AI Article Synopsis
- The study investigates how the brain processes groups of similar visual stimuli to understand ensemble coding, specifically looking at how task relevance affects this process.
- Researchers used fMRI to track brain responses, finding that orientation-selective activity increased in the visual hierarchy only when the average orientation was important for the task.
- The results indicate that while ensemble representations are present even without task relevance in areas like the extrastriate region (V3), they are more pronounced in frontal regions when linked to motor responses, suggesting a complex pooling of visual information across different processing levels.
Article Abstract
The human visual system is able to extract summary statistics from sets of similar items, but the underlying neural mechanism remains poorly understood. Using functional magnetic resonance imaging (fMRI) and an encoding model, we examined how the neural representation of ensemble coding is constructed by manipulating the task-relevance of ensemble features. We found a gradual increase in orientation-selective responses to the mean orientation of multiple stimuli along the visual hierarchy only when these orientations were task-relevant. Such responses to the ensemble orientation were present in the extrastriate area, V3, even when the mean orientation was not task-relevant, indicating that the ensemble representation can co-exist with the task-relevant individual feature representation. Ensemble orientations were also represented in frontal regions, but those representations were robust only when each mean orientation was linked to a motor response dimension. Together, our findings suggest that the neural representation of the ensemble percept is formed by pooling signals at multiple levels of the visual processing stream.
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| http://dx.doi.org/10.1016/j.neuroimage.2021.118680 | DOI Listing |
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