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STN-DBS Increases Proactive but Not Retroactive Interference During Verbal Learning in PD.

Dejan Georgiev1,2,3, Sanja Roškar1, Anja Čuš2

  • 1Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, London, United Kingdom.

Movement Disorders : Official Journal of the Movement Disorder Society
|December 17, 2020
PubMed
Summary

Subthalamic nucleus deep brain stimulation (STN-DBS) in Parkinson's disease patients worsened proactive interference (PI) in verbal learning but did not affect retroactive interference (RI). This highlights STN's role in memory inhibition.

Keywords:
deep brain stimulation; subthalamic nucleus; Parkinson's disease; verbal learning; proactive interference; retroactive interference

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Proactive interference (PI) impairs new learning due to prior information, linked to deficient inhibitory memory processes.
  • Retroactive interference (RI) occurs when new learning hinders recall of older information.
  • Subthalamic nucleus deep brain stimulation (STN-DBS) in Parkinson's disease (PD) may affect specific cognitive functions like inhibitory control.

Purpose of the Study:

  • To investigate the acute effects of STN-DBS on proactive interference (PI) and retroactive interference (RI) during verbal learning in Parkinson's disease patients.

Main Methods:

  • Twenty Parkinson's disease patients undergoing STN-DBS were assessed using the California Verbal Learning Test-II.
  • Testing involved a within-subject design comparing ON and OFF STN-DBS stimulation conditions.

Main Results:

  • STN-DBS significantly increased proactive interference (PI) during verbal learning (P = 0.012).
  • No significant effect of STN-DBS was observed on retroactive interference (RI) (P = 0.816).

Conclusions:

  • The findings suggest that the subthalamic nucleus (STN) plays a role in the inhibitory control necessary for preventing proactive interference.
  • STN-DBS may impact memory processes by altering inhibitory mechanisms involved in learning and recall.