Jansen Effect (Dan Jansen) illustration
Psychology / Performance / Pressure
Psychology / Performance / Pressure

Jansen Effect (Dan Jansen)

Excellent training performance can crumble in competition.

Popularity
Usefulness
Aliases
Dan Jansen effect / choking-in-competition effect
Domains
Psychology, performance, sports, pressure

Definition

  • The Jansen Effect describes how an athlete (or performer) who is strong and consistent in training repeatedly fails in actual competition — peak ability collapsing under the pressure of the big moment.

Core Idea

  • Excellent training performance can crumble in competition.
  • High-stakes pressure undermines proven ability.
  • The decisive battle is psychological as much as physical.

How It Works

  • In training, free of pressure, skill performs at its true level.
  • In competition, expectation and anxiety disrupt focus and execution.
  • The performer underperforms — repeatedly, if the pressure pattern is not addressed.

Usage Example

  • A capable employee who shines in preparation freezes in the high-stakes pitch — a textbook Jansen Effect that mental preparation and pressure exposure could ease.

Famous Example

  • Example: Named for American speed skater Dan Jansen, renowned in training and as a favorite, who repeatedly faltered at the Olympics before finally winning gold in 1994.
  • Why it fits this rule: His career is the archetypal story of choking under competitive pressure — and ultimately overcoming it.
  • Verification status: Dan Jansen is a real, well-documented Olympic speed skater; the "Jansen effect" is a popular label for choking under pressure.

Use Cases / Situations Where It Applies

  • Performance under pressure (sport, exams, presentations).
  • Managing competitive anxiety.
  • Coaching and mental preparation.

When Not to Use or Common Misuse

  • Do not label every competitive failure as choking.
  • Do not raise pressure expecting it to sharpen performance.
  • Do not ignore that pressure can be trained for and overcome (as Jansen did).

Rule Invention / Origin

  • Invented by: No single attributed author; named from Dan Jansen's career.
  • Year of invention: Modern (Jansen's Olympic career, 1984–1994).
  • Country / context of origin: United States (popular psychology framing).

Evidence / Research Basis

  • Consistent with research on choking under pressure and the Yerkes-Dodson law.