Using the preference method, Lisa Serbin, Diane Poulin-Dubois, and Julie Eichstedt found that 24-month-old toddlers looked longest at the following type of event:

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Research by Lisa Serbin, Diane Poulin-Dubois, and Julie Eichstedt using the preference method found that 24-month-old toddlers looked longest at a male putting on lipstick, indicating an early understanding of gender norms and a heightened interest in gender-nonconforming behavior.

Using the Preference Method, Lisa Serbin, Diane Poulin-Dubois, and Julie