Selection of events in time enhances activity throughout early visual cortex

Area of Science:

• Neuroscience
• Cognitive Science
• Perception

Background:

• Temporal selection is crucial for managing sensory input and protecting goal-relevant information.
• Contextual information concurrent with stimuli aids learning.
• Understanding how the brain handles temporal selection is key to understanding attention and perception.

Purpose of the Study:

• To investigate how visual cortical regions respond to temporal selection of auditory and visual stimuli.
• To examine brain regions not directly involved in processing the target stimulus during temporal selection.
• To differentiate temporal selection effects from multimodal processing, target rarity, or motor responses.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
• Participants performed a temporal selection task involving auditory target tones.
• Activity in visual cortical regions was analyzed in relation to target and distractor tones.

Main Results:

• Activity in primary visual cortex (V1) increased more after target tones than distractor tones.
• This effect was more pronounced in V1 compared to V2 and V3, differing from spatial attention patterns.
• Enhanced activity was observed in regions not typically involved in representing the target stimulus.

Conclusions:

• Temporal selection of behaviorally relevant stimuli enhances activity in perceptual regions, not just target-processing areas.
• This enhancement occurs even in visual cortex when selecting auditory targets.
• The findings challenge the notion that attention solely suppresses irrelevant sensory information, suggesting a broader enhancement mechanism.