As a clinical investigations of the interactions between the optokinetic and vestibular system, a pendular optokinetic nystagmus (P-OKN) test was carried out on 57 patients with central nervous system disorders and compared with the pendular rotation tests (VOR and VVOR tests) and OKN test by linear acceleration stimuli. Most cases of central nervous system disorders with decreased P-OKN gain showed diminution of OKN during linear acceleration. However, in several cases, normal P-OKN

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... by abnormal accelerated OKN findings were observed. We concluded that the difference between the P-OKN and the accelerated OKN tests may be associated with different alertness during the optokinetic stimuli, especially due to the short stimulation time and also the increased and decreased velocities respectively. The P-OKN test is a simple and useful short test for detecting the abnormal oculomotor system, and may become a good screening test for central nervous system disorders.