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Visual and auditory steady-state responses in attention-deficit/hyperactivity disorder
Ali Khaleghi1, Hadi Zarafshan2, Mohammad Reza Mohammadi2
1Psychiatry and Psychology Research Center, Tehran University of Medical Sciences, Tehran, Iran. alikhaleghi_bme84@yahoo.com.
Summary
Adolescents with ADHD show poorer motor control and altered brain responses (SSVEP, ASSR) during inhibition tasks, suggesting neural deficits in attention and motor systems.
Area of Science:
- Neuroscience
- Developmental Psychology
- Clinical Psychology
Background:
- Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterized by inattention and hyperactivity.
- Motor response inhibition is frequently impaired in individuals with ADHD.
- Understanding the neurophysiological underpinnings of these deficits is crucial for targeted interventions.
Purpose of the Study:
- To investigate steady-state visual evoked potential (SSVEP) and auditory steady-state response (ASSR) patterns in adolescents with ADHD during a motor response inhibition task.
- To compare neurophysiological responses between adolescents with ADHD and healthy controls.
Main Methods:
- Electroencephalogram (EEG) was used to record SSVEP and ASSR in 30 adolescents with ADHD and 30 healthy controls (aged 12-18).
- Participants performed a stop-signal task under steady-state visual and auditory stimulation.
- Amplitude and phase of SSVEP and ASSR were analyzed.
Main Results:
- Adolescents with ADHD exhibited significantly poorer performance on the stop-signal task under both visual and auditory conditions.
- The ADHD group showed larger SSVEP amplitudes across most brain regions compared to controls.
- The ADHD group displayed smaller ASSR amplitudes in certain brain regions, particularly the right hemisphere.
Conclusions:
- Poorer task performance and distinct neurophysiological patterns in ADHD suggest impaired connectivity between association cortices (parietal, temporal, prefrontal) and frontoparietal/occipitoparietal systems.
- Motor control deficits in ADHD may stem from neural impairments in these interconnected brain networks, including the cerebellum.
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