The cheerleader effect describes how an individual is perceived as more attractive when seen within a group than in isolation. Popularised by How I Met Your Mother, this robust effect shows an average attractiveness increase of 1.5%–2.0% and has been replicated across various cultures, including collectivist societies like China.Proposed mechanisms include:•Automatic ensemble averaging, where the brain averages group attractiveness, making individuals seem more appealing•A change in evaluation mode, where judgment shifts from internal standards to comparison with flanking faces, causing the effect even without direct attractiveness contrast, especially for less attractive individuals•The effect is moderated by group composition, being more evident with highly attractive individuals present. It generally boosts female attractiveness and partner value.•It's robust to spatial arrangement and presentation time•However, evidence suggests hierarchical encoding is not the sole cause, as the effect occurs even with non-human stimuli or identical distractorsThe Entire Behavioural Science Reading List on Amazon

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