Increased brain activation during the processing of spatially invalidly cued targets

Area of Science:

• Neuroscience
• Cognitive Psychology
• Electrophysiology

Background:

• The Posner spatial cueing task investigates attention and its neural underpinnings.
• Understanding the neuro-cognitive consequences of validly cued (VC) versus invalidly cued (IC) targets is crucial for mapping attentional processes.

Purpose of the Study:

• To evaluate the neuro-cognitive consequences of processing validly cued (VC) and invalidly cued (IC) targets using EEG.
• To identify the brain regions involved in processing IC targets through source localization.

Main Methods:

• Utilized a spatial central cue Posner paradigm with targets presented on the vertical meridian.
• Recorded electroencephalography (EEG) from 64 channels.
• Applied LORETA and single dipole source localization techniques to event-related potentials (ERPs).

Main Results:

• Invalidly cued (IC) targets elicited an enhanced P3 component compared to validly cued (VC) targets.
• Source localization revealed early P3 activity in the dorsal anterior cingulate cortex (dACC).
• Late P3 activity was localized posteriorly to the early P3, with LORETA identifying additional sources in the parahippocampal gyrus and differential activation in the inferior frontal gyrus for IC targets.

Conclusions:

• Subjects prepare for tasks based on cue information, leading to increased frontal activation, including conflict monitoring areas, when IC targets appear.
• Processing IC targets involves revising internal task models, potentially through temporo-mesial surface activation.
• Significantly higher overall brain activation occurs during IC trials compared to VC trials.