In cognitive psychology, the phonological buffer refers to a passive storage system for holding representations (an “internal echo” of recently heard and/or self-produced sounds (Reisberg, 2018). In neuroscientific terms, the phonological buffer (as one of two hypothetical units of the phonological loop) is believed to reside in the left hemisphere, in the lateral and anterior regions of the brain (Rahm, 2018).
Reisberg, D. (2018). Cognition: Exploring the Science of the Mind. 7th Edition. New York: W. W. Norton & Company.