Interference between items stored for distinct tasks in visual working memory

Area of Science:

• Cognitive Psychology
• Neuroscience
• Human Perception

Background:

• The action perspective posits working memory (WM) representations are task-specific.
• Alternative theories suggest a task-agnostic common workspace for WM storage.
• Investigating concurrent maintenance of distinct visual items is crucial for understanding WM architecture.

Purpose of the Study:

• To determine if visual items memorized for different tasks are stored separately or interfere.
• To test for evidence of a common workspace in working memory.
• To differentiate WM storage from earlier perceptual and iconic memory stages.

Main Methods:

• Two experiments combined a framing memory task with an embedded memory task.
• Participants memorized motion directions for different report types (continuous vs. binary discrimination).
• Interference effects (repulsion, precision degradation) were measured during concurrent maintenance.

Main Results:

• Significant inter-item interference (repulsion and precision degradation) observed between concurrently held visual items.
• Interference increased with item similarity.
• Control conditions showed weaker repulsion and no precision interference prior to WM consolidation.

Conclusions:

• Working memory exhibits inter-item interference, even for items with distinct task demands.
• Results support the existence of a common workspace for storing distinct task items in working memory.
• Interference effects are unique to working memory consolidation, not earlier sensory stages.