Used in case grammar, it is the thing that experiences the effect of the action, state or process described in a sentence.See agent- instrumental.

EXPERIENCER: "The experiencer is the thing feeling or being affected by the experience."
Cite this page: N., Pam M.S., "EXPERIENCER," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/experiencer/ (accessed April 3, 2020).