Adaptation of saccadic eye movements is necessary so that saccade accuracy can be maintained throughout life despite the changes caused by development, aging and trauma. The long-term objective of this grant is to study the possible role of the oculomotor vermis (OMV) of the cerebellum in the adaptation process. We will approach this objective with 3 sets of experiments. In the first, we will inactivate the OMV pharmacologically and determine the deficit in the behavioral adaptation of saccades to an intra-saccadic target step, which causes saccades to appear inaccurate. In the second, we will examine the behavior of simple spike activity in the Purkinje cells of the oculomotor vermis to determine how it changes during this behavioral adaptation. Finally, we will activate the putative error signal pathway that drives adaptation by stimulating the superior colliculus, which is the likely source of the error-related climbing fiber activity to the OMV. Because of the similarities of simian and human saccadic eye movement behavior, the results of this project should have considerable relevance in the diagnosis, treatment and rehabilitation of patients with saccadic eye movement disorders.

Public Health Relevance

This proposal studies the brain mechanisms of saccadic eye movement adaptation. The results of this project are relevance in the diagnostics, treatment and rehabilitation of patients with saccadic eye movement disorders.

Agency
National Institute of Health (NIH)
Institute
National Eye Institute (NEI)
Type
Research Project (R01)
Project #
5R01EY019258-05
Application #
8443421
Study Section
Sensorimotor Integration Study Section (SMI)
Program Officer
Araj, Houmam H
Project Start
2009-04-01
Project End
2014-03-31
Budget Start
2013-04-01
Budget End
2014-03-31
Support Year
5
Fiscal Year
2013
Total Cost
$395,010
Indirect Cost
$169,290
Name
University of Washington
Department
Physiology
Type
Schools of Medicine
DUNS #
605799469
City
Seattle
State
WA
Country
United States
Zip Code
98195
Kojima, Yoshiko; Robinson, Farrel R; Soetedjo, Robijanto (2014) Cerebellar fastigial nucleus influence on ipsilateral abducens activity during saccades. J Neurophysiol 111:1553-63
Kojima, Yoshiko; Soetedjo, Robijanto; Fuchs, Albert F (2011) Effect of inactivation and disinhibition of the oculomotor vermis on saccade adaptation. Brain Res 1401:30-9
Kojima, Yoshiko; Soetedjo, Robijanto; Fuchs, Albert F (2010) Changes in simple spike activity of some Purkinje cells in the oculomotor vermis during saccade adaptation are appropriate to participate in motor learning. J Neurosci 30:3715-27
Kojima, Yoshiko; Soetedjo, Robijanto; Fuchs, Albert F (2010) Effects of GABA agonist and antagonist injections into the oculomotor vermis on horizontal saccades. Brain Res 1366:93-100
Soetedjo, Robijanto; Fuchs, Albert F; Kojima, Yoshiko (2009) Subthreshold activation of the superior colliculus drives saccade motor learning. J Neurosci 29:15213-22