Related Experiment Videos
Voluntary saccadic eye movements in humans studied with a double-cue paradigm
B M Sheliga1, V J Brown, F A Miles
1Laboratory of Sensorimotor Research, National Eye Institute, National Institutes of Health, Building 49, Room 2A50, 49 Convent Drive, Bethesda, MD 20892, USA. bms@lsr.nei.nih.gov
Vision Research
|July 20, 2002
Summary
The double-cue (DC) paradigm allows study of voluntary saccades, similar to how the double-step paradigm studies reflexive saccades. Differences observed are due to target arrangement, not movement type.
Area of Science:
- Neuroscience
- Ophthalmology
- Cognitive Psychology
Background:
- The double-step paradigm is used to study reflexive saccades, where eye movements are triggered by target appearance.
- Voluntary saccades involve cognitive control over eye movements.
Purpose of the Study:
- To adapt the double-step paradigm for studying voluntary saccades using a novel double-cue (DC) paradigm.
- To investigate the factors influencing saccadic eye movement programming in both reflexive and voluntary conditions.
Main Methods:
- Subjects performed saccades to visual targets using a modified double-step paradigm (the DC paradigm).
- Targets were cued, with the cue potentially shifting to a different target before response.
- Saccadic eye movements were analyzed for features and timing.
Main Results:
- Saccadic eye movements in the DC paradigm shared features with the double-step paradigm.
- Apparent differences were attributed to spatio-temporal cue/target arrangements, not intrinsic movement differences.
- The foveal location of a second cue/target, acting as a distractor, could transiently delay saccades.
Conclusions:
- The DC paradigm is a viable tool for studying the programming of voluntary saccades.
- Retinal (foveal) location, not cognitive vs. reflexive nature, is critical for distraction effects on saccades.
- The findings suggest a unified mechanism for saccade programming, modulated by target salience and location.