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Related Experiment Video

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Methods for the Modulation and Analysis of NF-κB-dependent Adult Neurogenesis
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α -tACS Modulates Reward-Dependent Pupil Responses and Corticostriatal Connectivity.

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  • 1Temple University, Philadelphia, PA, USA.

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Noninvasive brain stimulation of the ventrolateral prefrontal cortex (VLPFC) influences reward processing by modulating arousal and corticostriatal networks. This approach offers a new way to study and potentially treat reward dysfunction.

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Concurrent Electroencephalography Recording During Transcranial Alternating Current Stimulation tACS
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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Psychology

Background:

  • Noninvasive brain stimulation aids in understanding neural mechanisms of reward processing.
  • Current methods like TMS and tES struggle to reach deep brain regions such as the striatum.
  • The ventrolateral prefrontal cortex (VLPFC) has strong connections to the striatum, suggesting potential for indirect modulation.

Purpose of the Study:

  • To investigate if stimulating the VLPFC can indirectly influence neural and physiological responses related to reward processing.
  • To examine the effects of transcranial alternating current stimulation (α-tACS) on reward-related activity and connectivity.

Main Methods:

  • Participants underwent a card-guessing task with monetary rewards/punishments.
  • Concurrent functional magnetic resonance imaging (fMRI) and pupillometry were used during α-tACS targeting VLPFC or a control region.
  • Measurements included pupil dilation, brain activation (BOLD), and ventral striatum-dorsal anterior cingulate cortex (VS-dACC) functional connectivity.

Main Results:

  • VLPFC stimulation increased pupil dilation during both reward and punishment, indicating heightened physiological arousal.
  • α-tACS modulated VLPFC activity, enhancing it during reward and suppressing it during punishment.
  • Stimulation altered VS-dACC connectivity context-dependently, with changes correlating with pupil dilation.

Conclusions:

  • Targeting VLPFC with α-tACS effectively modulates local cortical activity and corticostriatal networks during reward processing.
  • This provides a promising noninvasive method for influencing reward circuitry.
  • Findings link brain activity, connectivity, and autonomic responses in reward processing.