TCI: separating temperament from character — and the limits of that split

What separates the TCI from other personality inventories is not the number of factors but its two-layer design: an attempt to measure inborn response tendencies and the self-concept built over a life as separate things.

1. The two-layer design

Cloninger divided personality into temperament and character.

Four temperament dimensions — automatic response tendencies, appearing early and held to be substantially heritable.

Dimension	When high
Novelty Seeking (NS)	Drawn to the new, bored easily
Harm Avoidance (HA)	Worry comes first, cautious
Reward Dependence (RD)	Responsive to approval and warmth
Persistence (P)	Keeps at it without reward

Three character dimensions — about what you take as your goals and how you see yourself; held to develop and change.

Dimension	When high
Self-Directedness (SD)	Decides and takes responsibility
Cooperativeness (C)	Accepts others and works with them
Self-Transcendence (ST)	Feels part of something larger

The usefulness of the split is that it gives maturity its own axis. Low Self-Directedness and Cooperativeness were taken to indicate difficulty adapting whatever the temperament, and that is why the TCI found clinical use.

2. The part that was not well supported — neurotransmitters

Almost every introduction to the TCI carries the same passage: Novelty Seeking maps to dopamine, Harm Avoidance to serotonin, Reward Dependence to norepinephrine.

That was a hypothesis Cloninger proposed in 1987, and later research did not support it well. Evidence for a one-to-one correspondence between a temperament dimension and a specific neurotransmitter system has not accumulated sufficiently.

This does not mean the model collapsed. The descriptive usefulness of the dimensions and the question of how they are biologically implemented are separate matters. But “my harm avoidance is high because of serotonin” is not a sentence the test result supports.

3. “Temperament does not change” is also overstated

The neat split — temperament fixed, character malleable — is firmer in the telling than in the evidence.

Temperament dimensions are moderately heritable and do change with age. Novelty Seeking tends to fall and Persistence to rise over adulthood. Conversely, character dimensions do not grow on their own.

Put precisely, the difference between the layers is not whether they change but what they are dimensions of. Temperament is about how you respond to stimuli; character is about what you take as goals and how you regard yourself.

4. How to read a result

• Temperament scores are not good or bad. High Harm Avoidance is prudence and it is avoidance; low Harm Avoidance is boldness and it is recklessness. The score gives direction, not value.
• The character side is where effort has purchase. Rather than trying to lower Harm Avoidance, deciding what to do while carrying a worry-prone self (Self-Directedness) is actionable.
• It is self-report, and it came from a clinical purpose. Do not read a result as a diagnosis. The TCI is used clinically, but a score is not a diagnosis.

References

C. Robert Cloninger, Dragan M. Svrakic & Thomas R. Przybeck (1993) A psychobiological model of temperament and character, Archives of General Psychiatry 50(12) — the four-plus-three structure.

C. Robert Cloninger (1987) A systematic method for clinical description and classification of personality variants, Archives of General Psychiatry 44(6) — the original mapping of temperament onto neurotransmitters.

Kerry L. Jang et al. (1996) Heritability of the big five personality dimensions and their facets, Journal of Personality 64(3) — the standard twin-study finding of moderate heritability.

Brent W. Roberts, Kate E. Walton & Wolfgang Viechtbauer (2006) Patterns of mean-level change in personality traits across the life course, Psychological Bulletin 132(1) — a meta-analysis showing systematic change across the lifespan.