Visual slow brain potentials in children with attention deficit disorder

Area of Science:

• Neuroscience
• Developmental Psychology
• Clinical Psychology

Background:

• Attention deficit disorder (ADD) is a prevalent neurodevelopmental disorder.
• Previous research suggests differences in brain activity between children with ADD and controls.
• Slow wave brain potentials (ERPs) are sensitive measures of cognitive processing.

Purpose of the Study:

• To investigate differences in slow wave brain potentials (ERPs) between children with ADD and normal controls.
• To examine the impact of reward conditions (contingent vs. noncontingent) on ERPs in these groups.
• To identify ERP markers associated with aggressive and hyperactive subtypes of ADD.

Main Methods:

• A two-stimulus reaction time paradigm was employed.
• Electroencephalography (EEG) was used to record slow wave brain potentials (ERPs).
• 144 children with ADD and 30 normal control children participated across contingent and noncontingent reward conditions.

Main Results:

• Group differences in ERPs were observed specifically during the contingent reward condition.
• Aggressive hyperactive ADD subjects showed greater fronto-central and right parietal negativity compared to nonaggressive subjects.
• All ADD subgroups exhibited greater slow wave negativity at the occipital electrode site during contingent reward compared to controls.

Conclusions:

• Slow wave brain potential differences are linked to attentional problems in children with ADD.
• Findings support a psychobiological model of inhibition/disinhibition and appetitive activation.
• ERPs during contingent reward tasks may serve as indicators of attentional deficits in ADD.