Visually-evoked rooting

The group of reflexes collectively known as "primitive reflexes", reviewed by Schott and Rossor,2 include the grasp, snout, palmomental, and rooting reflexes. They are usually associated with neurodegenerative diseases causing dementia and, as the authors point out, loosely linked to frontal lobe pathology, but their exact physiological and anatomical substrates are poorly understood.
The well known tactile-evoked rooting reflex is the movement of both lips towards the examiner’s finger when stroking the lateral side of the upper lip. However, there has been very little written about the related phenomenon of visually-evoked rooting.