Working memory for stereoscopic depth is limited and imprecise-evidence from a change detection task

Area of Science:

• Cognitive Psychology
• Neuroscience
• Human Perception

Background:

• Visual working memory (VWM) and spatial working memory (SWM) studies typically use fronto-parallel stimuli, neglecting depth perception.
• Existing research on stereoscopic depth's effect on VWM leaves gaps in understanding depth storage in working memory.

Purpose of the Study:

• To investigate working memory capacity and precision for stereoscopic depth information.
• To systematically explore how depth positions are stored and recalled in working memory.

Main Methods:

• A change detection task was employed with memory items presented at various stereoscopic depth planes.
• Participants judged whether the depth position of a target item had changed.

Main Results:

• A conservative response bias towards 'no change' was observed when detecting depth changes.
• Change detection accuracy decreased with more memory items, showing lower accuracy than for VWM.
• Detection sensitivity was higher for nearest/farthest depths and when probes were presented with original items.

Conclusions:

• Working memory for depth is significantly limited and less precise than for visual information.
• The storage of depth information is influenced by its relationship with other stored depth positions.
• Depth perception in working memory is constrained, with potential biases and varying sensitivity based on depth range and context.