Task-irrelevant inputs alter ensemble representations of faces within the spatial focus of attention

Area of Science:

• Cognitive Psychology
• Visual Perception
• Neuroscience

Background:

• Spatial attention is crucial for efficient information processing.
• The influence of unattended, task-irrelevant information on visual processing within attended spatial regions remains incompletely understood.

Purpose of the Study:

• To investigate how task-irrelevant visual stimuli at unattended locations affect perception within the focus of spatial attention.
• To determine if unattended information biases ensemble representations of attended stimuli.

Main Methods:

• Participants performed an emotional expression averaging task on attended faces.
• Task-irrelevant faces were presented at spatially unattended locations.
• Control experiments confirmed the direction of spatial attention.

Main Results:

• Perception of attended faces was systematically biased by the emotional expression of unattended faces.
• For instance, exposure to happier unattended faces led to perceiving attended faces as happier.
• This bias occurred despite attention being directed to the cued location.

Conclusions:

• Unattended and task-irrelevant visual input can systematically bias ensemble representations within the focus of attention.
• The impact of irrelevant information extends beyond mere efficiency decrements (e.g., slower responses) to actively shaping perception.
• These findings highlight the pervasive influence of distractors on visual processing and perception.