Dissociating Reward- and Attention-driven Biasing of Global Feature-based Selection in Human Visual Cortex

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Visual Perception

Background:

• Reward-driven prioritization influences visual selection.
• The impact of reward on sensory processing in the visual cortex is debated.
• It remains unclear if reward-driven modulations are independent of attention-driven modulations.

Purpose of the Study:

• Investigate if visual cortex modulations for target and reward colors are separable.
• Examine how attention demands affect reward-driven modulations.
• Differentiate the neural mechanisms of target selection versus reward association.

Main Methods:

• Magnetoencephalography (MEG) in human observers.
• Measured event-related magnetic field responses to color probes.
• Manipulated attention demands on target selection while keeping reward parameters constant.

Main Results:

• Reward and target relevance induced similar gain modulations in ventral extrastriate cortex.
• Increased attention demands on target discrimination enhanced target-color responses.
• Responses to reward-associated colors remained largely unchanged with increased attention.

Conclusions:

• Task relevance and reward influence the same feature-selective areas in the visual cortex.
• Modulations driven by task relevance and reward are largely independent.
• Attention and reward exert distinct influences on visual sensory selection.