More broadly, we observed that the grip choices for holding the first object in place were highly variable and linked to specific object combinations.

These included finger-finger (FF) and finger-palm (FP) opposition, as well as a range of Other (O) grips that were highly unusual (e.g., fingers opposing themselves, objects placed within a palmar crease).

In this project we presented participants with pairs of everyday objects. They were asked to grasp one of the objects and then, with the first still in hand, grasp the second and transport both.