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Question 1

What is the basic procedure for ALL the studies?

Answer 1

1. Standard visual preference technique
2. Infant seated on parent’s lap; parent wore occluded glasses.
3. A light and a buzzing noise
4. A trial began when the infant first looked at one of the slides
   When the infant looked at the center of the screen, the next pair of slides was displayed.
   Each trial lasted for 10 s.
   Screen brightness consistent throughout

Question 2

What is the Presentation order for Study 1?

Answer 2

1. The stimuli were presented in two sets of 16 slides

2.Each set divided into 8 trial blocks of 2 slides each
Control for infant side biases

3.Slides paired so that infants viewed only pairs of women or pairs of men

Question 3

What are the TWO Conditions for Study 1?

Answer 3

1. Alternating condition, the infants observed alternating pairs of males and females.
2. Grouped condition, infants saw all the women’s slides together & all the men’s slides together

Question 4

How did they make the picture order fair?

Answer 4

Order of set presentation, order of slide pair presentation within sets & order of slide pairing across subjects were randomized so that a particular slide of an attractive face could be paired with any slide of an unattractive face of the same sex
randomized

Question 5

How did they lessen fatigue?

Answer 5

Infants given 5-10-min break after 8 trials to lessen fatigue