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Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
Published on: March 18, 2019
Microsaccadic modulation of response times in spatial attention tasks
Reinhold Kliegl1, Martin Rolfs, Jochen Laubrock
1University of Potsdam, Potsdam, Germany. kliegl@uni-potsdam.de
Psychological Research
|December 11, 2008
Summary
Microsaccades, small eye movements, significantly impact reaction times (RTs) in spatial attention tasks. Their orientation, especially the last one before a target, complexly interacts with cue validity, affecting attention shifts.
Area of Science:
- Cognitive Neuroscience
- Oculomotor Research
- Human Perception
Background:
- Covert attention shifts are typically inferred from reaction time (RT) differences in spatial cueing tasks.
- Existing methods often overlook the influence of microsaccades during the cue-target interval.
Purpose of the Study:
- To investigate the impact of microsaccade orientation on RTs in a spatial attention task.
- To examine how microsaccades interact with cue validity and target modality.
Main Methods:
- Analysis of microsaccade orientation effects on RTs across four cue-target conditions (visual/auditory cues and targets).
- Controlled for microsaccades within the cue-target interval in the Posner spatial attention paradigm.
Main Results:
- Trials without microsaccades showed faster RTs.
- The last microsaccade's orientation interacted with cue validity, influencing RTs.
- Microsaccades delayed RTs for valid visual cues but showed complex effects for invalid cues depending on target modality.
Conclusions:
- Microsaccades play a crucial role in modulating performance in spatial attention tasks.
- Oculomotor processes, specifically microsaccades, are intricately linked with covert spatial attention mechanisms.
