No evidence for a fixed object limit in working memory: Spatial ensemble representations inflate estimates of working...

Area of Science:

• Cognitive Psychology
• Neuroscience
• Visual Perception

Background:

• Visual working memory (VWM) capacity is debated, with 'slot' models proposing a fixed number of object representations (3-4).
• Object complexity is thought to affect fidelity, not quantity, of VWM representations.
• Previous studies using large change detection suggest high VWM capacity for complex objects.

Purpose of the Study:

• To investigate whether object complexity influences the number of items stored in VWM.
• To re-evaluate VWM capacity for complex objects by controlling for global visual cues.
• To challenge fixed-capacity models and support more flexible VWM theories.

Main Methods:

• Utilized change detection tasks with complex objects.
• Manipulated the availability of global ensemble and texture representations.
• Assessed individual item capacity under conditions limiting global processing.

Main Results:

• Large change detection tasks overestimate VWM capacity when global cues are available.
• When global cues are minimized, capacity for complex objects reduces to 1-2 items.
• Findings indicate VWM capacity is not fixed but influenced by object complexity and processing strategies.

Conclusions:

• Fixed-capacity 'slot' models are challenged by findings on complex object VWM.
• Flexible VWM models incorporating ensemble representations are better supported.
• VWM capacity is dynamic, influenced by item complexity and the use of global visual information.