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Summary
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Serial order in working memory is maintained by position marking. Spatial coding of serial order occurs when information is semantically processed, regardless of its type (verbal or visuospatial).

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Working Memory Research

Background:

  • Working memory theories suggest serial order relies on position marking.
  • Recent research indicates position markers may be spatial (ordinal position effect).
  • It remains unclear if serial order coding is domain-general (verbal vs. visuospatial).

Purpose of the Study:

  • To investigate whether serial order is coded in a domain-general manner.
  • To determine if spatial coding of serial order applies to both verbal and visuospatial information.
  • To identify factors influencing the domain-specificity of serial order coding.

Main Methods:

  • Conducted six experiments examining the ordinal position effect.
  • Tested serial order coding for verbal and spatial information.
  • Manipulated semantic processing of memoranda to assess its impact on spatial coding.

Main Results:

  • The ordinal position effect was observed for verbal information but not spatial information in initial experiments.
  • Subsequent experiments revealed that semantic processing, not information type, is key for spatial coding of serial order.
  • Spatial coding of serial order emerged when memoranda underwent semantic processing.

Conclusions:

  • Serial order appears to be coded in a domain-general fashion within working memory.
  • Position markers are spatially coded only when the to-be-remembered information is processed semantically.
  • This suggests a flexible mechanism for serial order representation in working memory.