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Hi Jackie! Thanks for this question! PSP is associated with vertical (both up and down) gaze paresis, as well as an increased likelihood of falling backward.

CBGD is more marked by dystonia, apraxia, and rigidity. Oculomotor and gaze changes are possible with CBGD but are less typical.

This article is more detailed than you’ll need for NCS prep, but the background does a nice job of describing the expected presentation for PSP and CBGD: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6174492/

Hope this helps!