Abstract
Miniature yoked eye movements, fixational saccades, are critical to counteract visual fading. Fixational saccades are followed by a return saccades forming squarewaves. Present in healthy states, squarewaves, if too many or too big, affect visual stability. Parkinson’s disease (PD), where visual deficits are not uncommon, is associated with the squarewaves that are excessive in number or size. Our working hypothesis is that the basal ganglia are at the epicenter of the abnormal fixational saccades and squarewaves in PD; the effects are manifested through their connections to the superior colliculus (affecting saccade frequency and amplitude) and the cerebellum (affecting velocity and amplitude). We predict that the subthalamic deep brain stimulation (DBS) variably affects the amplitude, frequency, and velocity of fixational saccade and that the effect depends on the electrode’s proximity or the volume of activated tissue in the subthalamic nucleus’ connections with the superior colliculus or the cerebellum. We found that DBS modulated saccade amplitude, frequency, and velocity in 11 PD patients. Although all three parameters were affected, the extent of the effects varied amongst subjects. The modulation was dependent upon the location and size of the electrically activated volume of the subthalamic region.
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Beylergil, S.B., Murray, J., Noecker, A.M. et al. Effects of subthalamic deep brain stimulation on fixational eye movements in Parkinson’s disease. J Comput Neurosci 49, 345–356 (2021). https://doi.org/10.1007/s10827-020-00773-2
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DOI: https://doi.org/10.1007/s10827-020-00773-2