@TechReport{iza:izadps:dp7182,
            	author={Borghans, Lex and Meijers, Huub and Weel, Bas ter},
            	title={The Importance of Intrinsic and Extrinsic Motivation for Measuring IQ},
            	year={2013},
	month={Jan},
            	institution={Institute of Labor Economics (IZA)},
            	address={Bonn},
            	type={IZA Discussion Paper},
            	number={7182},
            	url={https://www.iza.org/index.php/publications/dp7182},
	abstract={This research provides an economic model of the way people behave during an IQ test. We distinguish a technology that describes how time investment improves performance from preferences that determine how much time people invest in each question. We disentangle these two elements empirically using data from a laboratory experiment. The main findings is that both intrinsic (questions that people like to work on) and extrinsic motivation (incentive payments) increase time investments and as a result performance. The presence of incentive payments seems to be more important than the size of the reward. Intrinsic and extrinsic motivation turn out to be complements.},
	keywords={cognitive test scores;incentives},
            }