From the abstract: "This paper presents a theory...to explain a possible mode of action of spinal manipulation in some patients with...visual disorders, dizziness, depression, anxiety, memory problems, attention span problems, difficulty with concentration, irritability, tired-ness, and clumsiness." Terrett builds on the findings of Gorman and others to advance the theory that diminished blood flow to the brain causes some areas to "hibernate" that is, remain alive, but not function, resulting in diminished mental capacity. "I'm sure that this is exactly what happens to many people every day, and that this is why they suffer problems such as tiredness, headache, depression, irritability, difficulty concentrating, visual difficulty, etc.etc." (Letter to the editor, Chiropractic Technique, Vol.6 No.3, Aug. 1994).
Terrett AGJ. Chiropractic Technique; 1993; 5:168-173.