Agents in numerous jobs and sectors are paid on a performancecontingent basis. There exists an increasing global demand for an online workforce whose pay, or part of it, will also be based on performance. Several papers have shown that performance-contingent payments improve quality and effort compared to non-contingent compensation systems. To the contrary, experimental evidence from Ariely et al (2009) show that workers' performance does not improve despite relatively large magnitude rewards; and that the large magnitude has a detrimental effect on performance caused by overreaction or "choking." Performance may also be hampered by low magnitude rewards since it damages intrinsic motivation as shown by Gneezy & Rustichini (2000). In addition, Yin et al (2013) show that absolute magnitude of rewards alone does not affect agent's performance, but changing the magnitude over a sequence of tasks does. Ho et al (2015) identify effort-responsive tasks and the extent of appropriateness of performance-contingent financial incentives (PCFI). To test the impact of PCFI, we design a large-scale field experiment using the online labor market Amazon Mechanical Turk (MTurk) to evaluate agents' response to monetary incentives over a sequence of three cognitive games: NBack, Stroop and Iowa. Our findings suggest that small magnitude incentives can alleviate the choking effect, improving performance by 3.5% (*p
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