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Dopamine-induced changes in neural network patterns supporting aversive conditioning.

Andreea Oliviana Diaconescu1, Mahesh Menon, Jimmy Jensen

  • 1Rotman Research Institute, Baycrest Centre for Geriatric Care, Toronto, Ontario, Canada. adiaconescu@rotman-baycrest.on.ca

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Altered dopamine transmission affects brain connectivity during aversive conditioning. Amphetamine enhanced connectivity in DA-modulated regions, while haloperidol altered networks involving the amygdala and prefrontal cortex.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Psychopharmacology

Background:

  • Dopamine (DA) plays a crucial role in learning and memory, particularly in processing reward and aversion.
  • Understanding how DA transmission influences functional brain connectivity during aversive conditioning is vital for comprehending emotional regulation and related disorders.

Purpose of the Study:

  • To investigate the impact of modulated dopamine transmission on functional connectivity within brain networks associated with aversive conditioning in humans.
  • To compare the effects of an indirect DA agonist (amphetamine) and a DA D2 receptor antagonist (haloperidol) against a placebo on these brain networks.

Main Methods:

  • Utilized functional magnetic resonance imaging (fMRI) data from a double-blind study with healthy volunteers receiving amphetamine, haloperidol, or placebo.
  • Employed an aversive classical conditioning paradigm with visual cues (CS+, CS-) and electrical stimulation (US).
  • Analyzed functional connectivity using the ventral striatum (VS) and amygdala as seed regions, correlating with Galvanic Skin Response (GSR) to isolate conditioned responses.

Main Results:

  • Placebo group showed connectivity between VS/amygdala and regions like VTA/SN, caudate, and PFC during aversive conditioning.
  • Amphetamine administration resulted in reduced task differences and altered connectivity between the left VS and DA-modulated regions (e.g., VTA/SN, amygdala, PFC).
  • Haloperidol treatment led to significant functional connectivity between the amygdala and a distinct network including the insula, ACC, IPL, and SMA.

Conclusions:

  • Dopamine transmission significantly modulates functional brain connectivity during aversive conditioning.
  • Amphetamine and haloperidol exert distinct effects on striatal, limbic, and prefrontal network connectivity.
  • These findings offer insights into the neurobiological mechanisms underlying DA's role in emotional learning and processing.