Abstract
The guinea-pig is an attractive model for investigating gaze stabilization because it is suitable for in vitro and in vivo studies. However, few data are available on its oculomotor performance. We therefore investigated spontaneous eye movements, horizontal vestibulo-ocular (HVOR) and vestibulo-collic reflexes (HVCR) in the alert head-fixed guinea-pig using the magnetic search coil method. First the characteristics of the spontaneous saccades in the light were analysed. They occurred with a mean frequency of 4.6/min and with a mean amplitude and duration of 7.41±3.57 deg and 30.9±9.5 ms, respectively (n = 340). Saccadic duration and velocity were linearly related to the amplitude of the eye movement. The HVOR was studied in response to sinusoidal rotations (0.01 Hz to 2 Hz, peak head velocity of 40 deg/s) in the dark. Vestibular responses were linear at 0.5 and 0.05 Hz for peak head velocities between 40 and 80 deg/s. As in other species, the gain increased and the phase lead decreased with increasing frequencies. The number of fast phases per second increased with peak head velocity and with increasing frequencies from 0.01 to 0.5 Hz, with a plateau between 0.2 and 0.5 Hz. The HVOR time constant, when measured in response to velocity steps, was 7.0±1.5 s and the latency of the vestibular responses averaged 21±4 ms. Finally, the HVCR was assessed in unrestrained guinea-pigs subjected to horizontal sinusoidal rotation in the frequency range of 0.05–2 Hz. Exploratory behaviour was prevalent and there were few head stabilization episodes. However, when it occurred, the HVCR gain and phase were relatively flat over a frequency range from 0.1 to 2 Hz, reaching values close to 0.9 and 12 deg, respectively. In summary, the saccadic eye movements, the HVOR and the HVCR in the guinea-pig appear to be sufficiently similar to those of other vertebrates, including humans, to allow this species to be used as a model for studies of new pharmacological agents for vestibular disorders and post-lesional plasticity.
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Escudero, M., de Waele, C., Vibert, N. et al. Saccadic eye movements and the horizontal vestibulo-ocular and vestibulo-collic reflexes in the intact guinea-pig. Exp Brain Res 97, 254–262 (1993). https://doi.org/10.1007/BF00228694
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DOI: https://doi.org/10.1007/BF00228694