Differing Time Courses of Reward-Related Attentional Processing: An EEG Source-Space Analysis

Area of Science:

• Neuroscience
• Cognitive Psychology
• Visual Attention

Background:

• Limited processing capacity necessitates attentional selection.
• Attentional selection is typically divided into bottom-up and top-down processes.
• Emerging research highlights the role of reward in guiding attention.

Purpose of the Study:

• To investigate reward's influence on attentional selection for both targets and distractors.
• To explore reward-related processing using neurophysiological measures and source space analysis.
• To examine the temporal dynamics of reward-based attentional mechanisms.

Main Methods:

• Utilized an additional singleton task with reward-associated stimuli.
• Employed neurophysiological measures (EEG/MEG) and source space analysis.
• Analyzed neural activity in response to reward-related targets and distractors.

Main Results:

• Rewarding distractors caused stronger attentional capture.
• Reward-associated distractors, compared to targets, increased frontal activation, suggesting top-down control.
• Source space analysis confirmed activation in the value-based attention network for both reward-related targets and distractors.

Conclusions:

• Reward significantly biases attentional selection, affecting visual search efficiency.
• Distinct time-dependent neural mechanisms underlie reward biasing for task-relevant versus task-irrelevant stimuli.
• The findings support a value-based attention network involving visual cortex and anterior cingulate.