By Mona Sakr

A few days ago, I talked about Streeck’s taxonomy of gesture in Gesturecraft. It’s now time to share the taxonomy of hand action we’ve developed at the lab in response to a study of the hands in scientific inquiry. This taxonomy relates particularly to scientific inquiry contexts (though it may be useful for looking at hand action in other forums of experience) and is based on ‘reading’ both the form and function of hand actions. It’s inspired by literature in the field and video analysis of students involved in inquiry learning about the behaviour of light.

1.     Ergotic movements

Ergotic movements are those that change the surrounding environment . Such movements may involve changing the position of an object, or attempting to change its physical properties. In the context of scientific inquiry, ergotic movements are necessary in order to facilitate observations of particular phenomena.

2.     Epistemic movements

Epistemic movements are those that enable an individual to know more about the physical properties of an object. While ergotic movements are designed to change the surrounding environment, epistemic movements enable better perception of the surrounding environment e.g. through feeling the texture of an object.

3.     Deictic gesture

Deictic gestures are used to point to or physically highlight objects or areas in the physical world. They may be used to draw attention to a representational field or a particular aspect within a field.

4.     Re-enactment gestures

While deictic gestures draw attention to particular parts of the environment, re-enactment gestures focus on descriptive processes and so have an added temporal dimension of expression. Through using re-enactment gestures processes that are otherwise too fast to be visible can be slowed down.

5.      Ideational gestures

While all of the actions described above relate to physical phenomena that are present, ideational gestures can be used to indicate content that is not present in any respect, like abstract ideas or previous experiences. In the context of scientific inquiry, students may wish to invoke previously learned knowledge in order to make sense of what is currently occurring. Gesture may be helpful in this because it constitutes a way of representing absent knowledge.