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On the superiority of visual processing in spatiotopic coordinates
Alon Mann1, Ilana Naveh2, Ehud Zohary2
1Neurobiology Department, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.
Vision Research
|July 25, 2018
Summary
Spatial priming effects are reduced when accounting for a bias towards screen-centered targets. This center preference is encoded in allocentric coordinates, suggesting optimal spatial attention allocation.
Area of Science:
- Cognitive psychology
- Neuroscience
- Visual perception
Background:
- Organisms leverage environmental regularities for optimized goal achievement.
- Spatial priming, where stimulus repetition at the same location speeds response time, is a known phenomenon.
- Prior research suggested spatial priming occurs in spatiotopic coordinates, even with eye movements.
Purpose of the Study:
- To investigate the influence of a screen-center bias on previously reported spatiotopic priming effects.
- To determine the reference frame (allocentric vs. egocentric) for the preferred central stimulus position.
Main Methods:
- A reaction time experiment using a stimulus repetition paradigm similar to prior studies.
- Analysis of priming effects while controlling for a preference for screen-centered targets.
- A second experiment to assess the coordinate system used for encoding the preferred central location.
Main Results:
- Reaction times were significantly faster for screen-centered targets compared to other positions.
- Accounting for this center preference substantially reduced, but did not eliminate, spatiotopic priming effects.
- The preferred central stimulus position is encoded in allocentric coordinates, not egocentric ones.
Conclusions:
- A bias towards the screen center influences spatial attention and priming.
- The screen center is represented in an allocentric frame of reference.
- This center preference likely optimizes spatial attention allocation for improved performance.
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