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10:05
A Large Lateral Craniotomy Procedure for Mesoscale Wide-field Optical Imaging of Brain Activity
Published on: May 7, 2017
Configural specificity of the lateral occipital cortex.
L G Appelbaum1, J M Ales, B Cottereau
1Center for Cognitive Neuroscience, Duke University, Durham, NC 27708, USA. greg@duke.edu
Neuropsychologia
|July 20, 2010
Summary
Object-selective lateral occipital cortex (LOC) activation requires a surrounded figure-ground configuration. Kinetic boundaries alone are insufficient for triggering selective processing in the LOC, highlighting spatial organization
Area of Science:
- Neuroscience
- Visual Perception
- Cognitive Science
Background:
- The lateral occipital cortex (LOC) is known for object selectivity.
- The role of perceptual organization, particularly figure-ground relationships, in object processing is debated.
- Specific cues triggering LOC selectivity remain unclear.
Purpose of the Study:
- To investigate the role of perceptual organization in activating the object-selective LOC.
- To determine if figure-ground relationships are necessary for LOC activation.
- To differentiate the effects of kinetic boundaries versus spatial configuration on LOC response.
Main Methods:
- Utilized two-region visual stimuli modulated at different temporal frequencies.
- Compared symmetric (ambiguous figure-ground) and asymmetric (unambiguous, surrounded figure-ground) arrangements.
- Measured visual evoked potentials to assess LOC activity relative to early visual areas (V1-V3).
Main Results:
- The surrounded figure-ground arrangement significantly increased LOC activity compared to early visual areas.
- Symmetric stimuli, despite having kinetic boundaries, did not elicit response selectivity in the LOC.
- LOC activation was dependent on the spatial configuration, not solely on kinetic texture boundaries.
Conclusions:
- A surrounded figure-ground spatial configuration is necessary and sufficient for selective activation of the LOC.
- Kinetic texture boundaries alone are insufficient to trigger object-selective processing in the LOC.
- Perceptual organization, specifically the figure-ground relationship, plays a critical role in higher-level visual object processing.
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