منابع مشابه
Eye movement control in voluntary nystagmus.
Raehlmann, in 1878, and shortly thereaf ter Campbell, in 1882, described voluntary nystagmus. This phenomenon has also been called voluntary ocular fibrillation or ophthalmodenesis. It is a rapid, pendular, horizontal nystagmus initiated and main tained on a voluntary basis." Typically, an individual without previous eye disease describes the ability to "wobble" or "jiggle" his eyeballs at wi...
متن کاملVoluntary nystagmus associated with accommodation spasms.
BACKGROUND Voluntary nystagmus has been recognized as a pendular, rapid, conjugate, primarily horizontal, benign eye movement initiated and maintained by voluntary effort. CASE A 10-year-old Japanese girl presented with voluntary nystagmus associated with accommodation spasms. Her chief complaints, intermittent blurred vision, headache, and soreness of the eyes, were thought to be related to ...
متن کاملIncidence and characteristics of voluntary nystagmus.
A survey of a college age population revealed that 8% could produce voluntary nystagmus. Seventy-nine per cent of this sample had relatives who could also produce it. A systematic investigation of the characteristics of voluntary nystagmus under a number of stimulus conditions showed that it resembles pendular nystagmus in waveform, and certain ocular oscillations, such as ocular flutter and op...
متن کاملLateral asymmetry of voluntary attention orienting.
We recently demonstrated that automatic attention favors the right side of space and, in the present study, we investigated whether voluntary attention also favors this side. Six reaction time experiments were conducted. In each experiment, 12 new 18-25-year-old male right-handed individuals were tested. In Experiments 1, 2, 3 (a, b) and 4 (a, b), tasks with increasing attentional demands were ...
متن کاملDirection-fixed paroxysmal nystagmus lateral canal benign paroxysmal positioning vertigo (BPPV): another form of lateral canalolithiasis
Benign paroxysmal positioning vertigo (BPPV) is the most frequent vertiginous syndrome. It is caused either by free-floating otoliths in the semicircular canals (canalolithiasis) or by otoconial debris adhering to a canal cupula (cupulolithiasis). The posterior canal is the most frequently involved (80%), while the lateral canal is involved less frequently (15%), and the rarest conditions are a...
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ژورنال
عنوان ژورنال: Journal of the American Medical Association
سال: 1899
ISSN: 0002-9955
DOI: 10.1001/jama.1899.92450360033001q