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Definition
| represent the fastest eye movements in humans and primates which allow rapid arefixation of objects. They exist because of the presence of the fovea. |
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Term
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Definition
| 1. Volitional Saccades are elective saccades made as part of a purposeful behavior, such as: 2. Predictive (anticipatory) saccades 3.Remembered target saccades 4.Antisaccades 5. Command saccades 6. Express Saccades |
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Term
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Definition
| are elective saccades made as part of a purposeful behavior |
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| Voltuional saccades examples |
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Definition
| predictive (anticipatory) saccades, Remembered target saccades, Anntisaccades, Command Saccades, Express Saccades, |
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Definition
| are generated to nevel stimuli that occur unexpectedly |
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Definition
| occur randomly and unrelated to any behavioral task |
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Definition
| of Optokinetic Nystagmus and VOR |
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Term
| How is a saccade characterize |
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Definition
| a saccadic response is characterized by the shape of its trajectory to include its: Latency, Amplitude, Peak Velocity, Duration |
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Definition
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Term
| Time of Efferent and Afferent Delay for saccade |
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Definition
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Term
| The higher center processing time including computational delay |
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Definition
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Term
| Latency increases slightly with |
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Definition
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Term
| Is saccade a sampled data (bang bang) system or continuous? Explain. |
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Definition
| Sampled data system b/c the not matter how long the stimulus was there the latency for that position of the eye is unchanged (200ms) p.44 |
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Term
| Position error of less than |
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Definition
| 0.5 degrees (later revised to 0.3 degrees) are generally not corrected since they lie within an effective foveal “dead zone” over which small position errors are tolerated |
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Term
| The skewness of a saccade defines |
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Definition
| the asymmetry of the trajectory. |
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Term
| The skewness of a saccade is determined as |
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Definition
| (time to reach peak velocity/ total duration of saccade), for small saccades skewness is ~0.5, for large saccades ~0.2 |
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Term
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Definition
| anti-saccades, saccades made to remembered target, in fatigue or decreased vigilance. |
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Term
| Effects of blinks on saccades: |
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Definition
| 1 . Peak velocities are smaller for similar size saccades when the subject blinks during saccades 2. Dynamic overshoots (DO) occur more frequently with blinks |
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Term
| Promptness of a saccade is measured how |
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Definition
| This is the reciprocal of saccadic latency: 1/(Latency) |
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Term
| The variability in saccade initiation time reflects |
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Definition
| the decision-making time plus neurological control processes. |
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Term
| Peak Velocity of Saccade is related to |
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Definition
| its amplitude as determined on the Main Sequence |
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Term
| Main Sequence Relationship |
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Definition
| the relationship quantified between saccades of various amplitudes and their respective peak velocities |
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Term
| The main sequence formula is |
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Definition
| ? (peak) = 684(1- e-0.1??) |
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