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State-trace analysis: dissociable processes in a connectionist network?

Fayme Yeates1, Andy J Wills2, Fergal W Jones3

  • 1School of Psychology, University of Exeter.

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Summary
This summary is machine-generated.

State-trace analysis can be misleading. Simulations show that multiple functions in state-trace plots may indicate parameter variation within a single system, not necessarily multiple systems.

Keywords:
Computer simulationConnectionist networkDual processesModel evaluationMultiple systemsState-trace analysis

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Area of Science:

  • Cognitive science
  • Computational neuroscience
  • Machine learning

Background:

  • Inferring multiple cognitive systems from dissociation data is common but debated.
  • State-trace analysis offers a graphical method to distinguish single vs. multiple underlying processes.
  • This method plots performance across conditions to reveal one (single process) or more (multiple processes) functions.

Purpose of the Study:

  • To investigate whether state-trace plots with multiple functions necessarily imply multiple underlying systems.
  • To examine the interpretation of state-trace analysis in computational models.

Main Methods:

  • Simulations were conducted using a simple recurrent network (SRN) and a single-layer error-correcting network.
  • Performance was analyzed using state-trace plots under varying conditions, including changes in learning rate.

Main Results:

  • Simulations with the simple recurrent network (SRN) demonstrated state-trace plots exhibiting multiple functions when the learning rate varied.
  • Simulations with a single-layer network produced plots with a single function.
  • The results indicate that multiple functions can arise from parameter variation within a single system.

Conclusions:

  • Multiple functions in state-trace plots do not automatically support dual-system accounts.
  • Parameter variation within a single-system model can generate complex state-trace plots.
  • Re-evaluation of dissociation interpretations using state-trace analysis is warranted.