Understanding the collinear masking effect in visual search through eye tracking.
Janet H Hsiao1,2, Antoni B Chan3, Jeehye An1
1Department of Psychology, University of Hong Kong, Hong Kong, Hong Kong.
Psychonomic Bulletin & Review
|June 10, 2021
Summary
Visual search can be hindered when orientation contrast and collinearity combine, causing target masking. This effect is linked to pre-saccadic attention shifts, not age-related cognitive decline.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Visual Perception
Background:
- Orientation contrast and collinearity typically enhance target salience in visual search.
- Counterintuitively, their combination can lead to a masking effect, hindering target detection.
Purpose of the Study:
- To investigate the mechanism behind the collinear masking effect in visual search.
- To examine the role of pre-saccadic attention shifts and age-related differences in this phenomenon.
Main Methods:
- Utilized eye-tracking technology and eye-movement analysis with hidden Markov models (EMHMM).
- Measured eye-fixation consistency (entropy) at a central fixation cross before search display presentation.
- Compared visual search performance and eye movement patterns between young and older adults.
Main Results:
- The collinear masking effect correlated with reduced eye-fixation consistency before the search display.
- This suggests a pre-saccadic attention shift to a non-goal location, interfering with target capture.
- No significant age differences were found in the masking effect, despite older adults showing slower responses and less consistent eye movements.
Conclusions:
- Pre-saccadic attention shifts, rather than age-related cognitive decline, significantly influence the collinear masking effect.
- Understanding attention dynamics before visual search is crucial for explaining search behavior and target salience.
