Attention Deficit Hyperactivity Disorder T. FISHER, H. PRATT and J. AHARON Evoked Potentials Laboratory Technion-Israel Institute of Technology, Haifa,

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Attention Deficit Hyperactivity Disorder

Presentation transcript:

Attention Deficit Hyperactivity Disorder T. FISHER, H. PRATT and J. AHARON Evoked Potentials Laboratory Technion-Israel Institute of Technology, Haifa, Israel

The three main symptoms of ADHD Inattention Impulsivity Hyperactivity

What are the brain processes associated with the behavioral impulsivity symptoms?

Subjects  14 subjects diagnosed with Attention Deficit and Hyperactivity disorder.  14 healthy control subjects matched for age and gender  Age range: No co-morbidity of psychiatric, neurological or learning disabilities.  All subjects were free of medication.

Procedure Stimuli: 2 binaural tones: 1000 Hz (NO-GO) 2000 Hz (GO) 60 dBnHL for 40 ms. Inter-trial interval: 1000 to 2000 ms Task: To GO trials: press button to stimuli. Probability: 80%. To NO-GO trials: inhibit the response. Probability: 20%.

GO NO-GO Behavioral Results

Electrophysiological results grand average, 28 subjects, midline electrodes µV 300Msec Control subjectsADHD subjects GO NO-GO P3 N2 P3 N2 P3 N2

ADHD vs. CTRL in NO-GO Trials CTRL ADHD µV 300Msec

Control > ADHD LORETA images of Control – ADHD difference ADHD Control µV 300msec No go, significant voxels, P< msec stimulus R. Inf. frontal gyrus BA 9, 44,45

Posterior Cingulate BA 23,29,30,31 LORETA images of significant T values ADHD Control µV 300Msec No go, significant voxels, P< Msec stimulus Control > ADHD

Conclusions The ADHD deficit is in stimulus-related processing, not at the perceptual level. ADHD show abnormal activity in brain regions attributed to response inhibition and conflict monitoring.

CTRL N2 ADHD N2 N2

ADHD P3 CTRL P3