Fig. 2

Overview of the experimental tasks and the corresponding feedback information communicated to the users (annotations on the right). The tasks are sorted in the order of increasing complexity, which was also how they were introduced to the subjects during the multisession experimental protocol (see section 2.4). (A) Standardized Box and Blocks Task (BOX), where the task was to transfer as many blocks as possible in 60 s from left (A1) to right (A2) compartment; (B) Cups Relocation Task (CUP) where the subjects needed to lift and pick up, one by one, 10 cups from the ipsilateral stack (B1) and transfer them, without dropping, to the contralateral stack (B2); (C) Block Turn Task (TURN) where the subjects needed to perform a set of dexterous actions (C2) manipulating the wooden block; and (D) Clothespin Relocation Task (PIN), containing “breakable” clothespins that lit up (D2) when the force exerted on them was excessive. The subjects’ task was to remove each of the four differently colored clothespins from the horizontal bar and place them on the vertical bar without “breaking” or dropping them (D1)