ABSTRACT
Deep dyslexia is a profound reading disorder that is most commonly seen following widespread damage to the left side of the brain (acquired deep dyslexia) and is also occasionally observed in individuals with no clear brain pathology (developmental deep dyslexia). The theory that right-hemisphere processes are responsible for the symptoms observed in acquired deep dyslexia (Coltheart, 1980b; Saffran, Bogyo, Schwartz, & Marin, 1980) has been supported by functional imaging studies (Coltheart, 2000; Price, Howard, Patterson, Warburton, Friston, & Frackowiak, 1998; Weekes, Coltheart, & Gordon, 1997) but the possibility of right-hemisphere involvement in developmental deep dyslexia has not been explored (Johnston, 1983; Siegel, 1985; Stuart & Howard, 1995; Temple, 1988, 2003; Yamada, 1995).
