Dr. Daniel Amen opens by challenging standard psychiatric practice, arguing that broad diagnostic categories often mask genuinely distinct underlying brain patterns that look similar on the surface but require different treatment approaches.

Why this individualized approach matters:

• Two patients diagnosed with the same condition (like depression) may show very different underlying brain activity patterns
• Treating both with the same standard protocol may work for one and fail for the other, despite the shared diagnostic label
• Amen argues for individualized assessment before treatment, rather than relying purely on symptom-based diagnostic categories

This opening establishes the book's central methodology: using brain imaging to individualize treatment recommendations beyond standard diagnostic categories alone.