Saccades toward the target are planned as sequences rather than as single steps
Jelmer P De Vries1, Ignace T C Hooge, Frans A J Verstraten
11Department of Experimental Psychology, Helmholtz Institute, Utrecht University.
Psychological Science
|October 30, 2013
Summary
Researchers explored visual search scan paths, finding that planned eye movements guide target acquisition. The study shows observers can adjust their scan paths based on rapid processing of changing visual information.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Visual Perception
Background:
- Visual search involves sequential eye movements (scan paths) to locate targets.
- The extent to which these scan paths are pre-planned remains an open question in visual cognition.
Purpose of the Study:
- To investigate whether saccade (eye movement) destinations in visual search scan paths are planned in advance.
- To determine the flexibility of these planned paths when visual stimuli change.
Main Methods:
- Two experiments were conducted, manipulating stimulus configurations during initial saccades.
- A secondary task was used to assess the influence of planned scan paths on cognitive load.
- Observer's ability to deviate from potentially planned paths was measured.
Main Results:
- Deviations from planned scan paths were possible but depended on the rapid processing of altered visual configurations.
- Evidence suggests that planned scan paths can encompass at least three saccade destinations.
- Planned scan paths significantly influenced performance on a secondary task.
Conclusions:
- These findings provide the first empirical evidence supporting the concept of scan-path planning in visual search.
- Scan paths are not merely reactive but involve a degree of proactive planning, allowing for adjustments based on visual feedback.
