Multiple types of primes have been used, but some notable are:
- Images
- Music excerpts
- Text

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Affective priming uses stimuli to alter people's affective states. For example, affective priming can make people feel happy or sad. Its aim is to boost performance in microtask crowdsourcing platforms.

Affective Priming in Microtask Crowdsourcing

Gadiraju, U., & Dietze, S. (2017). Improving learning through achievement priming in crowdsourced information finding microtasks. In Proceedings of the Seventh International Learning Analytics & Knowledge Conference (pp. 105-114).

Improving Learning Through Achievement Priming in Crowdsourced Information Finding Microtasks 

Harrison, L., Skau, D., Franconeri, S., Lu, A., & Chang, R. (2013). Influencing visual judgment through affective priming. In Proceedings of the SIGCHI Conference on Human Factors in Computing Systems (pp. 2949-2958).

Influencing Visual Judgment through Affective Priming

Types of Affective Primes in Microtask Crowdsourcing

- Affective priming with positive stimuli leads to increased creativity in microtask performance
- Affective priming with positive stimuli leads to increased accuracy

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