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Visual field meridians modulate the reallocation of object-based attention
Adam J Barnas1, Adam S Greenberg2
1Department of Psychology, University of Wisconsin-Milwaukee, Milwaukee, WI, 53201, USA.
Attention, Perception & Psychophysics
|May 7, 2016
Summary
Visual field meridians significantly influence object-based attention (OBA). Horizontal shifts across the vertical meridian are prioritized over vertical shifts, especially near fixation, impacting attention reorientation.
Area of Science:
- Cognitive Neuroscience
- Visual Perception
- Attention Studies
Background:
- Object-based attention (OBA) enhances processing within selected object boundaries.
- Previous studies noted larger OBA effects for horizontal versus vertical stimuli, potentially linked to visual field meridians.
Purpose of the Study:
- To investigate the modulatory role of visual field meridians on object-based attention.
- To test the hypothesis that contralateral visual cortex organization influences OBA prioritization.
Main Methods:
- Participants performed detection tasks with peripheral cues on L-shaped objects, with targets offset horizontally or vertically.
- Experiments varied object presentation (single vs. multiple) and proximity to fixation and meridians.
Main Results:
- A horizontal shift advantage (faster reaction times for horizontal shifts across the vertical meridian) was observed in Experiments 1 and 2.
- This advantage persisted regardless of whether attention shifted within or between objects.
- Experiment 3 showed this advantage disappeared for objects far from fixation but reappeared near fixation.
Conclusions:
- Visual field meridians critically modulate the efficiency of reorienting object-based attention.
- The findings support a role for visual field meridian interactions in attention shifts.
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