Figure 3. Heaviness ratings (A) and peak arm acceleration (B) for the five objects tested in 0.16 g, 0.38 g, and one g (mean ± SE of two trials with six subjects).

The mass estimates and arm accelerations were significantly different across gravity levels. Compared to the reference cube, the heaviness ratings were significantly smaller for the taller and the lighter objects. However, the arm acceleration was not different between the five objects.