Switch in tube-use techniques from “dipping” to “straw-sucking”.

Note: Individual: condition where each participant was tested individually; Paired: condition where each participant was tested with the conspecific “straw-sucking” demonstrator (1: together in a booth with two juice bottles; 2: separated in two adjacent booths each equipped with a juice bottle); D: “dipping” technique; S: “straw-sucking” technique; “DS”: firstly “dipping” technique, and then “straw-sucking” technique after observing the demonstrator's straw-sucking; -: no try; trials highlighted in grey indicate that a participant observed the demonstrator's “straw-sucking” within a distance of 50 cm.