Intrinsic Motivation: The Search for Optimal Motivation: Summary & Key Insights

When psychologists first attempted to explain motivated behavior, the reigning paradigm was behaviorism. The behaviorists believed that behavior could be fully understood as responses to environmental contingencies—rewards, punishments, reinforcements. Motivation, in that sense, was seen as external control. If one wanted a certain behavior, one merely had to pair it with positive consequences. Yet as I reviewed the evidence, I found cracks in this logic. Children drawing for pleasure would stop doing so once they began receiving rewards for it; adults solving puzzles purely for enjoyment would lose interest when payment was introduced. These paradoxes suggested that behaviors once internally driven could be undermined by external rewards.

In my early experiments at Carnegie Mellon University, I worked with subjects solving SOMA puzzles—a creative, spatial task that many people find engaging. What I discovered was unexpected: those who were paid for solving the puzzles showed less subsequent voluntary engagement than those who were not paid. It was as if the reward signaled that the puzzle was no longer theirs—that their motivation had shifted from curiosity to compliance. This was a turning point in motivational research. The notion that rewards could actually *decrease* intrinsic interest contradicted decades of reinforcement theory.

To understand why this happens, one must appreciate the nature of intrinsic motivation. It is not sustained by tension reduction or external control but by an inherent desire to explore and to master. Human beings, I argued, are organismically oriented toward optimal challenges—tasks that stretch their capacities without overwhelming them. When an environment is structured to provide freedom and competence feedback, intrinsic motivation thrives. When that environment becomes controlling—when we feel pressured to perform—our engagement diminishes.

Historical perspectives also reveal this shift. Early theorists such as Hull and Skinner saw motivation as mechanistic, driven by deficits and reinforcements. But emerging research on play, curiosity, and effectance motivation, from scholars like White, Harlow, and deCharms, began to paint a more nuanced picture: people are not simply reactive, they are self-initiating organisms. Their performance is not merely conditioned but chosen. This reframing laid the groundwork for a more humanistic, cognitively grounded view of motivation—one that values meaning, autonomy, and self-regulation as central to behavior.

At the core of intrinsic motivation lies autonomy—the feeling that one’s actions are self-endorsed, freely chosen, and aligned with personal values. Autonomy does not imply independence from others but the freedom to act according to one’s integrated sense of self. In experimental work, I repeatedly found that when people perceived their behavior as self-determined, their energy, creativity, and persistence increased. Conversely, when they felt controlled—by rewards, deadlines, or surveillance—their motivation shifted from intrinsic to extrinsic, and their performance quality suffered.

Autonomy, however, does not exist in a vacuum. It is intertwined with competence—the need to feel effective in one’s interactions with the environment. Feedback that validates capability can enhance intrinsic motivation, whereas feedback that feels evaluative or controlling can undermine it. For instance, in learning environments, students flourish when they are given informational feedback—guidance that acknowledges progress and offers challenge without coercion. But when feedback becomes a tool for control, such as grades designed to enforce compliance, students’ natural curiosity collapses.

This dual dynamic—autonomy and competence—led to the formulation of cognitive evaluation theory, a model that explains how social and environmental factors affect intrinsic motivation. According to the theory, any external event has two primary aspects: a controlling aspect and an informational aspect. Controlling events pressure individuals to behave in certain ways, reducing perceived autonomy. Informational events, by contrast, convey competence and promote intrinsic engagement. Whether an event strengthens or weakens intrinsic motivation depends on which aspect is more salient.

Social relatedness, though not originally formalized in cognitive evaluation theory, also emerged as vital. People’s motivation is deeply affected by the interpersonal context—whether they feel connected, respected, and cared for. Autonomy-supportive relationships nurture growth; controlling ones create anxiety and disengagement. Thus, intrinsic motivation flourishes in environments that balance freedom with structure, where competence is affirmed and relatedness is secure.

Through this lens, motivation ceases to be a matter of external incentives and becomes a question of trust: Do we trust people to be naturally inclined toward growth, or must we direct them with rewards and punishments? My research convinces me of the former. Human beings are self-regulating organisms who, when supported by autonomy, competence, and relatedness, display remarkable energy and creativity.