 The subject hears the sound as coming from such-and-such a position, but how is the position to be specified? Presumably in egocentric terms (he hears the sound as up, or down, to the right or to the left, in front or behind). These terms specify the position of the sound in relation to the observer’s own body; and they derive their meaning in part from their complicated connections with the subject’s actions. (Evans 1982: 155)