Cortical control of optokinetic nystagmus in humans: a positron emission tomography study

被引：0

作者：

Gaspare Galati

Sabina Pappata

Patrizia Pantano

Gian Luigi Lenzi

Yves Samson

Luigi Pizzamiglio

机构：

[1] SHFJ,

[2] Service Hospitalier Frédéric Joliot,undefined

[3] DSV/DRM,undefined

[4] Orsay,undefined

[5] France,undefined

[6] INSERM U-334,undefined

[7] CEA,undefined

[8] Service Hospitalier Frédéric Joliot,undefined

[9] DSV/DRM,undefined

[10] Orsay,undefined

[11] France,undefined

[12] Centro Ricerche Neuropsicologia,undefined

[13] IRCCS S. Lucia,undefined

[14] via Ardeatina 306,undefined

[15] I-00179 Rome,undefined

[16] Italy e-mail: galati@uniroma1.it Tel.: +39-06-51501-364,undefined

[17] Fax: +39-06-51501-366,undefined

[18] Department of Psychology,undefined

[19] University ”La Sapienza”,undefined

[20] Rome,undefined

[21] Italy,undefined

[22] Department of Neurological Sciences,undefined

[23] University ”La Sapienza”,undefined

[24] Rome,undefined

[25] Italy,undefined

[26] Urgences cérébrovasculaires,undefined

[27] Hôpital ”La Salpétrière”,undefined

[28] Paris,undefined

[29] France,undefined

来源：

Experimental Brain Research | 1999年 / 126卷

关键词：

Key words Optokinetic nystagmus; Positron emission tomography; Visual motion; Area V5; Human;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Positron emission tomography (PET) was used to address the issue of physiological changes in the cerebral cortex associated to optokinetic nystagmus (OKN) in humans. We studied regional cerebral blood flow in eight volunteers during reflexive induction of OKN by a pattern of dots moving unidirectionally (toward the left side). We used two control conditions, with subjects passively viewing either stationary or incoherently moving dots. This paradigm was designed in order to differentiate the OKN-related activations from blood flow changes related to visual motion. When compared with the stationary condition, OKN activated a set of occipital areas known to be sensitive to visual motion. Bilateral activation was found in the striate cortex (V1) and the parieto-occipital fissure, while area V5, the intraparietal sulcus, and the pulvinar were activated only in the left hemisphere. When compared with incoherent motion, OKN activated the V1 and the parieto-occipital fissure bilaterally and the right lingual gyrus, while a signal decrease was observed in the V5 region in both hemispheres. No significant signal changes were found in areas implicated in saccades or in processing vestibular information. These results indicate that processing of OKN-related information is associated with neural activity in a specific set of visual motion areas and suggest that this network can be asymmetrically activated by a strictly unidirectional stimulation. Results are also discussed in terms of the specific kinds of OKN-related information processing subserved by each area in this network.

引用

页码：149 / 159

页数：10