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. Author manuscript; available in PMC: 2020 Sep 1.
Published in final edited form as: Dev Psychol. 2019 Sep;55(9):1889–1907. doi: 10.1037/dev0000675

Figure 3.

Figure 3.

Apparatuses used to test infants’ reactions to heights. (A) Standard visual cliff. The entire apparatus is covered in safety glass so the drop-off is only illusory. On the “deep” side, the checkerboard-patterned floor surface on the deep side is 102 cm below the centerboard; and the surface on the “shallow” side, it is 3 cm below the centerboard. (B) Actual cliff. Height of the drop-off adjusts from 0 to 90 cm in 1-cm increments. (C) Adjustable slope apparatus. Steepness slant adjusts from 0° to 90° in 2° increments. (D) Bridge apparatus. Bridge width adjusts from 2 to 60 cm in 2-cm increments. (E) Adjustable opening ledge apparatus. In the falling condition, infants walked along a ledge between a moving wall and a precipice. Ledge width adjusts from 0 to 70 cm in 1-cm increments. (F) Adjustable gap apparatus. Gap width adjusts from 0 to 90 cm in 2-cm increments.