Effects of amphetamine on vigilance performance in normal and hyperactive children

Area of Science:

• Neuroscience
• Child Psychology
• Pharmacology

Background:

• Deficient sustained attention is a hallmark of hyperactivity, often responsive to stimulant medication.
• Amphetamines have demonstrated potential in improving vigilance task performance in both typical and hyperactive children.

Purpose of the Study:

• To investigate the effects of amphetamine on vigilance performance in hyperactive and normal boys across different age groups.
• To apply signal detection analysis to quantify changes in perceptual sensitivity and response bias.

Main Methods:

• A computerized continuous performance test was used to assess vigilance.
• Participants included 15 hyperactive and 14 normal boys, divided into age groups (6-9 and 10-12 years).
• Performance was evaluated under both amphetamine and placebo conditions.

Main Results:

• Normal boys and older children exhibited higher perceptual sensitivity (d').
• Amphetamine significantly increased perceptual sensitivity (d') across all participants.
• Amphetamine had a more pronounced effect on younger boys' perceptual sensitivity and response bias compared to older boys.

Conclusions:

• Amphetamine enhances sustained attention and perceptual sensitivity in boys, irrespective of hyperactivity status.
• Age moderates the effects of amphetamine on vigilance, with younger children showing greater sensitivity to the drug's impact.
• Signal detection analysis provides a robust method for evaluating stimulant effects on attention.