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This paper suggests that scores of simple tests administered without performance-based incentives may depend on test-takers' personality traits associated with their level of intrinsic motivation. As an example of a simple test, I use the coding speed test that was administered without incentives to participants in the National Longitudinal Survey of Youth (NLSY). I show that controlling for an extensive set of cognitive ability measures, the coding speed scores are correlated with the future earnings of male NLSY participants. The coding speed scores of the highly-motivated, though less-educated, group (potential recruits to the military), are higher than the NLSY participants' scores. I use controlled experiments to show directly that intrinsic motivation is an important component of the unincentivized coding speed scores. These results suggest that unincentivized test scores relate to economic success because they indicate favorable personality traits and not only cognitive skills.