Misreach

When neurologically healthy individuals are first exposed to displacing prisms, they typically misreach in the direction of the visual displacement when pointing towards a visual target.

Classically, patients with visuomotor apraxia misreach for objects in the visual field contralateral to the lesion (Rondot et al 1977).

Monkeys also show paucity of spontaneous movements in limbs contralateral to a lesion, misreach for targets and have difficulty in grasping.

Now the subject's misreach cannot be corrected if you don't give him information about his hand position .

The number of trials to criterion, the total distance of misreach, and the distance of the initial misreach after donning the prism goggles were measured.

The extent of a misreach could be determined from a scale located on the back of the apparatus, invisible to the subject, and the subject's accuracy was noted after each attempt.