The role of feature-based attention in visual serial dependence

Area of Science:

• Cognitive Neuroscience
• Perception
• Psychophysics

Background:

• Perceptual decisions are influenced by recent sensory input, a bias known as serial dependence.
• Serial dependence may stabilize neural processing against noise, but its precise conditions and function (broad smoothing vs. selective stabilization) are unclear.

Purpose of the Study:

• To investigate if feature-based attention to a prior stimulus modulates serial dependence in perceptual decisions.
• To determine if attractive and repulsive biases arise from separate underlying mechanisms.

Main Methods:

• Participants estimated stimulus orientation, with prior stimuli varying in orientation and attended feature (orientation vs. size).
• Analysis focused on changes in orientation estimation bias based on stimulus similarity and attentional focus.

Main Results:

• An attractive bias was observed for similar orientations, while a repulsive bias occurred for dissimilar orientations.
• Attending to the prior stimulus's size, not orientation, significantly reduced the attractive bias.
• The repulsive bias was unaffected by feature-based attention.

Conclusions:

• Feature-based attention selectively modulates attractive serial dependence, suggesting it arises from mechanisms sensitive to specific stimulus features.
• The distinct modulation patterns for attractive and repulsive biases indicate separate neural sources for these opposing perceptual effects.