There are multiple definitions:

1. ultimatum game(English)

   • a neuroeconomics paradigm in which participants are forced to choose between monetary reward and punishing an opponent's unfairness
   • BZSG, RTPJ, tDCS
   • Psychology, Decision making, Social aspects, Financial issues, Paradigm or theory
   • https://doi.org…nins.2018.00258

2. unilateral group(English)

   • FDO, BG, CP, MFT
   • Gait/walking, Pediatrics, Orthopedics
   • https://doi.org…000000000000467