Intrinsic Motivation

What it is

Deci and Ryan's contrast separates two reasons a person might do something. An extrinsic motive sits outside the activity: payment, a grade, a threat, an audience. An intrinsic motive is the activity itself being worth doing. Their 1985 book, Intrinsic Motivation and Self-Determination in Human Behavior, is the founding statement.

This page is deliberately narrow. The three-need architecture of autonomy, competence and relatedness belongs to self-determination theory and is written up there. What sits here is the contrast, plus the claims that have been stacked on it.

The practical shape of the contrast is the useful part. Attention on an extrinsic motive has to be held in place by the reward or the threat, and removing either removes the attention. Attention on an intrinsic motive does not need holding, which is why nobody has to be disciplined into finishing a game they are enjoying.

In effect

The experimental core of the contrast is the overjustification literature, where paying people for an activity they already enjoy reduces their subsequent free-choice engagement with it. Deci, Richard Koestner and Ryan's meta-analysis of a hundred and twenty-eight experiments, published in 1999, is the anchor.

Two handling rules come with it, and they are not optional. The undermining effect should never be stated without its conditions: the reward has to be expected, tangible, contingent on engagement or completion, applied to an already interesting task, and measured as free-choice persistence. And the line that circulates in popular business writing calling this one of the most robust findings in social science is unsourced and not supported as worded. The vault has downgraded the overjustification note to mixed precisely because the two research camps agree on the facts and disagree about whether the effect is pervasive or narrowly bounded.

Two further extensions arrive in popular accounts attached to Deci's name and are not his. Jan Tonnesvang, a professor of psychology in Aarhus, has argued in interview that mastery is a basic psychological need and that a felt lack of competence shrivels attention. It maps neatly onto the competence need, and it is an interviewee talking rather than a cited paper. Lenore Skenazy argues that a childhood scheduled by adults from morning to bedtime denies a child the trial and error that reveals what they would have chosen for themselves. It is an appealing argument, it fits the theory, and it is her inference rather than a finding of Deci's. Prose that runs the two together should be read carefully.

What it does not say

It does not say that rewards always destroy motivation. The undermining effect has conditions, and outside them the finding does not apply.

It does not say that intrinsic motivation has been shown to improve attention. That extension arrives through interviews rather than measurement in the sources this vault holds, and it should not be presented as a measured finding.

It does not licence attributing the childhood argument to Deci. That is Skenazy's, offered without a study.

And it does not stand alone. The three-need architecture, the autonomy caveat and the full moderator structure of the undermining literature live in the neighbouring notes, and an argument that needs them should go there.

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