Activity in the Fronto-Parietal and Visual Cortex Is Modulated by Feature-Based Attentional Weighting

Area of Science:

• Neuroscience
• Cognitive Psychology
• Visual Perception

Background:

• Stimulus representations in the visual cortex are modulated by attentional priority during dynamic activities.
• The fronto-parietal dorsal attention network plays a key role in selective attention.

Purpose of the Study:

• To investigate if subregions of the fronto-parietal network and visual cortex are modulated by feature-based attentional weighting.
• To determine if the timecourses of activity in these regions are correlated during attentional modulation.

Main Methods:

• fMRI data from 28 healthy subjects performing a feature-based go/no-go task.
• Task involved attending to one or two colored streams of gratings and responding to targets.
• Analysis included univariate and multivariate fMRI approaches.

Main Results:

• Activity in bilateral fronto-parietal (frontal eye fields, intraparietal sulcus, superior parietal lobe) and visual (V1-V4, lateral occipital cortex, fusiform gyrus) regions was modulated by attentional weighting.
• No significant difference in functional connectivity between fronto-parietal and visual regions was found when attention shifted.
• Neural activity in both networks reflects feature-based attentional modulation.

Conclusions:

• Feature-based attentional weighting modifies activity in subregions of both the fronto-parietal and visual cortex.
• This highlights the dynamic interplay between attention and sensory processing in the brain.