What survives
Most of it, with effect sizes attached. Rumination as a prospective predictor, behavioural activation as a treatment, and cognitive restructuring for anxiety are all supported by large controlled literatures.
What does not
Nothing wholesale, but two cautions the volume prints rather than hides. The polyvagal vocabulary for freeze and shutdown is contested at the physiological level even where it is clinically useful. And insight alone — recognising a pattern without practising anything different — reliably changes very little.
Hofmann, Asnaani, Vonk, Sawyer and Fang (2012)
Cognitive Therapy and Research 36(5) · 269 meta-analyses reviewed
Tested Efficacy of cognitive behavioural therapy across disorders, review of 269 meta-analyses
Found Strongest support for anxiety disorders, somatoform disorders, bulimia, anger control and general stress; effects moderate and consistent
Since This is the review of reviews
Nolen-Hoeksema (1991)
Journal of Abnormal Psychology 100(4)
Tested Whether ruminative response style prospectively predicts depression
Found Yes — rumination predicts onset and duration rather than merely accompanying them
Since Extensively; one of the more durable findings in clinical psychology
Cuijpers, van Straten and Warmerdam (2007)
Clinical Psychology Review 27(3) · 780 participants across 16 trials
Tested Behavioural activation for depression, meta-analysis of 16 trials
Found Large effect versus control; comparable to full cognitive therapy
Since Yes, including in later larger non-inferiority trials
Various (2023)
Biological Psychology and commentary literature
Tested The physiological claims of polyvagal theory
Found The clinical vocabulary is widely used; several of the theory's specific evolutionary and anatomical claims are disputed by comparative physiologists
Since The dispute is live, and this volume flags it wherever it uses the vocabulary
What would change this rating
This is the rung the evidence supports today. It would fall if the CBT literature failed to replicate under pre-registration, which so far it has largely withstood.
A rating that no possible finding could
alter is an opinion. Every volume names the result that
would move it.