Perceptual comparisons modulate memory biases induced by new visual inputs.

Area of Science:

• Cognitive Psychology
• Neuroscience
• Visual Perception

Background:

• Visual working memory (VWM) is susceptible to biases from new perceptual information.
• These biases are often linked to physical similarity between VWM content and new stimuli.
• Prior research suggests explicit similarity comparisons may further modulate these memory biases.

Purpose of the Study:

• To investigate whether explicit perceptual comparisons causally modulate visual working memory (VWM) biases.
• To compare memory bias sizes after explicit comparisons versus ignoring or maintaining new stimuli in VWM.
• To determine if similarity judgments, not just stimulus overlap, influence VWM biases.

Main Methods:

• Participants performed tasks involving visual working memory and explicit perceptual comparisons.
• Memory biases were measured by comparing VWM reports under different conditions: explicit comparison, ignoring new input, and co-maintaining new input.
• Analysis correlated bias amplification with participants' similarity judgments.

Main Results:

• Larger attraction biases were observed following explicit perceptual comparisons compared to other conditions.
• Memory biases were amplified when participants judged stimuli as similar to VWM content, but not when judged dissimilar.
• These effects persisted after controlling for physical stimulus similarity and baseline memory precision.

Conclusions:

• Explicit perceptual comparisons play a causal role in modulating visual working memory biases.
• The act of comparing and judging similarity significantly influences how memory is distorted by new information.
• Findings highlight the active, rather than purely passive, nature of VWM updating and bias formation.