Can I apply with a Bachelor of Arts (B.A.) degree or a Bachelor of Science (B.Sc.) degree is compulsory?
As long as prerequisites according to the Access Charter (Zulassungsordnung) are met, it does not matter if it is a BA or a BSc degree:
"Admission to the master’s degree program requires a higher education degree (bachelor degree) or professional qualification from a German or comparable non-German institution with at least 180 credits completed in the following areas: psychology, neuroscience, cognitive science, data science, mathematics, physics, biology, or computer science. The completion of a qualifying examination in the field of medicine can also fulfill this requirement. "
Please find the Access Charter on the pages of the examination office.