Thanks for posting this. A detective told me about the up-left and up-right bit before, but I hadn't heard about the sound memories and "internal dialogue" Makes sense. Eyes want to flip up(towards frontal lobes) for general thought, sideways toward ears for sounds, and down towards "self"(most all of the body being lower than the eye). Left side logic and right side creative.   And want to point out the "clues" part of the clip's title, and the speaker's stressing that these motions "tend to be" indicators. Keep that in mind. Remember your environment. The subject may be glancing at something behind you, especially if you're outdoors and there's anything in motion like people walking or cars going by. Even in a room they may be just looking at a clock on the wall or something. Yyou want to ask the same questions in different ways and see if the responses are consistent.