It is important to understand the neurobiological,
cognitive, and behavioral factors that underlie ADHD
and the ADHD subtypes. It has often been
hypothesized that the ADHD-Combined Type (ADHD-CT)
and ADHD-Predominantly Inattentive Type (ADHD-PI)
subtypes may be the result of different underlying
factors and may be associated with different types
of attentional deficits. This work is an attempt to
examine possible ADHD subtype differences by testing
hypothoses based on cognitive theories of attention,
research findings on the neurobiology of attention
and ADHD, as well as previous research findings on
and theories of ADHD subtyping. The attentional
processes discussed in this work include response
activation, sustained attention, encoding/working
memory, the focus/execute aspect of attention, and
attentional stability.
cognitive, and behavioral factors that underlie ADHD
and the ADHD subtypes. It has often been
hypothesized that the ADHD-Combined Type (ADHD-CT)
and ADHD-Predominantly Inattentive Type (ADHD-PI)
subtypes may be the result of different underlying
factors and may be associated with different types
of attentional deficits. This work is an attempt to
examine possible ADHD subtype differences by testing
hypothoses based on cognitive theories of attention,
research findings on the neurobiology of attention
and ADHD, as well as previous research findings on
and theories of ADHD subtyping. The attentional
processes discussed in this work include response
activation, sustained attention, encoding/working
memory, the focus/execute aspect of attention, and
attentional stability.