David B. Bylund

Publications (2)2.52 Total impact

• Article: Platelet MAO and measures of attention and impulsivity in boys with attention deficit disorder and hyperactivity

  Walid O. Shekim, David B. Bylund, Joyce Alexson, Robert D. Glaser, Susan B. Jones, Kay Hodges, Sondra Perdue
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  ABSTRACT: Platelet monoamine oxidase (MAO) activity was studied in 22 boys diagnosed as having attention deficit disorder with hyperactivity and 12 healthy control boys admitted to a clinical research center and placed on a diet low in monoamines. The hyperactive boys had lower platelet MAO activity than controls, and MAO activity was related to performance on the Matching Familiar Figures Test (MFF) and the Continuous Performance Test (CPT), which yield scores sensitive to impulsivity and inattention. Furthermore, it was negatively related, in hyperactive boys only, to two tests of reading and spelling achievement. Administration of d-amphetamine and placebo in a double-blind crossover design did not significantly raise MAO levels above baseline and was minimally related to improved performance on the MFF and CPT.
  Psychiatry Research 07/1986; · 2.52 Impact Factor
• Article: Psychoeducational and impulsivity correlates of platelet MAO in normal children

  Walid O. Shekim, Kay Hodges, Ellen Horwitz, R.D. Glaser, Lenny Davis, David B. Bylund
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  ABSTRACT: The authors examined the relationship between the activity of platelet monoamine oxidase (MAO) and a variety of psychoeducational measures, as well as the scores on the Matching Familiar Figures Test (MFF), a psychological test of reflection-impulsivity, in 21 normal children (12 boys, 9 girls) who were admitted to a clinical research center and placed on a low monoamine diet. The children were divided into three equal groups (n=7) based on their values of platelet MAO. There were no significant differences among the three groups in the psychoeducational measures. However, the high and low MAO groups made significantly more errors and had shorter latency periods on the MFF than the middle MAO group. These findings suggest that normal children with platelet MAO activity values in the high and low ends of the MAO distribution are more impulsive than the children with platelet MAO values in the middle range on the MFF Test of Impulsivity. The findings further suggest that there is no relationship between platelet MAO levels and intellectual abilities or scholastic achievement in normal children.
  Psychiatry Research.