How Configural Is the Configural Superiority Effect? A Neuroimaging Investigation of Emergent Features in Visual...

Area of Science:

• Cognitive Neuroscience
• Visual Perception
• Computational Neuroscience

Background:

• Perception of visual stimuli depends on both local features and their arrangement.
• Emergent features arise from organized feature interactions, leading to the Configural Superiority Effect (CSE).
• Previous research treated CSE as an 'all or none' phenomenon, limiting understanding of graded configurality.

Purpose of the Study:

• To investigate how behavioral and neuroimaging markers of emergent features respond to varying degrees of visual configurality.
• To explore the neural processing of emergent features beyond the binary configural vs. non-configural distinction.
• To determine if neural correlates of emergent features are present in stimuli that are not fully configural.

Main Methods:

• Utilized a visual search task where subjects identified an anomalous quadrant within stimulus arrays.
• Manipulated the degree of configurality by systematically altering the rotational angle of low-level features.
• Employed functional magnetic resonance imaging (fMRI) to record brain activity during the task.

Main Results:

• Behavioral performance showed faster response times as the degree of configurality increased.
• Neuroimaging data revealed increased response magnitude in visual areas, including early visual cortex and object-selective cortex, with higher configurality.
• Neural correlates of emergent features were detected even in stimuli with partial configurality.

Conclusions:

• The neural processing of emergent features is sensitive to the degree of configurality, not just its presence or absence.
• Emergent feature processing occurs along a continuum, with graded neural responses.
• Configural information is processed early in the visual hierarchy, influencing perception even before stimuli reach full configural organization.