INFP-A is not the same as a 64 Types INFP-CA or INFP-RA: the emotional-stability letter is the fifth one, C or R.
If you are torn between the two versions of your type, the C-vs-R comparison pages walk through the differences, for example INFP-C vs INFP-R, INFJ-C vs INFJ-R and ENFP-C vs ENFP-R.
Read your percentile, not just the letter. A 52nd-percentile C and a 48th-percentile R are far more alike than a 95th-percentile C and a 5th-percentile R. Take the free test to see where you fall.
Frequently asked questions
What does the T in INFP-T mean?
It stands for Turbulent, one pole of the fifth “Identity” scale in 16Personalities’ model. The other pole is Assertive (-A).[1] Turbulent people are described as self-conscious, sensitive to stress, perfectionistic and eager to improve.[2]
Is Assertive better than Turbulent?
16Personalities says both are valid and that the difference is not about capability.[3] Research on the related trait of neuroticism finds that higher emotional stability goes with better wellbeing on average,[10] but averages say little about any one person.
Is Turbulent the same as neuroticism?
Not officially. The descriptions overlap strongly with neuroticism facets such as anxiety, self-consciousness and vulnerability to stress,[8] but 16Personalities also describes Turbulent people as success-driven,[2] and its scale is proprietary, so the link is conceptual rather than measured.[1]
References
- 16Personalities (NERIS Analytics Limited). 16Personalities AI reference. Retrieved 21 October 2026, from https://www.16personalities.com/for-ai
- 16Personalities (NERIS Analytics Limited). Our theory. Retrieved 21 October 2026, from https://www.16personalities.com/articles/our-theory
- 16Personalities (NERIS Analytics Limited). Assertive vs. Turbulent personality traits [Identity: Assertive (-A) vs. Turbulent (-T)]. Retrieved 21 October 2026, from https://www.16personalities.com/articles/identity-assertive-vs-turbulent
- Lahey, B. B. (2009). Public health significance of neuroticism. American Psychologist, 64(4), 241–256.
- McCrae, R. R., & Costa, P. T. (1989). Reinterpreting the Myers-Briggs Type Indicator from the perspective of the five-factor model of personality. Journal of Personality, 57(1), 17–40.
- 16Personalities (NERIS Analytics Limited). Assertive Mediator (INFP-A) vs. Turbulent Mediator (INFP-T). Retrieved 21 October 2026, from https://www.16personalities.com/articles/assertive-mediator-infp-a-vs-turbulent-mediator-infp-t
- Goldberg, L. R. (1992). The development of markers for the Big-Five factor structure. Psychological Assessment, 4(1), 26–42.
- Johnson, J. A. (2014). Measuring thirty facets of the Five Factor Model with a 120-item public domain inventory: Development of the IPIP-NEO-120. Journal of Research in Personality, 51, 78–89.
- Kotov, R., Gamez, W., Schmidt, F., & Watson, D. (2010). Linking "big" personality traits to anxiety, depressive, and substance use disorders: A meta-analysis. Psychological Bulletin, 136(5), 768–821.
- Steel, P., Schmidt, J., & Shultz, J. (2008). Refining the relationship between personality and subjective well-being. Psychological Bulletin, 134(1), 138–161.
- Judge, T. A., Heller, D., & Mount, M. K. (2002). Five-factor model of personality and job satisfaction: A meta-analysis. Journal of Applied Psychology, 87(3), 530–541.
- Malouff, J. M., Thorsteinsson, E. B., Schutte, N. S., Bhullar, N., & Rooke, S. E. (2010). The five-factor model of personality and relationship satisfaction of intimate partners: A meta-analysis. Journal of Research in Personality, 44(1), 124–127.
- Bess, T. L., & Harvey, R. J. (2002). Bimodal score distributions and the Myers-Briggs Type Indicator: Fact or artifact? Journal of Personality Assessment, 78(1), 176–186.
- Pittenger, D. J. (2005). Cautionary comments regarding the Myers-Briggs Type Indicator. Consulting Psychology Journal: Practice and Research, 57(3), 210–221.
- Roberts, B. W., Walton, K. E., & Viechtbauer, W. (2006). Patterns of mean-level change in personality traits across the life course: A meta-analysis of longitudinal studies. Psychological Bulletin, 132(1), 1–25.
- Roberts, B. W., Luo, J., Briley, D. A., Chow, P. I., Su, R., & Hill, P. L. (2017). A systematic review of personality trait change through intervention. Psychological Bulletin, 143(2), 117–141.
- Ashton, M. C., Lee, K., & Goldberg, L. R. (2007). The IPIP–HEXACO scales: An alternative, public-domain measure of the personality constructs in the HEXACO model. Personality and Individual Differences, 42(8), 1515–1526.
How we write guides: every research claim cites a peer-reviewed source, effect sizes are reported as published, and advice that goes beyond the evidence is labelled as a practical tip. See our methodology. Found an error? Email [email protected].
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