Neurons send electrical signals through nerve fibers to the posterior cortex

The mental synthesis theory proposes that like a puppeteer pulling the strings,the prefrontal cortex neurons send electrical signals
down these neural fibers to multiple ensembles
in the posterior cortex.This activates them in unison.If the neuronal ensembles are turned on at the same time,you experience the composite image just as if you'd actually seen it.This conscious purposeful synchronization of different neuronal ensembles
by the prefrontal cortex is called mental synthesis.In order for mental sythesis to work,signals would have to arrive at both
neuronal ensembles at the same time.