Why the first and last lines of an ad are the ones you keep

A cereal brand tested ad recall twenty-four hours after exposure. Viewers accurately quoted the opening tagline seventy-one percent of the time and the closing call-to-action sixty-three percent of the time. Middle claims — price, nutrition, flavour — were recalled by fewer than nineteen percent. The ad had five lines; only two survived the night.

What everyone sees

Viewers believe they remember the lines because they were the most interesting or persuasive. They do not suspect that position in the sequence determined memorability more than content quality. The opening felt important because it was first; the close felt important because it was last — but both felt important for their content, not their position.

What is actually happening

Murdock’s serial-position curve shows that the first items in a list benefit from primacy (deeper rehearsal in long-term memory) and the last items benefit from recency (still active in working memory at the time of retrieval). Glanzer and Cunitz confirmed that a brief delay eliminates recency but not primacy, meaning the opening line is the most durable asset. Advertisers who place their strongest claim in the middle are effectively hiding it.

Why it stays hidden

The effect hides because both the opening and closing lines feel inherently special. The viewer attributes their memorability to wit, emotion, or relevance rather than to their ordinal position. The middle lines are not forgotten because they are weak — they are forgotten because the encoding system deprioritises everything that is not at the boundary.