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Visual field asymmetries and allocation of attention in visual scenes
Dell L Rhodes1, Lynn C Robertson
1Reed College, 3203 S.E. Woodstock Boulevard, Portland, OR 97202, USA. dell.rhodes@reed.edu
Brain and Cognition
|October 10, 2002
Summary
Visual processing asymmetries can be influenced by the surrounding context, even when the scene is rotated. Spatial attention allocation plays a role in these scene-based asymmetries, regardless of direct hemispheric access.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Visual Perception
Background:
- Hemispheric differences in cognitive processing are often studied using isolated stimuli in visual fields.
- Real-world visual processing involves targets within complex scenes, influencing attention and representation.
- The impact of visual context on processing asymmetries and attention allocation remains incompletely understood.
Purpose of the Study:
- To investigate processing asymmetries for visual targets within a contextual scene.
- To determine if visual attention allocation affects these asymmetries.
- To examine if attention-related asymmetries persist in misaligned scenes.
Main Methods:
- Experiments involved presenting visual targets within frames (scenes) under varying spatial precue conditions.
- Scene orientation was manipulated (upright and rotated 90 degrees).
- Analysis focused on visual field asymmetries and the influence of spatial attention.
Main Results:
- Spatial precue validity significantly affected visual field asymmetries in upright frames.
- Similar processing asymmetries were observed even when frames were rotated 90 degrees.
- Further experiments explored additional sources contributing to these spatial asymmetries.
Conclusions:
- Left-right processing asymmetries can be organized within visual scenes.
- These scene-based asymmetries are influenced by spatial attention deployment.
- Such asymmetries can occur without requiring differential direct access to the brain's hemispheres.