J Korean Acad Child Adolesc Psychiatry.  2011 Dec;22(4):211-218.

Auditory and Visual P300 in ADHD Children with Higher and Lower IQ : Pilot Study

Affiliations
  • 1Department of Psychiatry, Incheon St. Mary's Hospital, The Catholic University of Korea, Incheon, Korea. zahir@catholic.ac.kr

Abstract


OBJECTIVES
Intellectual impairment in children with attention-deficit hyperactivity disorder (ADHD) is often associated with relatively severe cognitive dysfunction. This study was designed to investigate cognitive function using auditory and visual event-related potential P300 in children with ADHD with relatively higher and lower IQ.
METHODS
A total of 20 children aged 6-12 years with DSM-IV-TR diagnosis of ADHD-combined type were recruited. For 10 children with lower IQ (< or =100) and 10 children with higher IQ (>100), auditory and visual P300 using oddball paradigm (target 0.2, standard 0.8, in probability) were employed.
RESULTS
No significant differences were found in P300 amplitude and latency between ADHD children with higher and lower IQ in both modalities. However, auditory P300 amplitude in the right parietal area (P8 electrode) was negatively correlated with verbal IQ in ADHD subjects (R=-.50, p<.05). Visual P300 amplitude in the left parietal area (P3 electrode) was positively correlated with performance IQ in ADHD subjects (R=.57, p<.01).
CONCLUSION
This study suggests intellectual impairment, as evidenced by lower IQ, could not be associated with cognitive dysfunction reflected in event-related potential P300 in ADHD children. However, cognitive function reflected in intellectual subcomponents and P300 might be processed in a stimulus modality-specific and asymmetric pattern.

Keyword

Attention-Deficit Hyperactivity Disorder; Cognition; P300

MeSH Terms

Aged
Child
Cognition
Evoked Potentials
Humans
Pilot Projects
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