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Related Concept Videos

Brain Imaging01:14

Brain Imaging

234
Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
These technologies include computerized axial tomography (CAT or CT scans), positron-emission tomography (PET scans),  magnetic resonance imaging (MRI),  functional magnetic resonance imaging (fMRI), and Transcranial Magnetic...
234

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Related Experiment Video

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Measuring and Manipulating Functionally Specific Neural Pathways in the Human Motor System with Transcranial Magnetic Stimulation
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Functional and anatomical connectivity predict brain stimulation's mnemonic effects.

Youssef Ezzyat1, James E Kragel2, Ethan A Solomon3

  • 1Dept. of Psychology, Wesleyan University, Middletown, CT 06459, USA.

Cerebral Cortex (New York, N.Y. : 1991)
|December 2, 2023
PubMed
Summary

Optimizing brain stimulation for memory involves targeting specific brain networks. Closed-loop stimulation of the lateral temporal cortex improved memory when precisely targeted near white matter pathways and connected to memory networks.

Keywords:
brain stimulationepisodic memoryfunctional connectivityintracranial EEGwhite matter

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Neuromodulation

Background:

  • Direct brain stimulation offers potential for modulating neural activity and behavior.
  • Optimal targeting strategies for brain stimulation remain an area of active research, particularly for specific cognitive functions.
  • Understanding the relationship between stimulation targets and brain network properties is crucial for effective neuromodulation.

Purpose of the Study:

  • To test if stimulation's effects depend on anatomical and functional network properties of the target site.
  • To investigate how closed-loop stimulation of the lateral temporal cortex (LTC) impacts memory function.
  • To identify optimal targeting parameters for enhancing episodic memory through brain stimulation.

Main Methods:

  • Utilized closed-loop direct brain stimulation in 47 neurosurgical patients during a memory task.
  • Employed multivariate classifiers to detect memory lapses and trigger LTC stimulation.
  • Analyzed stimulation effects based on proximity to white matter pathways and functional connectivity to memory networks.

Main Results:

  • Lateral temporal cortex (LTC) stimulation improved memory recall when delivered to targets adjacent to white matter.
  • The greatest memory improvements were observed for targets near white matter with high functional connectivity to the brain's memory network.
  • These targeted stimulation sites reduced low-frequency activity, a marker of successful memory encoding.

Conclusions:

  • Anatomical and functional network properties critically mediate the behavioral and physiological effects of brain stimulation.
  • Closed-loop LTC stimulation can effectively enhance episodic memory.
  • Precise targeting based on network properties offers a method for optimizing neuromodulation strategies.