patellar reflex

On this view, empathy is the emotional equivalent of a patellar reflex: while observing someone’s emotions, you can’t help but take those emotions on yourself.

Facilitation of the patellar reflex or "knee jerk".

The most important of these—the centres for the rectal, the vesical, and the patellar reflexes—are situated in the lumbar enlargement.

The left plantar reflex was absent, the right slight, the left patellar reflex was abnormally brisk.

While the reflexes were being tested he volunteered the information that his left patellar reflex was very much stronger than the right.