Imagination can overcome reason when a person is affected by mental instability or fear. Being mentally unstable can trigger imagination and hallucinations which may overcome reasoning and logic.

What causes imagination to overcome?

Imagination overcomes reason by using imagination as a coping mechanism for the unknown, and when fear of the truth is stronger than that of reason or rationale. First off, imagination overcomes reason by being used by the human brain to cope with the unknown.

How does imagination overcome reason in the Raven?

Imagination can overcome reason, even if the encounter could not be possible. For example, in the poem “The Raven” by Edgar Allan Poe, Poe says,“... ... The narrator is tortured by the raven because he keeps asking questions about his love Lenore and the afterlife but the raven doesn't specifically answer his questions.