How many letters does the top answer for “a mental image that is similar to a visual perception” have?

The most common answer is visualisation (13 letters).

Crossword clue: a mental image that is similar to a visual perception

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

visualisation 13 letters wn-def

a mental image that is similar to a visual perception

visualization 13 letters wn-def

a mental image that is similar to a visual perception