Related Experiment Video
Updated: Jul 19, 2026
10:33
Correlating Behavioral Responses to fMRI Signals from Human Prefrontal Cortex: Examining Cognitive Processes Using Task Analysis
Published on: June 20, 2012
Oddball and incongruity effects during Stroop task performance: a comparative fMRI study on selective attention.
Tobias Melcher1, Oliver Gruber
1Cognitive Neuroscience Unit, Department of Psychiatry and Psychotherapy, Saarland University Hospital, POB, D-66421 Homburg (Saar), Germany. tobias.melcher@uniklinikum-saarland.de
Brain Research
|October 7, 2006
Summary
This fMRI study reveals distinct neural mechanisms for selective attention during competition. Competition from task-irrelevant information, like word meaning (Stroop-incongruity) or oddballs, activates different brain regions related to motor preparation and attention.
Area of Science:
- Neuroscience
- Cognitive Psychology
Background:
- Selective attention is crucial for filtering information.
- Competition between task-relevant and irrelevant stimuli challenges attentional control.
- Understanding neural mechanisms of competition informs cognitive theories.
Purpose of the Study:
- To compare neural mechanisms of selective attention under two competition types: Stroop-incongruity and oddballs.
- To investigate the influence of processing domain (color, word meaning) on competition.
- To identify distinct neural components related to motor preparation and attention.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was used.
- A Stroop-like oddball task was employed, responding to font size.
- Competition was operationalized via incongruent word stimuli and low-frequency oddballs in different dimensions.
Main Results:
- Reaction times were significantly prolonged in all competition conditions.
- fMRI data showed two components: motor preparation (Stroop-interference) and attention (oddballs).
- Word-oddballs activated a frontoparietal attention network, with overlap between Word- and Color-oddballs in prefrontal and posterior areas.
Conclusions:
- Selective attention involves distinct neural processes for different types of information competition.
- Posterior lateral prefrontal cortex plays a key role in top-down attentional control.
- The findings contribute to understanding how the brain manages competing information streams.
