A fascinating study by Laurent, Ensslin and Mari-Beffa (2015) entitled, An action to an object does not improve its episodic encoding, but removes distraction, illustrates the potentially double-edged nature of gesture. Without getting into the somewhat complex but innovative research design, what they discovered is that gesture accompanying focus on an object did not enhance episodic memory for the object and the context or surroundings but did strongly curtail distraction. evident in the diminished memory for other elements of the event. (Think of episodic memory as basically potential recall of emotional setting plus the 5 "W"s: who, what, where, why and when of a happening.)
In other words, gesture accompanying a phrase, for example, should at least cut back on distracting features of the moment or context . . . but, other than that, it may not be adding much to the mix. It may be actually working against you.
At first glance, that may appear to at least to some extent undermine use of gesture in teaching. It does, in fact. Haptic pronunciation teaching, which uses gesture anchored by touch on stressed elements, is based on the principle that gesture that is not carefully controlled and focused with touch is "a wash" . . . it may or may not work. Over enthusiastic gesture use, for example, may not only turn off many of the students, compounded by cultural differences, but, in effect, it can be so distracting in itself that the language focus is lost entirely.
It took me a couple of decades of working with kinesthetic pronunciation teaching techniques to figure that out. That insight came basically in the form of wildly divergent reports and feedback on gesture effectiveness by classroom teachers. Pronunciation teachers are generally by nature more "gesticular", often highly energetic and "moving" speakers. Perhaps you have to be in many contexts just to motivate students and maintain their attention, but it can, indeed, be our Achilles Heel. Is it yours?
If so, get in touch (either with us or your local yoga, Alexander Technique, Lessac practitioner or Tai Chi shop!)
Laurent, X.; Ensslin, A. and Mari-Beffa, P. (2015) An action to an object does not improve its episodic encoding, but removes distraction. Journal of Experimental Psychology: Human Perception and Performance 44(1), 244.