Arousal dysregulation and executive dysfunction in attention deficit hyperactivity disorder (ADHD)

Area of Science:

• Neuroscience
• Developmental Psychology
• Psychiatry

Background:

• Attention deficit/hyperactivity disorder (ADHD) presents a heterogeneous neurodevelopmental profile with an unclear etiology.
• Existing models, such as the executive dysfunction theory, link ADHD to dopaminergic signaling abnormalities, but this doesn't fully explain all symptoms.
• The state regulation theory, incorporating autonomic function, proposes dysregulated brain arousal states as a cause for ADHD's cognitive and behavioral deficits.

Purpose of the Study:

• To critically evaluate the empirical evidence supporting the executive dysfunction and state regulation theories of ADHD.
• To highlight the limitations and inconsistencies within current theoretical constructs for ADHD.
• To underscore the necessity for revising ADHD diagnostic criteria based on neurophysiological factors.

Main Methods:

• Literature review and theoretical analysis of existing research on ADHD.
• Comparison of empirical evidence for executive dysfunction and state regulation models.
• Examination of the implications of theoretical inconsistencies for ADHD diagnosis and treatment.

Main Results:

• Neither executive dysfunction nor state regulation theory fully accounts for the heterogeneity of ADHD symptoms.
• Contradictory findings persist regarding biological and performance markers for ADHD.
• Current diagnostic norms may not adequately capture the underlying neurophysiological variability in ADHD.

Conclusions:

• Reevaluation of ADHD diagnostic criteria is crucial for accurate identification of underlying neurophysiological factors.
• Revised diagnostic approaches are essential for optimizing therapeutic success in ADHD treatment.
• Further research is needed to reconcile conflicting findings and refine ADHD theoretical frameworks.