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Item strength affects working memory capacity.

Zhangfan Shen1,2, Vencislav Popov2,3, Anita B Delahay2

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human Memory

Background:

  • Working memory (WM) capacity is crucial for complex cognitive tasks.
  • The influence of stimulus familiarity on WM resource allocation remains an active area of research.

Purpose of the Study:

  • To investigate whether processing and manipulating less familiar stimuli demand greater working memory resources.
  • To determine if problem-solving difficulty increases with less familiar symbols.

Main Methods:

  • A dual-task paradigm was employed, combining algebra problem-solving with memorizing novel symbol-digit associations.
  • Stimulus familiarity was manipulated using Chinese characters with differential training frequencies over 3 weeks.
  • Participants solved algebra equations of varying complexity (one or two transformations) involving these characters.

Main Results:

  • Higher accuracy and faster response times were observed for simpler problems (one transformation, no substitution) and high-frequency characters.
  • The impact of stimulus familiarity on performance intensified with increased working memory demands.
  • Recall of character-digit associations was poorer for low-frequency characters.

Conclusions:

  • Working memory capacity is influenced by both the quantity and the strength (familiarity) of information chunks.
  • Stimulus familiarity plays a critical role in cognitive load and the efficiency of working memory.