Effect of vestibular deafferentation upon positional nystagmus in the squirrel monkey.
Seventeen of eighteen squirrel monkeys, under a restrained condition, showed positional nystagmus in different body positions. Good repeatability and consistency of the nystagmus were found, especially at the left-lateral, right-lateral, and head-hanging positions. Positional nystagmus was not observed after the subject underwent bilateral labyrinthectomy. However, one subject in which part of the crista ampullaris posterior remained, continuously showed a positional nystagmus. Therefore, the existence of a minimal vestibular imput from the crista ampullaris could provoke the nystagmus. Some changes occurred in positional nystagmus after bilateral macular ablation; however, the nystagmus did not completely disappear. Even though imput from the crista ampullaris is essential to provoke positional nystagmus in squirrel monkeys, the positional nystagmus probably results from a centralEAHCA, the court does not reach the § 504 issue.
The parties have entered into a comprehensive Stipulation of Uncontested Facts which is attached as Appendix A.
The case arises from the attempted expulsion, in February and March, 1983, of Jerry F. Malone, a fourteen year old handicapped child, because of charges against him relating to the distribution of drugs. Jerry is handicapped because he suffers from a learning disability which, while leaving him intellectually unimpaired,[1] manifests itself as a severe difficulty in the comprehension and analysis of what he sees, reads and is told, and difficulty in the organization of spoken and written language. He is enrolled in the Prince William County School system in a self-contained learning disability class under Individual Educational Plans (I.E.P.'s) which all parties agree