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Transcranial Direct Current Stimulation Over Bilateral Temporal Lobes Modulates Hippocampal-Occipital Functional

Weizhen Xie1, Sanikaa Thakurdesai1, Sahereh Varastegan2

  • 1Department of Psychology, University of Maryland, College Park, Maryland, USA.

Hippocampus
|December 23, 2024
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Summary
This summary is machine-generated.

Transcranial direct current stimulation (tDCS) over the temporal lobe reduced visual short-term memory (VSTM) precision by altering functional connectivity between the medial temporal lobe (MTL) and visual areas. This modulation occurred even during rest, impacting memory quality.

Keywords:
fMRImedial temporal lobepattern separationprecisiontDCSvisual short‐term memory

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • The medial temporal lobe (MTL) is traditionally linked to long-term memory.
  • Emerging evidence suggests MTL involvement in visual short-term memory (VSTM) precision.
  • Investigating MTL's role in VSTM precision requires advanced neurostimulation and imaging techniques.

Purpose of the Study:

  • To investigate the medial temporal lobe's (MTL) role in visual short-term memory (VSTM) precision.
  • To examine the effects of transcranial direct current stimulation (tDCS) on VSTM precision and associated brain activity.
  • To explore how tDCS modulates functional connectivity within memory and visual processing networks.

Main Methods:

  • Participants received offline tDCS (1.5 mA) over bilateral temporal lobes (left cathodal, right anodal) or sham stimulation.
  • A VSTM color recall task was performed during functional magnetic resonance imaging (fMRI) post-tDCS.
  • Psychophysiological interaction (PPI) analysis examined task-based and resting-state functional connectivity.

Main Results:

  • tDCS decreased VSTM precision but did not affect overall recall success.
  • tDCS modulated hippocampal-occipital functional connectivity during the VSTM task.
  • Connectivity modulation persisted during resting-state fMRI and correlated with behavioral changes in VSTM precision.

Conclusions:

  • tDCS over the temporal lobe can alter VSTM precision.
  • The findings suggest modulation of intrinsic functional connectivity between MTL and visual sensory areas.
  • This modulation impacts the quality of information retained in VSTM.