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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 77 (1989), S. 531-540 
    ISSN: 1432-1106
    Keywords: Vestibulo-ocular reflex (VOR) ; Adaptation ; Flocculus ; Purkinje cell ; Plasticity ; Rabbit
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The responsiveness of floccular Purkinje cells to head oscillations was examined in alert pigmented rabbits subjected to adaptation of horizontal vestibulo-ocular reflex (HVOR) under three different combinations of turntable and screen oscillations. Purkinje cells involved in the HVOR control (H-zone cells) were identified by local stimulation effects that induced horizontal eye movements. In control states, simple spike discharages of H-zone cells were modulated predominantly out of phase with the velocity of sinusoidal turntable oscillation (0.1 Hz, 5° peak-to-peak). A sustained 180° outphase combination (5° turntable and 5° screen oscillation) was found to increase the average HVOR gain by 0.16, at which point the majority of H-zone cells increased the outphase simple spike modulation. A sustained inphase combination (5° turntable and 5° screen oscillation) decreased the average HVOR gain by 0.09, with the majority of H-zone cells decreasing the outphase simple spike modulation or becoming converted to the inphase modulation. With a vision-reversal combination (5° turntable and 10° screen oscillation), there was no change in the gain of the HVOR, but a moderate advancement in the phase. In this case, H-zone cells showed no appreciable changes in their simple spike modulation. Complex spike discharges of all H-zone cells tested were modulated in response to optokinetic stimuli involved in the combinations of turntable and screen oscillations. These results support the hypothesis that H-zone cells adaptively control HVOR dynamic characteristics through modification of mossy fiber responsiveness to head oscillation under influences of retinal error signals conveyed by climbing fiber afferents.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 73 (1988), S. 489-497 
    ISSN: 1432-1106
    Keywords: Optokinetic response (OKR) ; Adaptation ; Flocculus ; Purkinje cell ; Plasticity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Single unit spike activities of Purkinje cells in the cerebellar flocculus were examined during sustained horizontal sinusoidal oscillation (0.33 Hz, 2.5° peak-to-peak) of a striped screen around an alert pigmented rabbit. The floccular area specifically related to horizontal reflex eye movement (H-zone) was identified by means of local stimulation that induced abduction of the ipsilateral eye. In control states, simple spike discharge of most of the H-zone Purkinje cells was enhanced by backward screen movement and depressed by forward screen movement, while complex spike discharge was modulated reciprocally. After one-hour sustained oscillation of the screen, the gain of horizontal optokinetic eye movement response (HOKR) increased by 0.16 on average. Correspondingly, simple spike modulation in most of H-zone Purkinje cells tested significantly increased in amplitude, while complex spike modulation tended to decrease. No such systematic changes were observed in other Purkinje cells. These results are consistent with the hypothesis that the floccular H-zone Purkinje cells adaptively control the optokinetic eye movement through modification of the visual mossy fiber responsiveness under the influence of the retinal error signals conveyed by the visual climbing pathway.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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