A working memory account of refixations in visual search

Area of Science:

• Cognitive Neuroscience
• Visual Perception
• Human Psychology

Background:

• Active visual exploration is crucial for navigating and understanding the environment.
• The roles of visual attention and visual working memory (VWM) in guiding exploration are debated.
• Inhibition of return (IOR) is a known mechanism affecting visual search patterns.

Purpose of the Study:

• To investigate whether visual working memory (VWM) mediates active visual exploration alongside visual attention.
• To determine the relationship between VWM capacity and visual search efficiency.
• To examine the role of VWM in oculomotor behavior during visual search.

Main Methods:

• Participants performed a visual search task and a change detection task.
• Eye movements (fixations and saccades) were recorded during visual search.
• VWM capacity was assessed using the change detection task performance.

Main Results:

• Subjects rarely refixated previously examined distractors, indicating retention of items in VWM.
• Change detection accuracy decreased with larger set sizes, confirming limited VWM capacity.
• Higher VWM capacity correlated with faster, more accurate visual search and fewer refixations.

Conclusions:

• Visual working memory capacity is a key mediator of active visual exploration.
• Findings suggest VWM, rather than a separate attentional disengagement mechanism like IOR, primarily drives active vision.
• The results support the existence of a general cognitive processing capacity involving attention, VWM, and oculomotor systems.