Related Experiment Video
Updated: Aug 7, 2026
13:00
Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments
Published on: January 23, 2017
Electrophysiological evidence for temporal dissociation between spatial attention and sensory competition during
Corentin Jacques1, Bruno Rossion
1Unité Cognition et développement & Laboratoire de Neurophysiologie, University of Louvain, Belgium. corentin.jacques@psp.ucl.ac.be
Cerebral Cortex (New York, N.Y. : 1991)
|June 15, 2006
Summary
Neural processes for recognizing faces, measured by N170 event-related potentials (ERPs), are affected by both spatial attention and sensory competition. These distinct mechanisms influence early visual selection in the brain.
Area of Science:
- Cognitive Neuroscience
- Visual Perception
- Electrophysiology
Background:
- Scalp event-related potential (ERP) studies show reduced N170 amplitudes (130-170 ms) during concurrent face processing, suggesting neural competition in the occipitotemporal cortex.
- This reduction implies that neural representations of individual faces compete early, around 130 ms after stimulus onset.
Purpose of the Study:
- To investigate the distinct roles of spatial attention and sensory competition in modulating the N170 amplitude during concurrent face stimulation.
- To determine the temporal dynamics of spatial attention and sensory competition effects on early visual processing of faces.
Main Methods:
- Recorded event-related potentials (ERPs) time-locked to a lateralized face stimulus.
- Manipulated central stimulus (face vs. scrambled face) and attentional load at fixation (high vs. low) as experimental factors.
- Analyzed N170 amplitude modulation in response to the lateralized face stimulus under different conditions.
Main Results:
- N170 amplitude was reduced when the central stimulus was a face (vs. scrambled) and when attentional load was high, with additive effects.
- Spatial attention modulated visual processes significantly earlier (around 80 ms) than sensory competition effects (around 130 ms).
- These findings indicate that spatial attention and sensory competition are distinct mechanisms influencing early visual selection.
Conclusions:
- The N170 response to faces is modulated by spatial attention, demonstrating its role in early face processing.
- Spatial attention and sensory competition operate through separate mechanisms for early visual information selection in the extrastriate cortex.
- These distinct processes contribute to how the brain prioritizes and processes visual information, particularly faces.
Related Concept Videos
01:21Association Areas of the Cortex
Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
01:20Parallel Processing
The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...