Abstract：
:The superior branch of the vestibular nerve containing peripheral axons of primary afferents originating in the lateral and anterior semicircular canals was cut bilaterally in three monkeys (vestibular neurectomy). Vertical and horizontal components of eye position were monitored by electro-oculography (EOG) during different stimulus and behavioral paradigms. Postoperatively, monkeys were unable to hold their eyes in eccentric lateral positions in complete darkness. The eyes drifted slowly back to the primary position where eye drift was minimal (null-zone). After vestibular neurectomy the time constant of the eye position integrator in darkness was 4-8 s. Constant velocity optokinetic stimuli produced peak velocities of horizontal OKN that were similar to those before operation. Consistent optokinetic after-responses could not be observed after neurectomy for stimulus durations of less than 60 s. However, with stimulus periods greater than 60-120 s a drift near the primary position of the eyes appeared in darkness which had the same direction as the slow phases of the preceding OKN. Drift velocity was too high to be explained by drift due to the imperfect eye position integrator alone. We assume that drift after prolonged optokinetic stimulation is a combination of an after-response similar as it can be observed after smooth pursuit and of drift due to an imperfect eye position integrator. Secondary optokinetic after-nystagmus was not observed after neurectomy.
journal_name
Exp Brain Resjournal_title
Experimental brain researchauthors
Waespe W,Wolfensberger Mdoi
10.1007/BF00235920subject
Has Abstractpub_date
1985-01-01 00:00:00pages
263-9issue
2eissn
0014-4819issn
1432-1106journal_volume
60pub_type
杂志文章abstract：:Previously, we observed changes in the scale, rotation, and location of drawn shapes when subjects simultaneously performed a secondary task, but not in the shape or proportion of the drawing. We suggested the secondary task impacted motor planning and execution or proprioception of the primary task. To isolate for pr...
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