Abstract
Citizen science projects aim to democratize research by inviting broad public participation, yet sustaining engagement depends as much on community experience as on individual motivation. This paper examines how volunteers perceive the Zooniverse platform across dimensions of belonging, respect, diversity, and responsiveness, and how those perceptions shape patterns of participation. Drawing on survey responses (N = 6,030) and linked to contribution (N = 2,605) data across more than 100 projects, we quantify how perceptions mediate participation intensity in relation to socio-demographic factors. We demonstrate that volunteers with positive perceptions of community belonging, respect, and diversity contribute substantially more than peers with neutral or disagreeable views. These perception-contribution links are robust across demographics and extend beyond known participation gaps, providing actionable guidance for designing inclusive citizen science platforms.

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