Positive emotion broadens attention focus through decreased position-specific spatial encoding in early visual...

Area of Science:

• Cognitive Neuroscience
• Affective Neuroscience
• Visual Perception

Background:

• Attention selection is influenced by stimulus features, expectations, and participant mood.
• Positive mood's specific impact on early sensory processing and attention allocation remains under investigation.

Purpose of the Study:

• To investigate how induced positive mood dynamically influences attention allocation.
• To determine if positive mood modulates early sensory processing in the primary visual cortex (V1).

Main Methods:

• High-density visual event-related potentials (ERPs) were recorded during a demanding central task with peripheral visual distractors.
• Neutral or positive moods were reliably induced and maintained throughout the session.
• Stimulus position varied across near, medium, and far locations in the upper visual field.

Main Results:

• The earliest retinotopic component (C1) showed a position-dependent spatial gradient, modulated by mood.
• Positive mood altered the C1 component's topography, indicating mood-dependent V1 encoding.
• Mood did not affect attention allocation to central task-relevant stimuli (P300 component).
• Behavioral control confirmed positive emotion selectively impaired attention to peripheral distractors.

Conclusions:

• Positive mood dynamically tunes position-specific encoding in V1, affecting early visual processing.
• Mood-dependent attentional effects are specific to peripheral stimuli, not central task focus.
• Findings suggest a nuanced role of mood in attention beyond the broaden-and-build theory.