All diagrams in overview and genetic evidence
Whole system overview
How do biology and context connect to cognitive function? This is an organising model, not one ADHD formula or a diagnostic graph.
Whole system overview
An organising framework

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Read the diagram explanation and sources
Read from genes and regulation through development, precursor supply, cellular energy, synaptic communication and brain circuits to cognitive performance. Sleep, stress and environment are additional inputs. The connecting arrows organise relationships for learning; they do not demonstrate one causal chain, one defect shared by everybody with ADHD or a diagnostic test.
What the diagram shows
Read from genes and regulation through development, precursor supply, cellular energy, synaptic communication and brain circuits to cognitive performance. Sleep, stress and environment are additional inputs. The connecting arrows organise relationships for learning; they do not demonstrate one causal chain, one defect shared by everybody with ADHD or a diagnostic test.