Design of Experiment 1.

<p><i>Note</i>: A-D indicate target faces. 1–4 refer to comparator faces (<i>e.g.</i>, C1-C4 in indicate same sex comparator faces to target C, while X1 to X4 illustrate different sex comparator faces to target D). Exposure was repeated four times as indicated by × 4. fp denotes fixation points which were represented by a cross on screen. 5–8 in the morph array indicate previously unseen faces used as foils (<i>e.g.</i>, A5 to A8 are morphed foils for target A). AH-DH represents target individuals with an expression change in the non-morph array. 9–12 represent unseen foils present in the non-morph array (<i>e.g.</i>, BH9 to BH12 are non-morphed foils for target B).</p><p>Design of Experiment 1.