Experiencer
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Experiencer is a specific semantic (or thematic) role of the person(s) whose mental faculties are involved in the psychological state denoted by an emotive predicate. It denotes a participant in an experiential situation that undergoes an experience.
Examples
the subject of fear, love, hear, the object of please
in both John is amused and This is amusing (to) John the expression John is associated with the Experiencer role.
Link
Utrecht Lexicon of Linguistics