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Ghosts in the machine: memory interference from the previous trial.

Charalampos Papadimitriou1, Afreen Ferdoash2, Lawrence H Snyder2

  • 1Department of Anatomy and Neurobiology, Washington University School of Medicine, St. Louis, Missouri papadimitriou.c@gmail.com.

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Summary
This summary is machine-generated.

Previous trial memories bias current spatial memory, a form of proactive interference. This bias grows with memory duration, suggesting distinct visual and sustained memory stores.

Keywords:
attractor modelinterferencespatial memory

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Area of Science:

  • Neuroscience
  • Cognitive Psychology

Background:

  • Proactive interference impairs new memory formation.
  • Previous studies used categorical tasks, limiting detailed analysis.

Purpose of the Study:

  • Investigate proactive interference in a spatial memory task.
  • Characterize the temporal and spatial profile of this interference.
  • Compare behavioral findings with attractor network models.

Main Methods:

  • Trained five macaques in a spatial delayed response task with continuous memoranda.
  • Analyzed oculomotor responses to measure memory bias.
  • Simulated results using attractor network models of working memory.

Main Results:

  • Memory in the current trial was biased towards the previous trial's memorandum location.
  • This bias magnitude increased with the current memory period duration.
  • Standard attractor models replicated the spatial bias but not its temporal profile.

Conclusions:

  • Behavioral data suggests a two-component memory system: a rapidly decaying visual store and a sustained, interference-prone store.
  • Attractor network models may need modification to fully capture proactive interference dynamics.