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Amphetamines modulate prefrontal γ oscillations during attention processing.

John D Franzen1, Tony W Wilson

  • 1Department of Psychiatry, University of Nebraska Medical Center, Omaha, Nebraska, USA.

Neuroreport
|July 11, 2012
PubMed
Summary
This summary is machine-generated.

Amphetamine medications improve attention-deficit/hyperactivity disorder (ADHD) symptoms by modulating gamma-band brain activity. This study shows amphetamines alter high-frequency oscillations in key frontal and parietal attention networks.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Cognitive Science

Background:

  • Amphetamine medications are effective for attention-deficit/hyperactivity disorder (ADHD) but their precise neural mechanisms are unclear.
  • Previous research suggests amphetamines may affect prefrontal and anterior cingulate regions, with inconsistent findings.
  • Abnormalities in gamma (γ) band oscillations are linked to ADHD symptoms like inattention.

Purpose of the Study:

  • To investigate how amphetamines modulate high-frequency brain activity (γ-band oscillations) in adults with ADHD.
  • To examine the effects of amphetamines on brain activity during an auditory attention task.

Main Methods:

  • Magnetoencephalography (MEG) was used to measure brain activity in adults with ADHD.
  • Participants performed an auditory attention task in both on-medication and off-medication states.
  • Beamforming techniques analyzed event-related synchronizations and desynchronizations in the γ-band.

Main Results:

  • Amphetamine administration significantly decreased γ-band event-related desynchronization in the medial prefrontal cortex.
  • Amphetamines also reduced γ-band event-related synchronization in parietal and frontal cortical areas.
  • These changes were observed in the superior parietal, inferior parietal, and inferior frontal gyri.

Conclusions:

  • Psychostimulants like amphetamines strongly modulate γ-band activity in frontal and parietal cortical regions.
  • These brain areas are critical components of the neural networks supporting attention.
  • Findings provide insights into the neurophysiological effects of amphetamines in ADHD treatment.