The central executive seems to have TOO MANY DIFFERENT TASKS TO BE A SINGLE, UNITARY COMPONENT in working memory.
It seems unlikely that one component could be involved in controlling all of these tasks.
For example, tasks such as attention, problem solving, setting goals and checking errors TASKS ARE SO DIFFERENT, AND SO LIKELY TO INVOLVE A RANGE OF DIFFERENT CIRCUITS IN THE BRAIN.
It is not clear whether the phonological loop is JUST FOR LANGUAGE, or whether it processes OTHER SOUNDS.
For example, music without lyrics doesn't often interfere much with our attempts at verbal rehearsal. So IS THERE A SEPARATE LOOP FOR MUSIC?