Yes. All participants who take a course in the B2 module during the winter semester are expected to earn one credit for participation in a psycholinguistic experiment as part of their active participation. No distinction is made between first-time and repeat participants.
At LingLabTU, both paid and credit studies are offered. If you have participated in a paid study, you will not receive credit. You can see how the participation is remunerated in the study overview as well as on the info pages of the individual studies.