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Behavioral and Neural Representations of Spatial Directions across Words, Schemas, and Images
Steven M Weisberg1, Steven A Marchette2, Anjan Chatterjee3
1Department of Neurology and stweis@pennmedicine.upenn.edu.
Summary
The human brain processes spatial directions differently across visual scenes, schemas, and words. Abstract formats like schemas and words are interpreted faster than complex visual scenes, with distinct neural pathways involved.
Area of Science:
- Cognitive Neuroscience
- Spatial Navigation
- Human Brain Function
Background:
- Modern spatial navigation relies on integrating information from visual scenes, schematic signs, and abstract words.
- Understanding how the brain processes and transforms spatial directions across these diverse formats is crucial for explaining navigation strategies.
- Different representational formats offer unique advantages and limitations, impacting cognitive load and processing speed.
Purpose of the Study:
- To investigate the neural mechanisms underlying spatial direction computation across visual scenes, schemas, and words.
- To identify similarities and differences in brain activity associated with processing these distinct spatial information formats.
- To explore how the brain decodes and integrates spatial information for effective navigation.
Main Methods:
- A preregistered behavioral study measuring response times to spatial directions presented as images, schemas, or words.
- A neuroimaging study using multivoxel pattern analysis of fMRI data to decode spatial representations.
- Comparison of neural decoding across different representational formats and between formats.
Main Results:
- Participants responded significantly faster to schemas and words compared to complex visual scenes.
- Spatial directions from visual scenes were decodable in the bilateral intraparietal sulcus, a region not significantly activated for schemas or words.
- Spatial directions were decodable across all three formats, indicating cross-representational processing.
Conclusions:
- The intraparietal sulcus is critical for processing spatial directions in visual scenes, but this neural pathway may be bypassed for abstract formats.
- Abstract spatial representations (schemas, words) are processed more efficiently than concrete visual scenes.
- These findings support a dual model of spatial interpretation: one for real-world action and another for efficient visual comparison.
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