The present study examined directional error shifts (assimilation or contrast) in the reproduction of a criterion pressure control task (2kg) following either 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5kg and a noninterpolated pressure control task. Eight independent groups of subjects (N=120) were tested. The results showed that when an interpolated forces was greater in magnitude than the criterion one, the subjects produced a significantly smaller magnitude of force than the criterion one. These results supported the contrast effect and not the assimilation effect
