Echoic memory is one of the sensory memory registers; a component of sensory memory (SM) that is specific to retaining auditory information.The sensory memory for sounds that people have just perceived is the form of echoic memory.his particular sensory store is capable of storing large amounts of auditory information that is only retained for a short period of time (3–4 seconds). This echoic sound resonates in the mind and is replayed for this brief amount of time shortly after the presentation of auditory stimuli.