in another report of the same experiment ( Rumsey et al ., 1999 ), these authors show that activation in only one region, the left angular gyrus, was correlated with reading skill, and that the direction of this correlation was opposite in controls (positive) and dyslexics (negative correlation). They conclude from this result that the left angular gyrus is `the most probable site of a functional lesion in dyslexia'. With fMRI, using imaging parameters that were not optimal (9-mm thick slices, 17 regions of interest `that previous research had implicated in reading and language'), Shaywitz and colleagues proposed to 29 dyslexics and 32 controls a complete series of tasks tapping various levels of processing in reading: a line orientation judgement task, presumably exploring low-level perceptual mechanisms; a letter-case judgement, presumed to reflect orthographic mechanisms; a single letter rhyme and a non-word rhyme task, exploring the phonological level of processing; and a semantic category judgement task ( Shaywitz et al ., 1998 ). The main result was that in normals there was relative overactivation with phonological tasks (in comparison with orthographic ones) in posterior regions [posterior temporal, Brodmann area (BA) 21; supramarginal and angular gyri, BA 39 and 40; and inferior lateral temporal region, BA 37], and a reversed pattern (greater anterior than posterior activation when contrasting phonological and orthographic processing) in dyslexics. The authors propose a general explanation for posterior hypoactivation in dyslexics, that it is `due to actual disruption in a system in charge of phonological processes', whereas Broca's