The limited capacity of immediate memory "rides" on the even more limited c
apacity of consciousness, which reflects the dynamic activity of the thalam
ocortical core of the brain. Recent views of the conscious narrow-capacity
component of the brain are explored with reference to global workspace theo
ry (Baars 1988; 1993; 1998). The radical limits of immediate memory must be
explained in terms of biocognitive brain architecture.