2.2.1. Procedure

Participants began the experiment with both hands on the table. The experimenter then activated the handle of the jug (using the Blynk app as described previously). The jug's handle then rose from the side of the jug. When the handle was fully raised, the LED strip on the top of the jug turned on dimly and a timer began. If the jug had not been picked up after three seconds, the LED strip turned on at full brightness. If the jug had not been picked up after six seconds, the LED strip flashed and the audio prompt of "Pick me up" was played. Once the jug had been picked up (determined by the FSR going to zero), the timer stored this time and reset. Once the participant had picked up the jug, a cup lit up and the audio prompt "pour me" was played. The timer ended when the jug was poured (tilt switch that triggered at an angle of 30◦ ). This procedure was repeated using either the dominant or the non-dominant hand, using LED to indicate correct or distraction cups, and using two different sounds: a "pour me" voice command and the sound of the water pouring. This was done to test the effectiveness of different types of audio prompts. In terms of the 'correct or distraction' using LEDs, when the participant was about to perform an action with an object, another object cued the participant to use it instead. For example, when a participant was about to pour into a cup, the LED on the cup turned red and another cup turned green. This tested whether the cues can stop a current action and change an intention. At the end of the eight tasks in this trial, participants were interviewed to ask about their preference for and interpretation of the different cues that were employed, and were asked to explain what decisions they were making during the tasks.
