Related Experiment Video
Updated: May 11, 2026
05:58
Using Rapid Serial Visual Presentation to Measure Set-Specific Capture, a Consequence of Distraction While Multitasking
Published on: August 29, 2018
The impact of distractor congruency on stimulus processing in retinotopic visual cortex
Todd A Kelley1, Geraint Rees1, Nilli Lavie1
1Institute of Cognitive Neuroscience, University College London, UK.
Neuroimage
|May 8, 2013
Summary
Response competition influences early visual processing in the brain. Increased activity in the primary visual cortex (V1) during incongruent trials reduces behavioral conflict, suggesting a novel resolution mechanism.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Visual Perception
Background:
- Response competition arises from conflicting sensory information, impacting decision-making.
- Top-down control mechanisms for conflict resolution are well-studied, but their effect on early sensory processing is unclear.
- The role of the primary visual cortex (V1) in resolving response competition remains largely unknown.
Purpose of the Study:
- To investigate the impact of response competition on sensory processing in the human early retinotopic visual cortex.
- To determine if V1 activity is modulated by response-incongruent distractors.
- To explore the relationship between V1 activity and behavioral conflict effects.
Main Methods:
- Modified flanker task with speeded classification of target images (e.g., fruits, animals).
- Inclusion of congruent, incongruent, or neutral distractors in a different visual field quadrant.
- Functional magnetic resonance imaging (fMRI) to measure brain activity in healthy participants.
Main Results:
- Retinotopic V1 areas showed increased activation in response to targets when presented with response-incongruent distractors compared to neutral distractors.
- A negative correlation was observed between increased V1 response to incongruent targets and behavioral response competition effects.
- This suggests that enhanced V1 processing in incongruent trials mitigates behavioral conflict.
Conclusions:
- Primary visual cortex (V1) is involved in resolving response competition.
- V1 exhibits enhanced processing for targets under response conflict.
- A novel conflict resolution mechanism may operate within V1, influencing behavioral outcomes.
Related Concept Videos
01:24Color Vision
Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
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,...
01:24Vision
Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.