 They are normally present in infancy, however, and until about one year of age, leading to the hypothesis that they are primitive or archaic reflexes.Frontal release signs are seen in disorders that affect the frontal lobes, such as dementias, metabolic encephalopathies, closed head injuries, and hydrocephalus.All of these disorders produce diffuse cerebral damage, usually involving many areas and systems in addition to the frontal lobes and pyramidal system, so the frontal release signs are not sufficient for a diagnosis.