When you know a person so much, that you can hear their voice in your head, even if they never said that word or sentence
Echoic memory is one type of sensory memory process. Specifically, echoic memory is sensory memory associated with auditory information received from the environment. The term echoic stems from the word echo, which is in reference to the brief echo, or the reverberation of sound that is transmitted neurologically via this type of sensory memory.
by Meow_Kat January 11, 2016