Flexible Coding of Visual Working Memory Representations during Distraction.

Area of Science:

• Cognitive Neuroscience
• Neuroimaging
• Visual Perception

Background:

• Visual working memory (VWM) involves widespread brain networks, including visual and parietal cortices.
• The sensory recruitment model posits VWM uses the same regions as perception.
• A key question is how VWM representations resist interference from distracting visual input.

Purpose of the Study:

• To quantitatively assess the impact of distractors on VWM representations in early visual cortex and the intraparietal sulcus (IPS).
• To investigate the persistence and susceptibility of VWM representations to interference.
• To evaluate the sensory recruitment model under distracting conditions.

Main Methods:

• Functional magnetic resonance imaging (fMRI) with an inverted encoding model approach.
• Reconstruction of VWM orientation representations before and after visual interference.
• Analysis of bias in VWM representations caused by oriented distractors in human participants.

Main Results:

• Orientation information was maintained in both early visual areas and IPS, persisting in the absence of distraction.
• Early visual cortex representations were significantly biased by distractors, showing an attractive bias.
• IPS representations showed no significant bias from distractors, indicating greater resistance to interference.

Conclusions:

• VWM representations in early visual cortex are susceptible to interference, while IPS representations are more distractor-resistant.
• A dynamic tradeoff exists between visual and parietal regions, enabling flexible adaptation of VWM.
• Findings suggest current VWM models need revision to incorporate this flexibility and dynamic interaction.