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These echoes heavily distort speech, interfering with slowly varying sound features most important for understanding conversations, yet people still reliably understand echoic speech.

Maybe you should check to see if it’s dark and echoic around you, to confirm whether or not you're living under a rock.

Audiobooks, by contrast, exploit our “echoic memory”, which is the process by which sound information is stored for up to four seconds while we wait for the next sounds to make sense of the whole.

It was a brilliant solution: as Lennon’s voice faded into the echoic distance, the orchestra began its buildup, ending sharply on the chord that begins Mr. McCartney’s section.

First recorded around 970, its roots are in Old English and it offers a satisfactorily echoic thumping sound.