A speechreading expert: The case of MM

The present case study of MM, who acquired both sign language and spoken la nguage in her early preschool years-and then reached the normal milestones Of development in each language-revealed that her speechreading expertise i s associated with cognitive Functions such as high working memory capacity and phonological skills. Her cognitive profile is in accord with previous c ase studies of extremely good speechreading skill. MM's enhanced right pref rontal/frontal cerebral blood Flow activation during speechreading seems to be indicative of efficient visual scanning, but it is also possibly due to her strategy for phonological decoding of visual speech.