Intrathecal use of baclofen pump affects duration of Cortical Silent Period in patients with sever spasticity. Baclofen does not affect the cutaneous SP, but prolongs the cortical SP Stetkarova I and M Kofler, 2013 (here).
To better understanding of intrathecal versus epidural administration we use the image below.
From Mayfield Clinic "Intrathecal drug pump"
