Intrinsic motivation comes from the activity itself

What it is

Intrinsic motivation is the drive to do an activity for the inherent satisfaction it provides — the process is the reward. Reading, puzzle-solving, creating, and exploring are typically sustained this way. It contrasts with extrinsic motivation, which is driven by separable outcomes: points, money, rank, or avoiding punishment. The distinction is the founding axis of self-determination theory and of motivation research generally.

Why it happens

For intrinsically motivated behavior the perceived locus of causality sits inside the person: curiosity, the experience of mastery, and the feeling of choosing for oneself act as reinforcers, requiring no external ledger or supervision to keep the behavior going. Exploration and mastery tendencies are evolved equipment — humans are wired to find moderately novel, comprehensible environments interesting and to linger at the edge of their own growing competence. Two engineering consequences follow. Once established, intrinsic motivation is very cheap to maintain — no continuous reward settlement needed. But it depends entirely on the fit between task and person: the same activity is play for one user and drudgery for another, and that fit cannot be forced into existence by an interface.

Studying it

• Paradigm: the standard measure is the free-choice paradigm — after the official session ends and any reward is settled, does the participant keep doing the activity during unstructured alone time, when there is nothing left to gain? Self-reported interest scales are collected alongside.
• Variables: typical manipulations are reward type and delivery, provision of choice, and feedback framing; outcomes are free-choice persistence, interest ratings, and long-run retention.
• Methodological cautions: behavioral frequency is not intrinsic motivation — dutiful or socially pressured heavy use contaminates the measure; the details of the free-choice period (what alternatives are in the room) directly shape results; self-reported interest and actual persistence often diverge, so take both.

Where it stops holding

Intrinsic motivation exists only where genuine interest exists. Monotonous, repetitive, unchallenging tasks have no interest to undermine — extrinsic incentives carry no crowding-out cost there, and the design calculus is entirely different. Interest is also unstable: it appears and disappears as competence develops, and a novice's professed interest rarely survives early frustration. Finally, "intrinsic" says nothing about direction — the joy of exploration drives aimless scrolling just as well as it drives craft.

Applying it

• First decide whether the target behavior can be intrinsically interesting for the target user (creation, mastery, and exploration usually can; data entry and routine verification usually cannot), then choose intrinsic or extrinsic supports accordingly.
• Where interest is possible, build feedback as a source of competence information (graded difficulty, visible progress) and leave choice with the user — what, when, and how — rather than layering reward ledgers on top.
• Accept extrinsic scaffolding for novices, but design its exit and hand off to intrinsic satisfaction over time.
• To validate: open an observation window with all incentives switched off and measure how much of the core behavior survives — the surviving part is what intrinsic motivation was carrying.

Related

• Same group: P2.01.2 Extrinsic rewards can crowd out intrinsic motivation · P2.01.3 Behavior often drops after rewards are withdrawn · P2.01.4 Autonomy, competence, and relatedness are the three sources of intrinsic motivation · P2.01.5 Informational feedback does not crowd out; controlling feedback does · P2.01.6 Tasks with no intrinsic interest have no crowding-out problem · P2.01.7 Unexpected after-the-fact rewards harm less than promised ones
• Nearby: P2.02 Gamification elements · P1.02 Pleasure points
• Search terms: intrinsic motivation · self-determination theory · free-choice paradigm