Here, it is presented two ways of visual stimuli modification using virtual reality: Modification 1: Tremor amplification and Modification 2: Object size magnification. By defining an orientation matching task, in which a subject is asked to match the orientation of virtual forceps to a given reference orientation. During the tasks, the subjects were instructed to put their elbow and lower arm on a table. For each trial, the subjects were requested to hold the forceps with the reference angle shown in the virtual reality screens (i.e., hologram image) for 20 seconds. The hologram reference image was in the same position and orientation throughout the tasks (yaw = 90º).