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Targeted Labeling of Neurons in a Specific Functional Micro-domain of the Neocortex by Combining Intrinsic Signal and Two-photon Imaging
Published on: December 12, 2012
Scene perception: inferior temporal cortex neurons encode the positions of different objects in the scene
Nikolaos C Aggelopoulos1, Edmund T Rolls
1University of Oxford, Department of Experimental Psychology, South Parks Road, Oxford OX1 3UD, UK.
The European Journal of Neuroscience
|December 6, 2005
Summary
Inferior temporal cortex neurons represent multiple objects in natural scenes, even in parafoveal vision. This finding is crucial for understanding how the brain perceives complex scenes with multiple items during a single glance.
Area of Science:
- Neuroscience
- Visual Perception
- Computational Neuroscience
Background:
- Inferior temporal cortex (IT) neurons typically have small receptive fields in natural scenes, aiding single object recognition.
- The role of IT neurons in representing multiple objects within a scene, especially in parafoveal vision, remains unclear.
- Understanding IT neuron function is vital for comprehending whole scene perception without eye movements.
Purpose of the Study:
- To investigate whether inferior temporal cortex (IT) neurons represent multiple objects simultaneously presented in a visual scene.
- To determine if IT neurons encode object information beyond the fovea, in parafoveal and peripheral visual fields.
- To explore the nature of receptive field asymmetries in IT neurons when multiple objects are present.
Main Methods:
- Recordings were made from IT neurons while presenting five objects simultaneously.
- Stimuli included one object at the fovea and four objects at 10 degrees eccentricity in the parafovea.
- Receptive field responses were analyzed for both foveal and parafoveal object positions, including conditions with single and multiple objects.
Main Results:
- While many IT neurons responded best to foveal stimuli, a subset (8/38) showed maximal responses to parafoveal objects.
- A significant proportion of tested neurons (35/54, 65%) exhibited asymmetric responses to objects at different parafoveal positions.
- These asymmetries were more pronounced with multiple objects, suggesting competitive interactions within receptive fields.
Conclusions:
- IT neurons contribute to representing the spatial layout of multiple objects within a scene, extending into the parafovea.
- This population-level coding of object positions is important for whole scene perception, especially with multiple items.
- Findings highlight the role of IT cortex in processing complex visual scenes beyond single object identification.
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