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the same images according to how each image made them feel, along a similar scale ranging from 0 (not alert at all) to and 100 (very alert).

We entered the pleasantness rating scores into a mixed-model ANOVA with target age and target race as within-participants factors and participant race as a between-participants factor (see Table 3). Overall, infant faces were rated as more pleasant than adult faces, F1,14 = 535.48, P 0.001, South Asian faces were rated as more pleasant than White faces, F1,14 = 9.81, P,0.007, and own-race faces were rated as more pleasant than other-race faces, F1,14 = 81.25, P,0.001. In addition, the preference for infant over and adult faces was greater for own-race than cross-race faces for White participants but not South Asian participants, F1,14 = 8.453, P = 0.011. Of most import for this study, infant faces were rated as significantly more pleasant than adult faces regardless of target race or participant race, all P,0.001.

Arousal ratings were subjected to the same analysis (Table 3). Overall, infant faces were rated as more arousing than adult faces,


= 985.27, P,0.001. All interactions were significant: Target

Race x Participant Race, F1,14

= 24.62 P,0.001; Target Age x


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PLoS ONE | www.plosone.org


Social Attention to Infants

Participant Race, F1,14 = 33.95, P,0.001; Target Age x Target Race, F1,14 = 41.01, P,0.001; and Target Age x Target Race x Participant Race, F1,14 = 50.59, P,0.001. Although both South Asian and White participants found White infant faces more arousing than South Asian infant faces, the pattern of data differed for adult faces: Both South Asian and White participants found other-race adult faces more arousing than own-race adult faces. Critical to the current experiment, infant faces were rated as significantly more arousing than adult faces, regardless of target race or participant race, all P,0.005.


Thanks to Anna Paling for all her excellent assistance and in particular, for the preliminary study.

Author Contributions

Conceived and designed the experiments: JH KQ SH. Performed the experiments: JH. Analyzed the data: JH. Contributed reagents/materials/ analysis tools: JH. Wrote the paper: JH KQ SH.

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September 2010 | Volume 5 | Issue 9 | e12509

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