More is generally better: Higher working memory capacity does not impair perceptual category learning

Area of Science:

• Cognitive Psychology
• Neuroscience

Background:

• Category learning is often theorized to involve competing explicit and procedural systems.
• Working memory capacity (WMC) is hypothesized to be crucial only for explicit learning.

Purpose of the Study:

• To investigate the role of WMC in explicit (filtering) and procedural (condensation) category learning.
• To test the hypothesis that WMC differentially affects explicit versus procedural systems.

Main Methods:

• Two experiments trained 160 participants on filtering and condensation category structures over three blocks.
• State-trace analysis was used to examine the influence of WMC on task performance.
• Response strategies were analyzed to assess the impact of WMC across training.

Main Results:

• Higher WMC correlated with increased accuracy in condensation tasks, but not decreased accuracy in filtering tasks.
• State-trace analysis revealed no differential impact of WMC on filtering versus condensation.
• WMC showed only a minor influence on response strategies, primarily in later training blocks.

Conclusions:

• The findings do not support the existence of category learning systems independent of WMC.
• Results are consistent with single-system models of category learning where WMC plays a more general role.
• WMC appears to influence category learning performance across different task types, rather than selectively impacting an 'explicit' system.