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. 2016 Jun 3;7:797. doi: 10.3389/fpsyg.2016.00797

FIGURE 1.

FIGURE 1

(A) Adjustable slope apparatus used in previous work. (B) Adjustable drop-off apparatus. Infants began in a prone or upright position on the starting platform. An experimenter followed alongside infants to ensure their safety. The landing platform adjusted in 1-cm increments from 0 to 90 cm. In blocked test trials, mothers encouraged and discouraged infants’ descent; they stood at the landing platform.