1,720,994 research outputs found
Tonic cervical influences on eye nystagmus following hemilabyrinthectomy: immediate and plastic effects.
No full textOrientation of the ocular responses in the vertical vestibulo-ocular reflex of the rabbit
No full textNeck Proprioception Shapes Body Orientation and Perception of Motion
No full textThis review article deals with some effects of neck muscle proprioception on human balance, gait trajectory, subjective straight-ahead (SSA), and self-motion perception. These effects are easily observed during neck muscle vibration, a strong stimulus for the spindle primary afferent fibers. We first remind the early findings on human balance, gait trajectory, SSA, induced by limb, and neck muscle vibration. Then, more recent findings on self-motion perception of vestibular origin are described.The use of a vestibular asymmetric yaw-rotation stimulus for emphasizing the proprioceptive modulation of motion perception from the neck is mentioned. In addition, an attempt has been made to conjointly discuss the effects of unilateral neck proprioception on motion perception, SSA, and walking trajectory. Neck vibration also induces persistent aftereffects on the SSA and on self-motion perception of vestibular origin. These perceptive effects depend on intensity, duration, side of the conditioning vibratory stimulation, and on muscle status. These effects can be maintained for hours when prolonged high-frequency vibration is superimposed on muscle contraction. Overall, this brief outline emphasizes the contribution of neck muscle inflow to the construction and fine-tuning of perception of body orientation and motion. Furthermore, it indicates that tonic neck-proprioceptive input may induce persistent influences on the subject’s mental representation of space. These plastic changes might adapt motion sensitiveness to lasting or permanent head positional or motor changes
Asymmetries in the vertical vestibulo-collic reflex
No full textThe results support the hypothesis that vestibulo-ocular reflez and vestibulo-collic reflex share a common circuitry having an intrinsic asymmetry aimed at counterbalancing the gravity load during upward head displacements. This asymmetry is present in the vestibulo-collic reflex while it is suppressed by the macular input in the vestibulo-ocular reflex
Predictive models of the auditory steady state (40 Hz) response
No full textThe findings support the hypothesis that besides a phenomenon of suprimposition of the middlle latency responses, other mechanisms related to the resonant frequency of the activated system play a role in the generation of steady-state responses
Potenziali evocati uditivi di stato stazionario (40-Hz response): modelli di generazione
No full textAnticompensatory fast eye movements in the horizontal and vertical vestibulo-ocular reflexes
No full textThe otolithic influence on the anticompensatory fast phases causes gaze stability to be higher in the vertical than in the horizontal plane. The high density of ganglion cells in the horizontal visual streak should be taken into account to explain the enhancement of gaze stability in the vertical plane
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