The Primacy Effect

The Primacy Effect

The primacy effect is that what comes first counts for more. In impression formation the first traits you hear about someone set a direction, and later traits get read in that light rather than weighed on their own. In memory, the first items in a list are recalled better than those in the middle. Solomon Asch established the impression-formation version in 1946. The order effect is robust, and it has replicated in this century, though one of Asch's separate claims has not fared as well.

What it is

Asch's 1946 paper described one stranger to two groups using the same six traits in opposite orders, intelligent first or envious first, and the two descriptions diverged sharply. Nothing changed but the sequence. The first two or three words establish a frame, and the remainder are absorbed into it.

The replication record is good. Jesse Sullivan published a set of replications in Social Psychological and Personality Science in 2019 that reproduced the order effect. Sanne Nauts and colleagues replicated Asch's materials in Social Psychology in 2014 and reproduced the primacy pattern, while questioning a separate claim of Asch's, that warmth is the central trait around which impressions organise. Those are two different claims and only the first is what this page is about.

The memory version is older and separate. The serial position curve, in which items at the start and end of a list are recalled better than those in the middle, is a long-standing finding traced to Hermann Ebbinghaus. Richard Shotton's chapter draws advice from both mechanisms without choosing between them, and readers should notice that they are not the same finding and do not have the same evidence behind them.

In effect

The commercial application is straightforward and is where most people meet the idea. Two launch posts for the same new spirit list identical attributes; one opens with award-winning and closes with refreshing, the other runs the other way. The version that leads with the strongest claim gets the better rating, though every reader saw the same words.

Shotton ran a direct test of that. Five hundred consumers heard about a fictitious Black Sheep Vodka with the same attributes presented in opposite orders, and the positives-first version raised the rating by eleven per cent. The study is unpublished, which is a real limitation, and the fictitious brand is a genuine strength because it removes whatever the respondents already felt about a real product.

The same structure shows up in interviews, in the order of items on an agenda, and in which clause of a sentence a caveat lands in. Order is not neutral and it is nearly free to change.

What it does not say

It does not say later information is ignored. It says later information is interpreted in light of what came first, which is why the same six words produce two people.

It does not settle Asch's warmth-centrality claim. That is a separate claim from the same 1946 paper, and it was questioned by Nauts and colleagues in the course of replicating the order effect.

It does not merge with the serial position curve. Recall order in a word list and impression formation from a trait list are different findings with different literatures, and the popular treatment runs them together.

It does not carry the vodka figure as a published result. Shotton's test is a direct one and it is unpublished, and the eleven per cent should be read as an illustration rather than as an established quantity.

Sources

  1. Asch, S. E. (1946). "Forming impressions of personality." Journal of Abnormal and Social Psychology, 41, 258-290.
  2. Nauts, S., et al. (2014). Replication and review of Asch 1946. Social Psychology, 45(3). Reproduces the primacy pattern; questions the warmth-centrality claim.
  3. Sullivan, J. (2019). "The primacy effect in impression formation: some replications and extensions." Social Psychological and Personality Science.
  4. Shotton, R. The Choice Factory, bias 10, pp. 71 to 75. Own Black Sheep Vodka test, 500 consumers, unpublished, positives-first rating 11 per cent higher.
  5. Serial position curve credited by Shotton to Hermann Ebbinghaus. Not read here.