Visual Working Memory of Chinese Characters and Expertise: The Expert's Memory Advantage Is Based on Long-Term...

Area of Science:

• Cognitive Psychology
• Neuroscience
• Human Expertise

Background:

• Individuals unfamiliar with Chinese characters demonstrate poorer visual working memory (VWM) for these characters compared to proficient readers.
• The underlying mechanisms of this expertise advantage in VWM remain incompletely understood.

Purpose of the Study:

• To investigate the reasons behind the visual working memory expertise advantage observed in Chinese character readers.
• To determine if this advantage relies on abstract representations or specific visual word form knowledge.

Main Methods:

• A series of experiments were conducted, including behavioral tasks and functional magnetic resonance imaging (fMRI).
• Novices were trained to acquire visual word form knowledge, followed by a change detection task assessing trained and novel characters.
• fMRI data analyzed set size- and training-dependent effects in the intraparietal sulcus (IPS) and visual word form area.

Main Results:

• The expertise advantage did not transfer to novel material, and memory performance was similar for novices and experts on non-expert material.
• VWM performance was significantly better for trained characters than for novel characters in trained novices.
• Neural activity in the IPS and visual word form area showed distinct patterns related to set size and knowledge status, with experts exhibiting more efficient processing.

Conclusions:

• The superior VWM performance in Chinese literates stems from the availability of visual long-term representations (word form types).
• These representations enable a sparse stimulus encoding in VWM, facilitating the detection of changes as type alterations.
• Expertise in recognizing visual forms enhances cognitive processing efficiency in working memory.