How is the disc parameter used with the cumulative family in brms?

When fitting an ordinal model with family = cumulative in brms, what parameters does the disc scale? For example, assuming disc is \alpha and \tau are the thresholds, which describes how \alpha enters the model?

  1. \alpha(\tau + \eta)
  2. \tau + \alpha(\eta)

Found the answer here. It’s option 1.

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