Neurological Basis
Auditory sensory memory has been found to be stored in the primary auditory cortex contralateral to the ear of presentation. This echoic memory storage involves several different brain areas, due to the different processes it is involved in. The majority of brain regions involved are located in the prefrontal cortex (PFC) as this is where the executive control is located, and is responsible for attentional control. The phonological store and the rehearsal system appear to be a left-hemisphere based memory system as increased brain activity has been observed in these areas. The major regions involved are the left posterior ventrolateral prefrontal cortex (VLPFC), the left premotor cortex (PMC), and the left posterior parietal cortex (PPC). Within the VLPFC, Broca’s area is the main location responsible for verbal rehearsal and the articulatory process. The dorsal PMC is used in rhythmic organization and rehearsal, and finally the PPC shows a role in localizing objects in space.
The cortical areas in the brain believed to be involved with auditory sensory memory exhibited by MMN response have not been localized specifically. However results have shown comparative activation in the superior temporal gyrus (STG) and in the inferior temporal gyrus (ITG).
Read more about this topic: Echoic Memory
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