Assuming that the plexus was not a “floater” artifact, we would funher assume that the cyst had some cerebral ependymal component, as Rand et a1 first described in “Intracranial Telencephalic Meningoencephaloceles” (J Neuropathol Exp Neurol 23:293-305, 1964) and as we recently reviewed in the differential diagnosis of congenital arachnoid cysts (‘Congenital arachnoid’ cysts and their differential diagnosis, in Vinken PJ, Bruyn GW (eds): Handbook of Clinical Neurology, vol 31, pp 75-135, 1977).
Is the Right Hemisphere Silent? Malvin Cole, MD
LeDoux et al refer to the right hemisphere as the “mute half-brain’’ and “silent inhabitant of the right side of the cranium” [5]. Setting aside the dextral patients with right hemisphere language dominance, although these patients may have theoreacal implications [ 11, not all authors agree that the right half-brain in a dextral patient is always or From the Department of Neurology, Memorial Hospital of Nat-
rona County, Casper, WY 82601.
5 6 4 Annals of Neurology
Vol 3 No 6 June 1978
even usually completely mute. Jackson, for example, considered that both hemispheres are involved in speech but that the left one is the “leading” hemisphere for voluntary or propositional speech, whereas the right one subserves automatic ejaculatory speech [3]. Gowers and others discussed patients who, after a left hemisphere lesion, became aphasic and reacquired speech only to lose it after a fresh right hemisphere lesion [Z, 41. Many contemporary papers raise the question of language function in the right hemisphere. I t would seem that the right half-brain is subservient to the left in language but may, in its own way and at certain times, have its own say.
References 1. Ettlinger G, Jackson CV, Zangwill OL: Dysphasia following right temporal lobectomy in a right handed man. J Neurol Neurosurg Psychiatry 18:214-217, 1955 2. Gowers W R A Manual of Diseases of the Nervous System. London, J & A Churchill, 1888, vol2, p 103 3. Jackson JH: Notes on the Physiology and Pathology of Language, in Taylor J (ed): Selected Writings of John Hughlings Jackson. New York, Basic Books, 1958, vol 2, p 125 4. Kinsbourne M: The minor cerebral hemisphere as a source of aphasic speech. Arch Neurol25:302-306, 1971 5 . LeDoux JE, Wilson DH, Gazzaniga MS: A divided mind: observations on the conscious properties of the separated hemispheres. Ann Neurol 2:417-420, 1977
Is the Right Hemisphere Silent? Malvin Cole, MD
LeDoux et al refer to the right hemisphere as the “mute half-brain’’ and “silent inhabitant of the right side of the cranium” [5]. Setting aside the dextral patients with right hemisphere language dominance, although these patients may have theoreacal implications [ 11, not all authors agree that the right half-brain in a dextral patient is always or From the Department of Neurology, Memorial Hospital of Nat-
rona County, Casper, WY 82601.
5 6 4 Annals of Neurology
Vol 3 No 6 June 1978
even usually completely mute. Jackson, for example, considered that both hemispheres are involved in speech but that the left one is the “leading” hemisphere for voluntary or propositional speech, whereas the right one subserves automatic ejaculatory speech [3]. Gowers and others discussed patients who, after a left hemisphere lesion, became aphasic and reacquired speech only to lose it after a fresh right hemisphere lesion [Z, 41. Many contemporary papers raise the question of language function in the right hemisphere. I t would seem that the right half-brain is subservient to the left in language but may, in its own way and at certain times, have its own say.
References 1. Ettlinger G, Jackson CV, Zangwill OL: Dysphasia following right temporal lobectomy in a right handed man. J Neurol Neurosurg Psychiatry 18:214-217, 1955 2. Gowers W R A Manual of Diseases of the Nervous System. London, J & A Churchill, 1888, vol2, p 103 3. Jackson JH: Notes on the Physiology and Pathology of Language, in Taylor J (ed): Selected Writings of John Hughlings Jackson. New York, Basic Books, 1958, vol 2, p 125 4. Kinsbourne M: The minor cerebral hemisphere as a source of aphasic speech. Arch Neurol25:302-306, 1971 5 . LeDoux JE, Wilson DH, Gazzaniga MS: A divided mind: observations on the conscious properties of the separated hemispheres. Ann Neurol 2:417-420, 1977
