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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Tan, J. Jones, R.D. Andreae, J.H. Davidson, P.R. Frampton, C.M. Sirisena, H.R. Anderson, T.J. |
| Copyright Year | 2003 |
| Description | Author affiliation: Christchurch Neurotechnology Res. Programme, New Zealand (Tan, J.; Jones, R.D.) |
| Abstract | It is generally considered-but unproven-that the oculomotor control system takes initial velocity immediately preceding saccades into account when planning and executing saccadic eye movements. This is probably so that degradation of vision during a saccade can be minimized by achieving an optimal velocity profile which balances conflicting requirements of getting to a target as quickly as possible while not overshooting or ringing once eye has reached its target. Simulations, based on a linear homeomorphic mechanical model of the eyeball and its musculature, showed that the peak velocity of a saccade is strongly dependent on the velocity of the eye just prior to the saccade. An experiment involving 4 normal adult subjects (3M/1F, 20-24 yr) was subsequently undertaken in which each subject was asked to visually track either a stationary or a sinusoidal target. At unexpected times during this smooth oculomotor pursuit, and while the subject's eyes were stationary or moving at various velocities up to /spl plusmn/40 /spl deg//s, the target switched to a step to induce a saccade. The target steps were in both the same and opposite directions to that of the pre-saccade smooth pursuit velocities. Results from this experiment showed that, for both forward and reverse saccades, an increase in initial velocity increases the peak velocity of same-size saccades. For forward saccades, the brain is only able to partially compensate for the initial velocity of the eye. In contrast, for reverse saccades, the brain over-compensates for the initial velocity. This is the first study to demonstrate experimentally that peak velocities during same-size saccades are dependent upon initial eye velocity. |
| Sponsorship | Whitaker Found |
| Starting Page | 1742 |
| Ending Page | 1745 |
| File Size | 260395 |
| Page Count | 4 |
| File Format | |
| ISBN | 0780377893 |
| ISSN | 1094687X |
| DOI | 10.1109/IEMBS.2003.1279740 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2003-09-17 |
| Publisher Place | Mexico |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Velocity control Control systems Brain modeling Mathematical model Physics Biomedical engineering Hospitals Neuroscience Nervous system Medical control systems |
| Content Type | Text |
| Resource Type | Article |
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